{
  "data": [
    {
      "date": "2021-01-01",
      "index": "SR-BASIS-VG",
      "mid": 6,
      "low": 1,
      "high": 11,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-01-01",
      "index": "SR-CFR-CHINA",
      "mid": 162,
      "low": 141,
      "high": 183,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2021/03/31/price-trends-50/",
      "note": "Feb 2021 China spot avg $141/t CFR; high end $183/t.",
      "interpolated": true
    },
    {
      "date": "2021-01-01",
      "index": "SR-GULF-FOB-G",
      "mid": 83,
      "low": 75,
      "high": 91,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends (Argus author)",
      "source_url": "https://www.bcinsight.crugroup.com/2021/01/31/price-trends-46/",
      "note": "US Gulf export prices averaged $83/t FOB in December 2020 entering 2021.",
      "interpolated": false
    },
    {
      "date": "2021-01-01",
      "index": "SR-ME-FOB",
      "mid": 101,
      "low": 93,
      "high": 109,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends (Argus author)",
      "source_url": "https://www.bcinsight.crugroup.com/2021/01/31/price-trends-46/",
      "note": "Muntajat January 2021 QSP $101/t FOB (into three digits). Dec 2020 ME avg ~$93/t.",
      "interpolated": false
    },
    {
      "date": "2021-01-01",
      "index": "SR-TAMPA-Q",
      "mid": 69,
      "low": 61,
      "high": 77,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "Contract sulfur Tampa FL began 2021 at around $69/LT.",
      "interpolated": false
    },
    {
      "date": "2021-01-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-01-01",
      "index": "SR-VAN-FOB-G",
      "mid": 89,
      "low": 81,
      "high": 97,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends (Argus author)",
      "source_url": "https://www.bcinsight.crugroup.com/2021/01/31/price-trends-46/",
      "note": "Vancouver spot average ~$89/t FOB in December 2020 entering 2021 rally.",
      "interpolated": false
    },
    {
      "date": "2021-02-01",
      "index": "SR-BASIS-VG",
      "mid": 5.2,
      "low": 0.20000000000000018,
      "high": 10.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-02-01",
      "index": "SR-CFR-CHINA",
      "mid": 162,
      "low": 141,
      "high": 183,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2021/03/31/price-trends-50/",
      "note": "Feb 2021 China spot avg $141/t CFR; high end $183/t.",
      "interpolated": false
    },
    {
      "date": "2021-02-01",
      "index": "SR-GULF-FOB-G",
      "mid": 95.5,
      "low": 87.5,
      "high": 103.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-02-01",
      "index": "SR-ME-FOB",
      "mid": 144.1,
      "low": 136.1,
      "high": 152.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-03-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-02-01",
      "index": "SR-TAMPA-Q",
      "mid": 89,
      "low": 81,
      "high": 97,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-02-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-02-01",
      "index": "SR-VAN-FOB-G",
      "mid": 100.7,
      "low": 92.7,
      "high": 108.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-03-01",
      "index": "SR-BASIS-VG",
      "mid": 4.5,
      "low": -0.5,
      "high": 9.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-03-01",
      "index": "SR-CFR-CHINA",
      "mid": 200,
      "low": 192,
      "high": 208,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2021/03/31/price-trends-50/",
      "note": "Early March 2021 China granular ~$200/t CFR.",
      "interpolated": false
    },
    {
      "date": "2021-03-01",
      "index": "SR-GULF-FOB-G",
      "mid": 106.8,
      "low": 98.8,
      "high": 114.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-03-01",
      "index": "SR-ME-FOB",
      "mid": 183,
      "low": 175,
      "high": 191,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2021/03/31/price-trends-50/",
      "note": "March 2021 ME producer OSPs $183/t FOB across the board (ADNOC/KPC/Qatar).",
      "interpolated": false
    },
    {
      "date": "2021-03-01",
      "index": "SR-TAMPA-Q",
      "mid": 107.1,
      "low": 99.1,
      "high": 115.1,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-03-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-03-01",
      "index": "SR-VAN-FOB-G",
      "mid": 111.3,
      "low": 103.3,
      "high": 119.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-04-01",
      "index": "SR-BASIS-VG",
      "mid": 3.7,
      "low": -1.2999999999999998,
      "high": 8.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-04-01",
      "index": "SR-CFR-CHINA",
      "mid": 205.3,
      "low": 197.1,
      "high": 213.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-05 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-04-01",
      "index": "SR-GULF-FOB-G",
      "mid": 119.3,
      "low": 111.3,
      "high": 127.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-04-01",
      "index": "SR-ME-FOB",
      "mid": 184.1,
      "low": 176.1,
      "high": 192.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-04-01",
      "index": "SR-TAMPA-Q",
      "mid": 127.2,
      "low": 119.2,
      "high": 135.2,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-04-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-04-01",
      "index": "SR-VAN-FOB-G",
      "mid": 123,
      "low": 115,
      "high": 131,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-05-01",
      "index": "SR-BASIS-VG",
      "mid": 2.8,
      "low": -2.2,
      "high": 7.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-05-01",
      "index": "SR-CFR-CHINA",
      "mid": 211.3,
      "low": 202.8,
      "high": 219.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-05 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-05-01",
      "index": "SR-GULF-FOB-G",
      "mid": 131.5,
      "low": 123.5,
      "high": 139.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-05-01",
      "index": "SR-ME-FOB",
      "mid": 185.1,
      "low": 177.1,
      "high": 193.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-05-01",
      "index": "SR-TAMPA-Q",
      "mid": 146.5,
      "low": 138.5,
      "high": 154.5,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-05-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-05-01",
      "index": "SR-VAN-FOB-G",
      "mid": 134.3,
      "low": 126.3,
      "high": 142.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-06-01",
      "index": "SR-BASIS-VG",
      "mid": 2,
      "low": -3,
      "high": 7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-06-01",
      "index": "SR-CFR-CHINA",
      "mid": 217.4,
      "low": 208.7,
      "high": 226.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-05 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-06-01",
      "index": "SR-GULF-FOB-G",
      "mid": 144,
      "low": 136,
      "high": 152,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-06-01",
      "index": "SR-ME-FOB",
      "mid": 186.1,
      "low": 178.1,
      "high": 194.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-06-01",
      "index": "SR-TAMPA-Q",
      "mid": 166.6,
      "low": 158.6,
      "high": 174.6,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-06-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-06-01",
      "index": "SR-VAN-FOB-G",
      "mid": 146,
      "low": 138,
      "high": 154,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-07-01",
      "index": "SR-BASIS-VG",
      "mid": 1.2,
      "low": -3.8,
      "high": 6.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-07-01",
      "index": "SR-CFR-CHINA",
      "mid": 223.4,
      "low": 214.5,
      "high": 232.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-05 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-07-01",
      "index": "SR-GULF-FOB-G",
      "mid": 156.1,
      "low": 148.1,
      "high": 164.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-07-01",
      "index": "SR-ME-FOB",
      "mid": 187.1,
      "low": 179.1,
      "high": 195.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-07-01",
      "index": "SR-TAMPA-Q",
      "mid": 195,
      "low": 187,
      "high": 203,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "Mid-July 2021 Tampa contract $195/LT (USGS wording: price moved to $195).",
      "interpolated": false
    },
    {
      "date": "2021-07-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-07-01",
      "index": "SR-VAN-FOB-G",
      "mid": 157.3,
      "low": 149.3,
      "high": 165.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-08-01",
      "index": "SR-BASIS-VG",
      "mid": 0.4,
      "low": -4.6,
      "high": 5.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-08-01",
      "index": "SR-CFR-CHINA",
      "mid": 229.5,
      "low": 220.3,
      "high": 238.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-05 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-08-01",
      "index": "SR-GULF-FOB-G",
      "mid": 168.6,
      "low": 160.6,
      "high": 176.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-08-01",
      "index": "SR-ME-FOB",
      "mid": 188.2,
      "low": 180.2,
      "high": 196.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-03-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-08-01",
      "index": "SR-TAMPA-Q",
      "mid": 192.4,
      "low": 184.4,
      "high": 200.4,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-07-15 and 2021-09-30 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-08-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-08-01",
      "index": "SR-VAN-FOB-G",
      "mid": 169,
      "low": 161,
      "high": 177,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-01-01 and 2021-09-23 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-09-01",
      "index": "SR-BASIS-VG",
      "mid": -1,
      "low": -6,
      "high": 4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-09-01",
      "index": "SR-CFR-CHINA",
      "mid": 240,
      "low": 235,
      "high": 245,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/FER-Sample%20Report-Argus%20Sulphur%20%282021-09-23%29.pdf",
      "note": "CFR China granular $235–245/t; all-forms molten-lump-granular $170–245.",
      "interpolated": false
    },
    {
      "date": "2021-09-01",
      "index": "SR-GULF-FOB-G",
      "mid": 190,
      "low": 189,
      "high": 191,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/FER-Sample%20Report-Argus%20Sulphur%20%282021-09-23%29.pdf",
      "note": "Spot FOB US Gulf $189–191/t; 3Q 2021 contract $170–173/t.",
      "interpolated": false
    },
    {
      "date": "2021-09-01",
      "index": "SR-ME-FOB",
      "mid": 190,
      "low": 189,
      "high": 191,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/FER-Sample%20Report-Argus%20Sulphur%20%282021-09-23%29.pdf",
      "note": "Spot FOB Middle East (ex-Iran) $189–191/t; Sep OSPs Qatar 178 / UAE & KPC 180; 4Q talks ~$175–180.",
      "interpolated": false
    },
    {
      "date": "2021-09-01",
      "index": "SR-TAMPA-Q",
      "mid": 183,
      "low": 175,
      "high": 191,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "End-September 2021 Tampa $183/LT; Q4 2021 remained $183/LT.",
      "interpolated": false
    },
    {
      "date": "2021-09-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-09-01",
      "index": "SR-VAN-FOB-G",
      "mid": 189,
      "low": 184,
      "high": 194,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/FER-Sample%20Report-Argus%20Sulphur%20%282021-09-23%29.pdf",
      "note": "Spot/3Q 2021 FOB Vancouver $184–194/t.",
      "interpolated": false
    },
    {
      "date": "2021-10-01",
      "index": "SR-BASIS-VG",
      "mid": -0.7,
      "low": -5.7,
      "high": 4.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-10-01",
      "index": "SR-CFR-CHINA",
      "mid": 244.5,
      "low": 234.7,
      "high": 254.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-10-01",
      "index": "SR-GULF-FOB-G",
      "mid": 199.1,
      "low": 191.1,
      "high": 207.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-10-01",
      "index": "SR-ME-FOB",
      "mid": 185,
      "low": 175,
      "high": 190,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2021/11/30/price-trends-54/",
      "note": "Oct OSP into low $190s; 4Q ME contracts ~$180 FOB (N Africa $175–180).",
      "interpolated": false
    },
    {
      "date": "2021-10-01",
      "index": "SR-TAMPA-Q",
      "mid": 183,
      "low": 175,
      "high": 191,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-30 and 2021-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-10-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-10-01",
      "index": "SR-VAN-FOB-G",
      "mid": 198.4,
      "low": 190.4,
      "high": 206.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-11-01",
      "index": "SR-BASIS-VG",
      "mid": 0.4,
      "low": -4.6,
      "high": 5.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-11-01",
      "index": "SR-CFR-CHINA",
      "mid": 261.9,
      "low": 251.4,
      "high": 272.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-11-01",
      "index": "SR-GULF-FOB-G",
      "mid": 234.6,
      "low": 225.2,
      "high": 244,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-11-01",
      "index": "SR-ME-FOB",
      "mid": 224.2,
      "low": 215.2,
      "high": 233.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-10-01 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-11-01",
      "index": "SR-TAMPA-Q",
      "mid": 183,
      "low": 175,
      "high": 191,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-30 and 2021-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-11-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": true
    },
    {
      "date": "2021-11-01",
      "index": "SR-VAN-FOB-G",
      "mid": 235,
      "low": 225.6,
      "high": 244.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-12-01",
      "index": "SR-BASIS-VG",
      "mid": 1.5,
      "low": -3.5,
      "high": 6.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2021-12-01",
      "index": "SR-CFR-CHINA",
      "mid": 278.7,
      "low": 267.6,
      "high": 289.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-12-01",
      "index": "SR-GULF-FOB-G",
      "mid": 268.9,
      "low": 258.1,
      "high": 279.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-12-01",
      "index": "SR-ME-FOB",
      "mid": 262.2,
      "low": 251.7,
      "high": 272.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-10-01 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2021-12-01",
      "index": "SR-TAMPA-Q",
      "mid": 183,
      "low": 175,
      "high": 191,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "Q4 2021 Tampa held at $183/LT through year-end.",
      "interpolated": false
    },
    {
      "date": "2021-12-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2022 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2022/mcs2022-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2021e ≈ $90/MT (domestic average, not export spot). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": false
    },
    {
      "date": "2021-12-01",
      "index": "SR-VAN-FOB-G",
      "mid": 270.4,
      "low": 259.6,
      "high": 281.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-01-01",
      "index": "SR-BASIS-VG",
      "mid": 2.7,
      "low": -2.3,
      "high": 7.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-01-01",
      "index": "SR-CFR-CHINA",
      "mid": 296.1,
      "low": 284.3,
      "high": 307.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-01-01",
      "index": "SR-GULF-FOB-G",
      "mid": 304.3,
      "low": 292.1,
      "high": 316.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-01-01",
      "index": "SR-ME-FOB",
      "mid": 301.5,
      "low": 289.4,
      "high": 313.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-10-01 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-01-01",
      "index": "SR-TAMPA-Q",
      "mid": 282,
      "low": 270.7,
      "high": 293.3,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2023 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2023/mcs2023-sulfur.pdf",
      "note": "Contract sulfur Tampa began 2022 at around $282/LT.",
      "interpolated": false
    },
    {
      "date": "2022-01-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90.2,
      "low": 82.2,
      "high": 98.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-01-01",
      "index": "SR-VAN-FOB-G",
      "mid": 307,
      "low": 294.7,
      "high": 319.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-02-01",
      "index": "SR-BASIS-VG",
      "mid": 3.8,
      "low": -1.2000000000000002,
      "high": 8.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-02-01",
      "index": "SR-CFR-CHINA",
      "mid": 313.5,
      "low": 301,
      "high": 326,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-02-01",
      "index": "SR-GULF-FOB-G",
      "mid": 339.7,
      "low": 326.1,
      "high": 353.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-02-01",
      "index": "SR-ME-FOB",
      "mid": 340.7,
      "low": 327.1,
      "high": 354.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-10-01 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-02-01",
      "index": "SR-TAMPA-Q",
      "mid": 350.5,
      "low": 336.5,
      "high": 364.5,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-01-01 and 2022-04-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-02-01",
      "index": "SR-US-DOM-AVG",
      "mid": 95.3,
      "low": 87.3,
      "high": 103.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-02-01",
      "index": "SR-VAN-FOB-G",
      "mid": 343.5,
      "low": 329.8,
      "high": 357.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-03-01",
      "index": "SR-BASIS-VG",
      "mid": 4.9,
      "low": -0.09999999999999964,
      "high": 9.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-03-01",
      "index": "SR-CFR-CHINA",
      "mid": 329.2,
      "low": 316,
      "high": 342.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-03-01",
      "index": "SR-GULF-FOB-G",
      "mid": 371.7,
      "low": 356.8,
      "high": 386.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-03-01",
      "index": "SR-ME-FOB",
      "mid": 376.1,
      "low": 361.1,
      "high": 391.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-10-01 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-03-01",
      "index": "SR-TAMPA-Q",
      "mid": 412.5,
      "low": 396,
      "high": 429,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-01-01 and 2022-04-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-03-01",
      "index": "SR-US-DOM-AVG",
      "mid": 99.9,
      "low": 91.9,
      "high": 107.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-03-01",
      "index": "SR-VAN-FOB-G",
      "mid": 376.6,
      "low": 361.5,
      "high": 391.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-04-01",
      "index": "SR-BASIS-VG",
      "mid": 6,
      "low": 1,
      "high": 11,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-04-01",
      "index": "SR-CFR-CHINA",
      "mid": 346.6,
      "low": 332.7,
      "high": 360.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-04-01",
      "index": "SR-GULF-FOB-G",
      "mid": 407.1,
      "low": 390.8,
      "high": 423.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-04-01",
      "index": "SR-ME-FOB",
      "mid": 415.4,
      "low": 398.8,
      "high": 432,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-10-01 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-04-01",
      "index": "SR-TAMPA-Q",
      "mid": 481,
      "low": 461.8,
      "high": 500.2,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2023 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2023/mcs2023-sulfur.pdf",
      "note": "Early April 2022 Tampa peak $481/LT (cycle high; also Argus sample cfr Tampa 2Q 2022).",
      "interpolated": false
    },
    {
      "date": "2022-04-01",
      "index": "SR-US-DOM-AVG",
      "mid": 105,
      "low": 97,
      "high": 113,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-04-01",
      "index": "SR-VAN-FOB-G",
      "mid": 413.1,
      "low": 396.6,
      "high": 429.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-09-23 and 2022-05-26 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-05-01",
      "index": "SR-BASIS-VG",
      "mid": 8,
      "low": 3,
      "high": 13,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-05-01",
      "index": "SR-CFR-CHINA",
      "mid": 377.5,
      "low": 230,
      "high": 525,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/Argus%20Sulphur%20%282022-05-26%29.pdf",
      "note": "Peak-cycle CFR China molten-lump-granular band $230–525/t (mid of published band).",
      "interpolated": false
    },
    {
      "date": "2022-05-01",
      "index": "SR-GULF-FOB-G",
      "mid": 470,
      "low": 469,
      "high": 471,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/Argus%20Sulphur%20%282022-05-26%29.pdf",
      "note": "Peak-cycle spot FOB US Gulf $469–471/t; 2Q 2022 contract $380–381/t.",
      "interpolated": false
    },
    {
      "date": "2022-05-01",
      "index": "SR-ME-FOB",
      "mid": 485,
      "low": 480,
      "high": 490,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/Argus%20Sulphur%20%282022-05-26%29.pdf",
      "note": "Near peak: spot FOB ME (ex-Iran) $480–490/t; May OSPs Qatar 460 / UAE & KPC 470.",
      "interpolated": false
    },
    {
      "date": "2022-05-01",
      "index": "SR-TAMPA-Q",
      "mid": 481,
      "low": 461.8,
      "high": 500.2,
      "currency": "USD",
      "unit": "LT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/Argus%20Sulphur%20%282022-05-26%29.pdf",
      "note": "Public sample confirms cfr Tampa 2Q 2022 $481/LT.",
      "interpolated": false
    },
    {
      "date": "2022-05-01",
      "index": "SR-US-DOM-AVG",
      "mid": 109.9,
      "low": 101.9,
      "high": 117.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-05-01",
      "index": "SR-VAN-FOB-G",
      "mid": 478,
      "low": 476,
      "high": 480,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/Argus%20Sulphur%20%282022-05-26%29.pdf",
      "note": "Near-peak cycle: FOB Vancouver $476–480/t (2Q 2022 sample).",
      "interpolated": false
    },
    {
      "date": "2022-06-01",
      "index": "SR-BASIS-VG",
      "mid": 7.6,
      "low": 2.5999999999999996,
      "high": 12.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-06-01",
      "index": "SR-CFR-CHINA",
      "mid": 340,
      "low": 230,
      "high": 450,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends (citing Argus)",
      "source_url": "https://www.bcinsight.crugroup.com/2022/07/31/price-trends-32/",
      "note": "End-June 2022 China all-forms $230–450/t CFR; averages down ~$63 through June.",
      "interpolated": false
    },
    {
      "date": "2022-06-01",
      "index": "SR-GULF-FOB-G",
      "mid": 466,
      "low": 447.4,
      "high": 484.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-06-01",
      "index": "SR-ME-FOB",
      "mid": 485,
      "low": 465.6,
      "high": 504.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2022/09/30/price-trends-31/",
      "note": "June 2022 cycle high: average ME FOB ~$485/t; Muntajat June QSP $490/t FOB.",
      "interpolated": false
    },
    {
      "date": "2022-06-01",
      "index": "SR-TAMPA-Q",
      "mid": 465.5,
      "low": 446.9,
      "high": 484.1,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2022-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-06-01",
      "index": "SR-US-DOM-AVG",
      "mid": 115,
      "low": 107,
      "high": 123,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-06-01",
      "index": "SR-VAN-FOB-G",
      "mid": 473.6,
      "low": 454.7,
      "high": 492.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-07-01",
      "index": "SR-BASIS-VG",
      "mid": 5.5,
      "low": 0.5,
      "high": 10.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-07-01",
      "index": "SR-CFR-CHINA",
      "mid": 336.2,
      "low": 322.8,
      "high": 349.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-06-30 and 2022-09-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-07-01",
      "index": "SR-GULF-FOB-G",
      "mid": 446.2,
      "low": 428.4,
      "high": 464,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-07-01",
      "index": "SR-ME-FOB",
      "mid": 427.5,
      "low": 427,
      "high": 428,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2022/07/31/price-trends-32/",
      "note": "July OSPs: KPC $427, Qatar QSP $428 FOB (−$62–63 from June).",
      "interpolated": false
    },
    {
      "date": "2022-07-01",
      "index": "SR-TAMPA-Q",
      "mid": 352,
      "low": 337.9,
      "high": 366.1,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2023 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2023/mcs2023-sulfur.pdf",
      "note": "Mid-July 2022 Tampa $352/LT after peak.",
      "interpolated": false
    },
    {
      "date": "2022-07-01",
      "index": "SR-US-DOM-AVG",
      "mid": 119.9,
      "low": 111.9,
      "high": 127.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-07-01",
      "index": "SR-VAN-FOB-G",
      "mid": 451.7,
      "low": 433.6,
      "high": 469.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-08-01",
      "index": "SR-BASIS-VG",
      "mid": 3.3,
      "low": -1.7000000000000002,
      "high": 8.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-08-01",
      "index": "SR-CFR-CHINA",
      "mid": 216.8,
      "low": 208.1,
      "high": 225.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-06-30 and 2022-09-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-08-01",
      "index": "SR-GULF-FOB-G",
      "mid": 425.8,
      "low": 408.8,
      "high": 442.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-08-01",
      "index": "SR-ME-FOB",
      "mid": 71,
      "low": 63,
      "high": 79,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2022/09/30/price-trends-31/",
      "note": "Crash floor: average ME FOB ~$71/t at start of August 2022.",
      "interpolated": false
    },
    {
      "date": "2022-08-01",
      "index": "SR-TAMPA-Q",
      "mid": 294.9,
      "low": 283.1,
      "high": 306.7,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-07-15 and 2022-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-08-01",
      "index": "SR-US-DOM-AVG",
      "mid": 125,
      "low": 117,
      "high": 133,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-08-01",
      "index": "SR-VAN-FOB-G",
      "mid": 429.1,
      "low": 411.9,
      "high": 446.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-09-01",
      "index": "SR-BASIS-VG",
      "mid": 1.1,
      "low": -3.9,
      "high": 6.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-09-01",
      "index": "SR-CFR-CHINA",
      "mid": 97.5,
      "low": 55,
      "high": 140,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends (citing Argus)",
      "source_url": "https://www.bcinsight.crugroup.com/2022/09/30/price-trends-31/",
      "note": "Early Sep 2022 China all-forms $55–140/t CFR (molten low / granular high).",
      "interpolated": false
    },
    {
      "date": "2022-09-01",
      "index": "SR-GULF-FOB-G",
      "mid": 405.3,
      "low": 389.1,
      "high": 421.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-09-01",
      "index": "SR-ME-FOB",
      "mid": 92,
      "low": 89,
      "high": 95,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2022/09/30/price-trends-31/",
      "note": "Sep OSPs: KPC $95, Qatar $89, ADNOC $92; early-Sep ME avg ~$92 FOB.",
      "interpolated": false
    },
    {
      "date": "2022-09-01",
      "index": "SR-TAMPA-Q",
      "mid": 190.8,
      "low": 182.8,
      "high": 198.8,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-07-15 and 2022-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-09-01",
      "index": "SR-US-DOM-AVG",
      "mid": 130.1,
      "low": 122.1,
      "high": 138.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-09-01",
      "index": "SR-VAN-FOB-G",
      "mid": 406.4,
      "low": 390.1,
      "high": 422.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-10-01",
      "index": "SR-BASIS-VG",
      "mid": -1,
      "low": -6,
      "high": 4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-10-01",
      "index": "SR-CFR-CHINA",
      "mid": 105.6,
      "low": 97.6,
      "high": 113.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-09-01 and 2023-01-05 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-10-01",
      "index": "SR-GULF-FOB-G",
      "mid": 385.5,
      "low": 370.1,
      "high": 400.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-10-01",
      "index": "SR-ME-FOB",
      "mid": 105.9,
      "low": 97.9,
      "high": 113.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-09-01 and 2023-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-10-01",
      "index": "SR-TAMPA-Q",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2023 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2023/mcs2023-sulfur.pdf",
      "note": "Q4 2022 Tampa $90/LT after summer crash.",
      "interpolated": false
    },
    {
      "date": "2022-10-01",
      "index": "SR-US-DOM-AVG",
      "mid": 135,
      "low": 127,
      "high": 143,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-10-01",
      "index": "SR-VAN-FOB-G",
      "mid": 384.5,
      "low": 369.1,
      "high": 399.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-11-01",
      "index": "SR-BASIS-VG",
      "mid": -3.2,
      "low": -8.2,
      "high": 1.7999999999999998,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-11-01",
      "index": "SR-CFR-CHINA",
      "mid": 114,
      "low": 106,
      "high": 122,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-09-01 and 2023-01-05 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-11-01",
      "index": "SR-GULF-FOB-G",
      "mid": 365.1,
      "low": 350.5,
      "high": 379.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-11-01",
      "index": "SR-ME-FOB",
      "mid": 120.3,
      "low": 112.3,
      "high": 128.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-09-01 and 2023-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-11-01",
      "index": "SR-TAMPA-Q",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-10-01 and 2023-01-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-11-01",
      "index": "SR-US-DOM-AVG",
      "mid": 140.1,
      "low": 132.1,
      "high": 148.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2021-12-31 and 2022-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-11-01",
      "index": "SR-VAN-FOB-G",
      "mid": 361.9,
      "low": 347.4,
      "high": 376.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-12-01",
      "index": "SR-BASIS-VG",
      "mid": -5.4,
      "low": -10.4,
      "high": -0.40000000000000036,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2022-12-01",
      "index": "SR-CFR-CHINA",
      "mid": 122.1,
      "low": 114.1,
      "high": 130.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-09-01 and 2023-01-05 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-12-01",
      "index": "SR-GULF-FOB-G",
      "mid": 345.3,
      "low": 331.5,
      "high": 359.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-12-01",
      "index": "SR-ME-FOB",
      "mid": 134.2,
      "low": 126.2,
      "high": 142.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-09-01 and 2023-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-12-01",
      "index": "SR-TAMPA-Q",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-10-01 and 2023-01-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2022-12-01",
      "index": "SR-US-DOM-AVG",
      "mid": 150,
      "low": 142,
      "high": 158,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2023 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2023/mcs2023-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2022e ≈ $150/MT (domestic average). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": false
    },
    {
      "date": "2022-12-01",
      "index": "SR-VAN-FOB-G",
      "mid": 339.9,
      "low": 326.3,
      "high": 353.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-01-01",
      "index": "SR-BASIS-VG",
      "mid": -7.5,
      "low": -12.5,
      "high": -2.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-01-01",
      "index": "SR-CFR-CHINA",
      "mid": 131.5,
      "low": 90,
      "high": 173,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends (citing Argus)",
      "source_url": "https://www.bcinsight.crugroup.com/2023/01/31/price-trends-15/",
      "note": "Early Jan 2023 China all-forms spot $90–173/t CFR.",
      "interpolated": false
    },
    {
      "date": "2023-01-01",
      "index": "SR-GULF-FOB-G",
      "mid": 324.8,
      "low": 311.8,
      "high": 337.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-01-01",
      "index": "SR-ME-FOB",
      "mid": 155,
      "low": 154,
      "high": 160,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2023/01/31/price-trends-15/",
      "note": "Mid-Jan 2023 ME avg ~$155 FOB; OSPs KPC 154 / Qatar 155 / ADNOC 160. Q1 contracts ~$140–155.",
      "interpolated": false
    },
    {
      "date": "2023-01-01",
      "index": "SR-TAMPA-Q",
      "mid": 90,
      "low": 82,
      "high": 98,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2024 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2024/mcs2024-sulfur.pdf",
      "note": "Tampa began 2023 at around $90/LT.",
      "interpolated": false
    },
    {
      "date": "2023-01-01",
      "index": "SR-US-DOM-AVG",
      "mid": 149.8,
      "low": 141.8,
      "high": 157.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-01-01",
      "index": "SR-VAN-FOB-G",
      "mid": 317.3,
      "low": 304.6,
      "high": 330,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-02-01",
      "index": "SR-BASIS-VG",
      "mid": -9.8,
      "low": -14.8,
      "high": -4.800000000000001,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-02-01",
      "index": "SR-CFR-CHINA",
      "mid": 127.5,
      "low": 119.5,
      "high": 135.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-05 and 2023-05-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-02-01",
      "index": "SR-GULF-FOB-G",
      "mid": 304.4,
      "low": 292.2,
      "high": 316.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-02-01",
      "index": "SR-ME-FOB",
      "mid": 149,
      "low": 141,
      "high": 157,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-15 and 2023-03-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-02-01",
      "index": "SR-TAMPA-Q",
      "mid": 84.4,
      "low": 76.4,
      "high": 92.4,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-01 and 2023-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-02-01",
      "index": "SR-US-DOM-AVG",
      "mid": 142,
      "low": 134,
      "high": 150,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-02-01",
      "index": "SR-VAN-FOB-G",
      "mid": 294.6,
      "low": 282.8,
      "high": 306.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-03-01",
      "index": "SR-BASIS-VG",
      "mid": -11.7,
      "low": -16.7,
      "high": -6.699999999999999,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-03-01",
      "index": "SR-CFR-CHINA",
      "mid": 123.4,
      "low": 115.4,
      "high": 131.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-05 and 2023-05-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-03-01",
      "index": "SR-GULF-FOB-G",
      "mid": 285.9,
      "low": 274.5,
      "high": 297.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-03-01",
      "index": "SR-ME-FOB",
      "mid": 134.3,
      "low": 133,
      "high": 136,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2023/03/31/price-trends-16/",
      "note": "March OSPs: Qatar $133, KPC $136, ADNOC $134 FOB; Q1 avg down to ~$135.",
      "interpolated": false
    },
    {
      "date": "2023-03-01",
      "index": "SR-TAMPA-Q",
      "mid": 79.4,
      "low": 71.4,
      "high": 87.4,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-01 and 2023-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-03-01",
      "index": "SR-US-DOM-AVG",
      "mid": 135,
      "low": 127,
      "high": 143,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-03-01",
      "index": "SR-VAN-FOB-G",
      "mid": 274.2,
      "low": 263.2,
      "high": 285.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-04-01",
      "index": "SR-BASIS-VG",
      "mid": -13.8,
      "low": -18.8,
      "high": -8.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-04-01",
      "index": "SR-CFR-CHINA",
      "mid": 118.9,
      "low": 110.9,
      "high": 126.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-05 and 2023-05-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-04-01",
      "index": "SR-GULF-FOB-G",
      "mid": 265.4,
      "low": 254.8,
      "high": 276,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-04-01",
      "index": "SR-ME-FOB",
      "mid": 111.3,
      "low": 109,
      "high": 115,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2023/05/31/price-trends-17/",
      "note": "April OSPs: Qatar QSP $110, KPC $109, ADNOC $115 FOB.",
      "interpolated": false
    },
    {
      "date": "2023-04-01",
      "index": "SR-TAMPA-Q",
      "mid": 73.8,
      "low": 65.8,
      "high": 81.8,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-01 and 2023-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-04-01",
      "index": "SR-US-DOM-AVG",
      "mid": 127.3,
      "low": 119.3,
      "high": 135.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-04-01",
      "index": "SR-VAN-FOB-G",
      "mid": 251.6,
      "low": 241.5,
      "high": 261.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-05-01",
      "index": "SR-BASIS-VG",
      "mid": -16.1,
      "low": -21.1,
      "high": -11.100000000000001,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-05-01",
      "index": "SR-CFR-CHINA",
      "mid": 114.5,
      "low": 112,
      "high": 117,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "BC Insight Price Trends (QSP + freight implication)",
      "source_url": "https://www.bcinsight.crugroup.com/2023/05/31/price-trends-17/",
      "note": "May 2023 Qatar QSP $86 implies China ~$112–117/t CFR.",
      "interpolated": false
    },
    {
      "date": "2023-05-01",
      "index": "SR-GULF-FOB-G",
      "mid": 245.7,
      "low": 235.9,
      "high": 255.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-05-01",
      "index": "SR-ME-FOB",
      "mid": 86,
      "low": 78,
      "high": 94,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2023/05/31/price-trends-17/",
      "note": "May 2023 Qatar QSP $86/t FOB (implies China CFR ~$112–117 at then freights).",
      "interpolated": false
    },
    {
      "date": "2023-05-01",
      "index": "SR-TAMPA-Q",
      "mid": 68.5,
      "low": 60.5,
      "high": 76.5,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-01 and 2023-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-05-01",
      "index": "SR-US-DOM-AVG",
      "mid": 119.8,
      "low": 111.8,
      "high": 127.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-05-01",
      "index": "SR-VAN-FOB-G",
      "mid": 229.6,
      "low": 220.4,
      "high": 238.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-06-01",
      "index": "SR-BASIS-VG",
      "mid": -18.2,
      "low": -23.2,
      "high": -13.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-06-01",
      "index": "SR-CFR-CHINA",
      "mid": 108.5,
      "low": 100.5,
      "high": 116.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-06-01",
      "index": "SR-GULF-FOB-G",
      "mid": 225.2,
      "low": 216.2,
      "high": 234.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-06-01",
      "index": "SR-ME-FOB",
      "mid": 87.7,
      "low": 79.7,
      "high": 95.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-06-01",
      "index": "SR-TAMPA-Q",
      "mid": 62.9,
      "low": 54.9,
      "high": 70.9,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-01-01 and 2023-07-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-06-01",
      "index": "SR-US-DOM-AVG",
      "mid": 112.1,
      "low": 104.1,
      "high": 120.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-06-01",
      "index": "SR-VAN-FOB-G",
      "mid": 207,
      "low": 198.7,
      "high": 215.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-07-01",
      "index": "SR-BASIS-VG",
      "mid": -20.3,
      "low": -25.3,
      "high": -15.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-07-01",
      "index": "SR-CFR-CHINA",
      "mid": 102.6,
      "low": 94.6,
      "high": 110.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-07-01",
      "index": "SR-GULF-FOB-G",
      "mid": 205.4,
      "low": 197.2,
      "high": 213.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-07-01",
      "index": "SR-ME-FOB",
      "mid": 89.4,
      "low": 81.4,
      "high": 97.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-07-01",
      "index": "SR-TAMPA-Q",
      "mid": 55,
      "low": 47,
      "high": 63,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2024 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2024/mcs2024-sulfur.pdf",
      "note": "Mid-July 2023 Tampa soft-cycle low $55/LT.",
      "interpolated": false
    },
    {
      "date": "2023-07-01",
      "index": "SR-US-DOM-AVG",
      "mid": 104.6,
      "low": 96.6,
      "high": 112.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-07-01",
      "index": "SR-VAN-FOB-G",
      "mid": 185.1,
      "low": 177.1,
      "high": 193.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-08-01",
      "index": "SR-BASIS-VG",
      "mid": -22.5,
      "low": -27.5,
      "high": -17.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-08-01",
      "index": "SR-CFR-CHINA",
      "mid": 96.6,
      "low": 88.6,
      "high": 104.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-08-01",
      "index": "SR-GULF-FOB-G",
      "mid": 184.9,
      "low": 176.9,
      "high": 192.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-08-01",
      "index": "SR-ME-FOB",
      "mid": 91.1,
      "low": 83.1,
      "high": 99.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-08-01",
      "index": "SR-TAMPA-Q",
      "mid": 65.2,
      "low": 57.2,
      "high": 73.2,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-07-15 and 2023-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-08-01",
      "index": "SR-US-DOM-AVG",
      "mid": 96.8,
      "low": 88.8,
      "high": 104.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-08-01",
      "index": "SR-VAN-FOB-G",
      "mid": 162.4,
      "low": 154.4,
      "high": 170.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-09-01",
      "index": "SR-BASIS-VG",
      "mid": -24.7,
      "low": -29.7,
      "high": -19.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-09-01",
      "index": "SR-CFR-CHINA",
      "mid": 90.6,
      "low": 82.6,
      "high": 98.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-09-01",
      "index": "SR-GULF-FOB-G",
      "mid": 164.5,
      "low": 156.5,
      "high": 172.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-09-01",
      "index": "SR-ME-FOB",
      "mid": 92.8,
      "low": 84.8,
      "high": 100.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-09-01",
      "index": "SR-TAMPA-Q",
      "mid": 83.9,
      "low": 75.9,
      "high": 91.9,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-07-15 and 2023-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-09-01",
      "index": "SR-US-DOM-AVG",
      "mid": 89.1,
      "low": 81.1,
      "high": 97.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-09-01",
      "index": "SR-VAN-FOB-G",
      "mid": 139.8,
      "low": 131.8,
      "high": 147.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-10-01",
      "index": "SR-BASIS-VG",
      "mid": -26.8,
      "low": -31.8,
      "high": -21.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-10-01",
      "index": "SR-CFR-CHINA",
      "mid": 84.8,
      "low": 76.8,
      "high": 92.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-10-01",
      "index": "SR-GULF-FOB-G",
      "mid": 144.7,
      "low": 136.7,
      "high": 152.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-10-01",
      "index": "SR-ME-FOB",
      "mid": 94.5,
      "low": 86.5,
      "high": 102.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-05-01 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-10-01",
      "index": "SR-TAMPA-Q",
      "mid": 102,
      "low": 94,
      "high": 110,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2024 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2024/mcs2024-sulfur.pdf",
      "note": "Q4 2023 Tampa $102/LT.",
      "interpolated": false
    },
    {
      "date": "2023-10-01",
      "index": "SR-US-DOM-AVG",
      "mid": 81.6,
      "low": 73.6,
      "high": 89.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-10-01",
      "index": "SR-VAN-FOB-G",
      "mid": 117.9,
      "low": 109.9,
      "high": 125.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-05-26 and 2023-11-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-11-01",
      "index": "SR-BASIS-VG",
      "mid": -30,
      "low": -35,
      "high": -25,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-11-01",
      "index": "SR-CFR-CHINA",
      "mid": 76,
      "low": 40,
      "high": 112,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Monthly Sulphur Outlook (public sample PDF)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/FER-Sample-Report-Argus-Monthly-Sulphur-Outlook-%282023-11-23%29.pdf?version=0",
      "note": "November 2023 avg China CFR $40–112/t (all-forms soft-market band).",
      "interpolated": false
    },
    {
      "date": "2023-11-01",
      "index": "SR-GULF-FOB-G",
      "mid": 115,
      "low": 107,
      "high": 123,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Monthly Sulphur Outlook (public sample PDF)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/FER-Sample-Report-Argus-Monthly-Sulphur-Outlook-%282023-11-23%29.pdf?version=0",
      "note": "Q4 2023 US Gulf spot ceiling around $115/t FOB cited in outlook narrative.",
      "interpolated": false
    },
    {
      "date": "2023-11-01",
      "index": "SR-ME-FOB",
      "mid": 97,
      "low": 95,
      "high": 99,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Monthly Sulphur Outlook (public sample PDF)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/FER-Sample-Report-Argus-Monthly-Sulphur-Outlook-%282023-11-23%29.pdf?version=0",
      "note": "November 2023 avg FOB Middle East $95–99/t.",
      "interpolated": false
    },
    {
      "date": "2023-11-01",
      "index": "SR-TAMPA-Q",
      "mid": 90.9,
      "low": 82.9,
      "high": 98.9,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-10-01 and 2024-01-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-11-01",
      "index": "SR-US-DOM-AVG",
      "mid": 73.9,
      "low": 65.9,
      "high": 81.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2022-12-31 and 2023-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-11-01",
      "index": "SR-VAN-FOB-G",
      "mid": 85,
      "low": 84,
      "high": 86,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Monthly Sulphur Outlook (public sample PDF)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/FER-Sample-Report-Argus-Monthly-Sulphur-Outlook-%282023-11-23%29.pdf?version=0",
      "note": "November 2023 avg FOB Vancouver $84–86/t (soft market).",
      "interpolated": false
    },
    {
      "date": "2023-12-01",
      "index": "SR-BASIS-VG",
      "mid": -29.9,
      "low": -34.9,
      "high": -24.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2023-12-01",
      "index": "SR-CFR-CHINA",
      "mid": 79.7,
      "low": 71.7,
      "high": 87.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-11-15 and 2024-02-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-12-01",
      "index": "SR-GULF-FOB-G",
      "mid": 101.9,
      "low": 93.9,
      "high": 109.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-11-15 and 2024-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-12-01",
      "index": "SR-ME-FOB",
      "mid": 94.6,
      "low": 86.6,
      "high": 102.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-11-15 and 2024-02-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-12-01",
      "index": "SR-TAMPA-Q",
      "mid": 80.1,
      "low": 72.1,
      "high": 88.1,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-10-01 and 2024-01-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2023-12-01",
      "index": "SR-US-DOM-AVG",
      "mid": 58.9,
      "low": 50.9,
      "high": 66.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2025 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2025/mcs2025-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2023 = $58.90/MT (soft domestic average). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": false
    },
    {
      "date": "2023-12-01",
      "index": "SR-VAN-FOB-G",
      "mid": 72,
      "low": 64,
      "high": 80,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "Argus Media open news — Viewpoint: Global softness to pressure NorthAm sulfur",
      "source_url": "https://www.argusmedia.com/en/news-and-insights/latest-market-news/2523114-viewpoint-global-softness-to-pressure-northam-sulfur",
      "note": "Vancouver FOB midpoint $72/t on 14 Dec 2023 (−25% since start of Q4 2023).",
      "interpolated": false
    },
    {
      "date": "2024-01-01",
      "index": "SR-BASIS-VG",
      "mid": 9.2,
      "low": 4.199999999999999,
      "high": 14.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-01-01",
      "index": "SR-CFR-CHINA",
      "mid": 86.7,
      "low": 78.7,
      "high": 94.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-11-15 and 2024-02-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-01-01",
      "index": "SR-GULF-FOB-G",
      "mid": 65,
      "low": 60,
      "high": 69,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/03/31/price-trends-7/",
      "note": "January 2024 US Gulf sales concluded in the $60s/t FOB as export availability was long.",
      "interpolated": false
    },
    {
      "date": "2024-01-01",
      "index": "SR-ME-FOB",
      "mid": 89.8,
      "low": 81.8,
      "high": 97.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-11-15 and 2024-02-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-01-01",
      "index": "SR-TAMPA-Q",
      "mid": 69,
      "low": 61,
      "high": 77,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2025 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2025/mcs2025-sulfur.pdf",
      "note": "Contract sulfur Tampa began 2024 at $69/LT (−$33 from Q4 2023 per BC Insight).",
      "interpolated": false
    },
    {
      "date": "2024-01-01",
      "index": "SR-US-DOM-AVG",
      "mid": 58.9,
      "low": 50.9,
      "high": 66.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-01-01",
      "index": "SR-VAN-FOB-G",
      "mid": 74.2,
      "low": 66.2,
      "high": 82.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-14 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-02-01",
      "index": "SR-BASIS-VG",
      "mid": 10.9,
      "low": 5.9,
      "high": 15.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-02-01",
      "index": "SR-CFR-CHINA",
      "mid": 97,
      "low": 89,
      "high": 105,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/03/31/price-trends-7/",
      "note": "CMOC 5 Feb 2024 tender indicated upper $90s/t CFR (FSU supply).",
      "interpolated": false
    },
    {
      "date": "2024-02-01",
      "index": "SR-GULF-FOB-G",
      "mid": 67.1,
      "low": 59.1,
      "high": 75.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-01-15 and 2024-03-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-02-01",
      "index": "SR-ME-FOB",
      "mid": 83,
      "low": 80,
      "high": 86,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/09/30/price-trends-59/",
      "note": "Feb 2024 Muntajat tender awards indicated low $80s/t FOB (soft trough).",
      "interpolated": false
    },
    {
      "date": "2024-02-01",
      "index": "SR-TAMPA-Q",
      "mid": 75.2,
      "low": 67.2,
      "high": 83.2,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-01-01 and 2024-03-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-02-01",
      "index": "SR-US-DOM-AVG",
      "mid": 57.8,
      "low": 49.8,
      "high": 65.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-02-01",
      "index": "SR-VAN-FOB-G",
      "mid": 78,
      "low": 70,
      "high": 86,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-14 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-03-01",
      "index": "SR-BASIS-VG",
      "mid": 9.1,
      "low": 4.1,
      "high": 14.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-03-01",
      "index": "SR-CFR-CHINA",
      "mid": 102,
      "low": 97,
      "high": 107,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/03/31/price-trends-7/",
      "note": "Post-LNY 2024 China CFR $97–107/t (soft recovery from Feb lows).",
      "interpolated": false
    },
    {
      "date": "2024-03-01",
      "index": "SR-GULF-FOB-G",
      "mid": 72.5,
      "low": 70,
      "high": 75,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/03/31/price-trends-7/",
      "note": "Spot US Gulf assessed $70–75/t FOB (up from $65–70).",
      "interpolated": false
    },
    {
      "date": "2024-03-01",
      "index": "SR-ME-FOB",
      "mid": 83.2,
      "low": 75.2,
      "high": 91.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-02-15 and 2024-06-25 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-03-01",
      "index": "SR-TAMPA-Q",
      "mid": 81,
      "low": 73,
      "high": 89,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2025 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2025/mcs2025-sulfur.pdf",
      "note": "Early March 2024 Tampa $81/LT.",
      "interpolated": false
    },
    {
      "date": "2024-03-01",
      "index": "SR-US-DOM-AVG",
      "mid": 56.8,
      "low": 48.8,
      "high": 64.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-03-01",
      "index": "SR-VAN-FOB-G",
      "mid": 81.6,
      "low": 73.6,
      "high": 89.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-14 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-04-01",
      "index": "SR-BASIS-VG",
      "mid": 9.6,
      "low": 4.6,
      "high": 14.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-04-01",
      "index": "SR-CFR-CHINA",
      "mid": 106.3,
      "low": 98.3,
      "high": 114.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-03-15 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-04-01",
      "index": "SR-GULF-FOB-G",
      "mid": 75.8,
      "low": 67.8,
      "high": 83.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-03-15 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-04-01",
      "index": "SR-ME-FOB",
      "mid": 83.7,
      "low": 75.7,
      "high": 91.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-02-15 and 2024-06-25 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-04-01",
      "index": "SR-TAMPA-Q",
      "mid": 81,
      "low": 73,
      "high": 89,
      "currency": "USD",
      "unit": "LT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends (citing Q2 2024 Tampa settlement)",
      "source_url": "https://www.bcinsight.crugroup.com/2025/01/31/price-trends-60/",
      "note": "Q2 2024 Tampa published at $81/LT f.o.b.",
      "interpolated": false
    },
    {
      "date": "2024-04-01",
      "index": "SR-US-DOM-AVG",
      "mid": 55.8,
      "low": 47.8,
      "high": 63.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-04-01",
      "index": "SR-VAN-FOB-G",
      "mid": 85.4,
      "low": 77.4,
      "high": 93.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-14 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-05-01",
      "index": "SR-BASIS-VG",
      "mid": 7.5,
      "low": 2.5,
      "high": 12.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-05-01",
      "index": "SR-CFR-CHINA",
      "mid": 114,
      "low": 106,
      "high": 122,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-03-15 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-05-01",
      "index": "SR-GULF-FOB-G",
      "mid": 81.5,
      "low": 73.5,
      "high": 89.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-03-15 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-05-01",
      "index": "SR-ME-FOB",
      "mid": 84.2,
      "low": 76.2,
      "high": 92.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-02-15 and 2024-06-25 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-05-01",
      "index": "SR-TAMPA-Q",
      "mid": 79.4,
      "low": 71.4,
      "high": 87.4,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-04-01 and 2024-07-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-05-01",
      "index": "SR-US-DOM-AVG",
      "mid": 54.7,
      "low": 46.7,
      "high": 62.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-05-01",
      "index": "SR-VAN-FOB-G",
      "mid": 89,
      "low": 81,
      "high": 97,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-14 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-06-01",
      "index": "SR-BASIS-VG",
      "mid": 5.3,
      "low": 0.2999999999999998,
      "high": 10.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-06-01",
      "index": "SR-CFR-CHINA",
      "mid": 121.8,
      "low": 113.8,
      "high": 129.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-03-15 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-06-01",
      "index": "SR-GULF-FOB-G",
      "mid": 87.5,
      "low": 79.5,
      "high": 95.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-03-15 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-06-01",
      "index": "SR-ME-FOB",
      "mid": 85,
      "low": 77,
      "high": 93,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/09/30/price-trends-59/",
      "note": "Muntajat 25 Jun 2024 session indicated awarded mid-$80s/t FOB.",
      "interpolated": false
    },
    {
      "date": "2024-06-01",
      "index": "SR-TAMPA-Q",
      "mid": 77.6,
      "low": 69.6,
      "high": 85.6,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-04-01 and 2024-07-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-06-01",
      "index": "SR-US-DOM-AVG",
      "mid": 53.7,
      "low": 45.7,
      "high": 61.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-06-01",
      "index": "SR-VAN-FOB-G",
      "mid": 92.8,
      "low": 84.8,
      "high": 100.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-14 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-07-01",
      "index": "SR-BASIS-VG",
      "mid": 3.2,
      "low": -1.7999999999999998,
      "high": 8.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-07-01",
      "index": "SR-CFR-CHINA",
      "mid": 129.5,
      "low": 121.5,
      "high": 137.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-03-15 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-07-01",
      "index": "SR-GULF-FOB-G",
      "mid": 93.3,
      "low": 85.3,
      "high": 101.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-03-15 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-07-01",
      "index": "SR-ME-FOB",
      "mid": 88.4,
      "low": 80.4,
      "high": 96.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-06-25 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-07-01",
      "index": "SR-TAMPA-Q",
      "mid": 76,
      "low": 68,
      "high": 84,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2025 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2025/mcs2025-sulfur.pdf",
      "note": "Early July 2024 Tampa $76/LT.",
      "interpolated": false
    },
    {
      "date": "2024-07-01",
      "index": "SR-US-DOM-AVG",
      "mid": 52.7,
      "low": 44.7,
      "high": 60.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-07-01",
      "index": "SR-VAN-FOB-G",
      "mid": 96.5,
      "low": 88.5,
      "high": 104.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-14 and 2024-08-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-08-01",
      "index": "SR-BASIS-VG",
      "mid": -1,
      "low": -6,
      "high": 4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-08-01",
      "index": "SR-CFR-CHINA",
      "mid": 145,
      "low": 137,
      "high": 153,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/09/30/price-trends-59/",
      "note": "Canadian sulphur sold around $145/t CFR China; China/Indonesia ~$140–145.",
      "interpolated": false
    },
    {
      "date": "2024-08-01",
      "index": "SR-GULF-FOB-G",
      "mid": 105,
      "low": 100,
      "high": 110,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/09/30/price-trends-59/",
      "note": "End-Aug 2024 US Gulf spot $100–110/t FOB (up from $95–100).",
      "interpolated": false
    },
    {
      "date": "2024-08-01",
      "index": "SR-ME-FOB",
      "mid": 122.5,
      "low": 120,
      "high": 125,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/09/30/price-trends-59/",
      "note": "ME spot assessment $120–125/t FOB end-Aug 2024; Sep QSP $125; KPC tenders high $120s.",
      "interpolated": false
    },
    {
      "date": "2024-08-01",
      "index": "SR-TAMPA-Q",
      "mid": 89.5,
      "low": 81.5,
      "high": 97.5,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-07-01 and 2024-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-08-01",
      "index": "SR-US-DOM-AVG",
      "mid": 51.6,
      "low": 43.6,
      "high": 59.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-08-01",
      "index": "SR-VAN-FOB-G",
      "mid": 104,
      "low": 102,
      "high": 106,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/09/30/price-trends-59/",
      "note": "End-Aug 2024 seaborne Canada $102–106/t FOB Vancouver.",
      "interpolated": false
    },
    {
      "date": "2024-09-01",
      "index": "SR-BASIS-VG",
      "mid": 4,
      "low": -1,
      "high": 9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-09-01",
      "index": "SR-CFR-CHINA",
      "mid": 145.3,
      "low": 137.3,
      "high": 153.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-09-01",
      "index": "SR-GULF-FOB-G",
      "mid": 105.5,
      "low": 97.5,
      "high": 113.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-09-01",
      "index": "SR-ME-FOB",
      "mid": 125,
      "low": 117,
      "high": 133,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2024/09/30/price-trends-59/",
      "note": "Muntajat September 2024 QSP $125/t FOB (highest since Mar 2023 $133).",
      "interpolated": false
    },
    {
      "date": "2024-09-01",
      "index": "SR-TAMPA-Q",
      "mid": 103,
      "low": 95,
      "high": 111,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-07-01 and 2024-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-09-01",
      "index": "SR-US-DOM-AVG",
      "mid": 50.5,
      "low": 42.5,
      "high": 58.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-09-01",
      "index": "SR-VAN-FOB-G",
      "mid": 109.5,
      "low": 101.5,
      "high": 117.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2024-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-10-01",
      "index": "SR-BASIS-VG",
      "mid": 154.9,
      "low": 149.9,
      "high": 159.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-10-01",
      "index": "SR-CFR-CHINA",
      "mid": 153.8,
      "low": 145.8,
      "high": 161.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-10-01",
      "index": "SR-GULF-FOB-G",
      "mid": 120.1,
      "low": 112.1,
      "high": 128.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-10-01",
      "index": "SR-ME-FOB",
      "mid": 295,
      "low": 283.2,
      "high": 306.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "CRU / BC Insight — The sulphur market in deficit",
      "source_url": "https://www.bcinsight.crugroup.com/2026/01/28/the-sulphur-market-in-deficit/",
      "note": "Middle East FOB rose from ~$295/t in 2024 Q4 (CRU narrative).",
      "interpolated": false
    },
    {
      "date": "2024-10-01",
      "index": "SR-TAMPA-Q",
      "mid": 116,
      "low": 108,
      "high": 124,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2025 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2025/mcs2025-sulfur.pdf",
      "note": "Q4 2024 Tampa $116/LT.",
      "interpolated": false
    },
    {
      "date": "2024-10-01",
      "index": "SR-US-DOM-AVG",
      "mid": 49.5,
      "low": 41.5,
      "high": 57.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-10-01",
      "index": "SR-VAN-FOB-G",
      "mid": 275,
      "low": 264,
      "high": 286,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "CRU / BC Insight — The sulphur market in deficit",
      "source_url": "https://www.bcinsight.crugroup.com/2026/01/28/the-sulphur-market-in-deficit/",
      "note": "Vancouver FOB ~$275/t in 2024 Q4 (CRU narrative baseline before 2025 rally).",
      "interpolated": false
    },
    {
      "date": "2024-11-01",
      "index": "SR-BASIS-VG",
      "mid": 133.9,
      "low": 128.9,
      "high": 138.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-11-01",
      "index": "SR-CFR-CHINA",
      "mid": 162.6,
      "low": 154.6,
      "high": 170.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-11-01",
      "index": "SR-GULF-FOB-G",
      "mid": 135.2,
      "low": 127.2,
      "high": 143.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-11-01",
      "index": "SR-ME-FOB",
      "mid": 247.8,
      "low": 237.9,
      "high": 257.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-01-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-11-01",
      "index": "SR-TAMPA-Q",
      "mid": 116,
      "low": 108,
      "high": 124,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-01-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-11-01",
      "index": "SR-US-DOM-AVG",
      "mid": 48.5,
      "low": 40.5,
      "high": 56.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2023-12-31 and 2024-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-11-01",
      "index": "SR-VAN-FOB-G",
      "mid": 269.1,
      "low": 258.3,
      "high": 279.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-04-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-12-01",
      "index": "SR-BASIS-VG",
      "mid": 113.7,
      "low": 108.7,
      "high": 118.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2024-12-01",
      "index": "SR-CFR-CHINA",
      "mid": 171.2,
      "low": 163.2,
      "high": 179.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-12-01",
      "index": "SR-GULF-FOB-G",
      "mid": 149.8,
      "low": 141.8,
      "high": 157.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-12-01",
      "index": "SR-ME-FOB",
      "mid": 202.2,
      "low": 194.1,
      "high": 210.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-01-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-12-01",
      "index": "SR-TAMPA-Q",
      "mid": 116,
      "low": 108,
      "high": 124,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-01-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2024-12-01",
      "index": "SR-US-DOM-AVG",
      "mid": 46.42,
      "low": 38.4,
      "high": 54.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2026 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "US average unit value FOB mine/plant elemental sulfur 2024 = $46.42/MT (domestic average). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": false
    },
    {
      "date": "2024-12-01",
      "index": "SR-VAN-FOB-G",
      "mid": 263.5,
      "low": 253,
      "high": 274,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-04-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-01-01",
      "index": "SR-BASIS-VG",
      "mid": 92.7,
      "low": 87.7,
      "high": 97.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-01-01",
      "index": "SR-CFR-CHINA",
      "mid": 184,
      "low": 183,
      "high": 185,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2025/01/31/price-trends-60/",
      "note": "China CFR narrowed to $183–185/t mid-January 2025.",
      "interpolated": false
    },
    {
      "date": "2025-01-01",
      "index": "SR-GULF-FOB-G",
      "mid": 164.9,
      "low": 156.9,
      "high": 172.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-01-01",
      "index": "SR-ME-FOB",
      "mid": 155,
      "low": 150,
      "high": 160,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2025/01/31/price-trends-60/",
      "note": "Middle East Q1 2025 quarterly contract $150–160/t FOB (avg $155).",
      "interpolated": false
    },
    {
      "date": "2025-01-01",
      "index": "SR-TAMPA-Q",
      "mid": 116,
      "low": 108,
      "high": 124,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2026 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "USGS: Tampa contract began 2025 at $116/LT (level entering the year).",
      "interpolated": false
    },
    {
      "date": "2025-01-01",
      "index": "SR-US-DOM-AVG",
      "mid": 46.8,
      "low": 38.8,
      "high": 54.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-01-01",
      "index": "SR-VAN-FOB-G",
      "mid": 257.6,
      "low": 247.3,
      "high": 267.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-04-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-02-01",
      "index": "SR-BASIS-VG",
      "mid": 71.8,
      "low": 66.8,
      "high": 76.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-02-01",
      "index": "SR-CFR-CHINA",
      "mid": 193.9,
      "low": 185.9,
      "high": 201.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-02-01",
      "index": "SR-GULF-FOB-G",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-02-01",
      "index": "SR-ME-FOB",
      "mid": 175.2,
      "low": 167.2,
      "high": 183.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-02-01",
      "index": "SR-TAMPA-Q",
      "mid": 169,
      "low": 161,
      "high": 177,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-04-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-02-01",
      "index": "SR-US-DOM-AVG",
      "mid": 58.1,
      "low": 50.1,
      "high": 66.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-02-01",
      "index": "SR-VAN-FOB-G",
      "mid": 251.8,
      "low": 241.7,
      "high": 261.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-04-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-03-01",
      "index": "SR-BASIS-VG",
      "mid": 52.9,
      "low": 47.9,
      "high": 57.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-03-01",
      "index": "SR-CFR-CHINA",
      "mid": 210.1,
      "low": 201.7,
      "high": 218.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-03-01",
      "index": "SR-GULF-FOB-G",
      "mid": 193.6,
      "low": 185.6,
      "high": 201.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-03-01",
      "index": "SR-ME-FOB",
      "mid": 193.5,
      "low": 185.5,
      "high": 201.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-03-01",
      "index": "SR-TAMPA-Q",
      "mid": 217,
      "low": 208.3,
      "high": 225.7,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-04-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-03-01",
      "index": "SR-US-DOM-AVG",
      "mid": 68.4,
      "low": 60.4,
      "high": 76.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-03-01",
      "index": "SR-VAN-FOB-G",
      "mid": 246.5,
      "low": 236.6,
      "high": 256.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-10-01 and 2025-04-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-04-01",
      "index": "SR-BASIS-VG",
      "mid": 29.3,
      "low": 24.3,
      "high": 34.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-04-01",
      "index": "SR-CFR-CHINA",
      "mid": 228.1,
      "low": 219,
      "high": 237.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-04-01",
      "index": "SR-GULF-FOB-G",
      "mid": 208.7,
      "low": 200.4,
      "high": 217,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-04-01",
      "index": "SR-ME-FOB",
      "mid": 213.7,
      "low": 205.2,
      "high": 222.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-04-01",
      "index": "SR-TAMPA-Q",
      "mid": 270,
      "low": 259.2,
      "high": 280.8,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2026 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Early April 2025 Tampa $270/LT.",
      "interpolated": false
    },
    {
      "date": "2025-04-01",
      "index": "SR-US-DOM-AVG",
      "mid": 79.7,
      "low": 71.7,
      "high": 87.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-04-01",
      "index": "SR-VAN-FOB-G",
      "mid": 238,
      "low": 228.5,
      "high": 247.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "Argus Media open news — Alberta sulfur inventories fall as exports climb",
      "source_url": "https://www.argusmedia.com/en/news-and-insights/latest-market-news/2731279-alberta-sulfur-inventories-fall-as-exports-climb",
      "note": "Jan–Jul 2025 Argus Vancouver FOB average $238/t (vs $78/t same period 2024).",
      "interpolated": false
    },
    {
      "date": "2025-05-01",
      "index": "SR-BASIS-VG",
      "mid": 20.8,
      "low": 15.8,
      "high": 25.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-05-01",
      "index": "SR-CFR-CHINA",
      "mid": 245.5,
      "low": 235.7,
      "high": 255.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-05-01",
      "index": "SR-GULF-FOB-G",
      "mid": 223.3,
      "low": 214.4,
      "high": 232.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-05-01",
      "index": "SR-ME-FOB",
      "mid": 233.2,
      "low": 223.9,
      "high": 242.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-05-01",
      "index": "SR-TAMPA-Q",
      "mid": 264.1,
      "low": 253.5,
      "high": 274.7,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-04-01 and 2025-07-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-05-01",
      "index": "SR-US-DOM-AVG",
      "mid": 90.7,
      "low": 82.7,
      "high": 98.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-05-01",
      "index": "SR-VAN-FOB-G",
      "mid": 244.1,
      "low": 234.3,
      "high": 253.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-04-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-06-01",
      "index": "SR-BASIS-VG",
      "mid": 17.4,
      "low": 12.399999999999999,
      "high": 22.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-06-01",
      "index": "SR-CFR-CHINA",
      "mid": 263.5,
      "low": 253,
      "high": 274,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-06-01",
      "index": "SR-GULF-FOB-G",
      "mid": 238.4,
      "low": 228.9,
      "high": 247.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-06-01",
      "index": "SR-ME-FOB",
      "mid": 253.4,
      "low": 243.3,
      "high": 263.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-06-01",
      "index": "SR-TAMPA-Q",
      "mid": 257.9,
      "low": 247.6,
      "high": 268.2,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-04-01 and 2025-07-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-06-01",
      "index": "SR-US-DOM-AVG",
      "mid": 102,
      "low": 94,
      "high": 110,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-06-01",
      "index": "SR-VAN-FOB-G",
      "mid": 255.8,
      "low": 245.6,
      "high": 266,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-04-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-07-01",
      "index": "SR-BASIS-VG",
      "mid": 14.2,
      "low": 9.2,
      "high": 19.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-07-01",
      "index": "SR-CFR-CHINA",
      "mid": 280.9,
      "low": 269.7,
      "high": 292.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-07-01",
      "index": "SR-GULF-FOB-G",
      "mid": 253,
      "low": 242.9,
      "high": 263.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-07-01",
      "index": "SR-ME-FOB",
      "mid": 273,
      "low": 262.1,
      "high": 283.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-07-01",
      "index": "SR-TAMPA-Q",
      "mid": 252,
      "low": 241.9,
      "high": 262.1,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2026 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Early July 2025 Tampa $252/LT.",
      "interpolated": false
    },
    {
      "date": "2025-07-01",
      "index": "SR-US-DOM-AVG",
      "mid": 113,
      "low": 105,
      "high": 121,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-07-01",
      "index": "SR-VAN-FOB-G",
      "mid": 267.2,
      "low": 256.5,
      "high": 277.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-04-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-08-01",
      "index": "SR-BASIS-VG",
      "mid": 10.8,
      "low": 5.800000000000001,
      "high": 15.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-08-01",
      "index": "SR-CFR-CHINA",
      "mid": 298.9,
      "low": 286.9,
      "high": 310.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-08-01",
      "index": "SR-GULF-FOB-G",
      "mid": 268.1,
      "low": 257.4,
      "high": 278.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-08-31 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-08-01",
      "index": "SR-ME-FOB",
      "mid": 293.2,
      "low": 281.5,
      "high": 304.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-01-01 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-08-01",
      "index": "SR-TAMPA-Q",
      "mid": 271.5,
      "low": 260.6,
      "high": 282.4,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-07-01 and 2025-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-08-01",
      "index": "SR-US-DOM-AVG",
      "mid": 124.4,
      "low": 116.4,
      "high": 132.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-08-01",
      "index": "SR-VAN-FOB-G",
      "mid": 278.9,
      "low": 267.7,
      "high": 290.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-04-15 and 2025-09-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-09-01",
      "index": "SR-BASIS-VG",
      "mid": 6,
      "low": 1,
      "high": 11,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-09-01",
      "index": "SR-CFR-CHINA",
      "mid": 325,
      "low": 320,
      "high": 330,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/APAC-RSMT-FER-2025-10-01-SAM-FER-Fertilizer%20Campaign-Argus%20Sulphur.pdf?version=0",
      "note": "CFR China granular $320–330/t in late-Sep 2025 public sample.",
      "interpolated": false
    },
    {
      "date": "2025-09-01",
      "index": "SR-GULF-FOB-G",
      "mid": 290,
      "low": 289,
      "high": 291,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/APAC-RSMT-FER-2025-10-01-SAM-FER-Fertilizer%20Campaign-Argus%20Sulphur.pdf?version=0",
      "note": "Public marketing PDF shows FOB US Gulf ~$289–291/t around late Sep 2025 sample.",
      "interpolated": false
    },
    {
      "date": "2025-09-01",
      "index": "SR-ME-FOB",
      "mid": 322.5,
      "low": 320,
      "high": 325,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/APAC-RSMT-FER-2025-10-01-SAM-FER-Fertilizer%20Campaign-Argus%20Sulphur.pdf?version=0",
      "note": "FOB Middle East (ex-Iran) sample ~$320–325/t late Sep 2025.",
      "interpolated": false
    },
    {
      "date": "2025-09-01",
      "index": "SR-TAMPA-Q",
      "mid": 291.1,
      "low": 279.5,
      "high": 302.7,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-07-01 and 2025-10-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-09-01",
      "index": "SR-US-DOM-AVG",
      "mid": 135.7,
      "low": 127.7,
      "high": 143.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-09-01",
      "index": "SR-VAN-FOB-G",
      "mid": 296,
      "low": 294,
      "high": 298,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Argus Sulphur marketing sample (public PDF excerpt)",
      "source_url": "https://view.argusmedia.com/rs/584-BUW-606/images/APAC-RSMT-FER-2025-10-01-SAM-FER-Fertilizer%20Campaign-Argus%20Sulphur.pdf?version=0",
      "note": "Public marketing PDF: FOB Vancouver 3Q25 $294–298/t.",
      "interpolated": false
    },
    {
      "date": "2025-10-01",
      "index": "SR-BASIS-VG",
      "mid": -2.8,
      "low": -7.8,
      "high": 2.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-10-01",
      "index": "SR-CFR-CHINA",
      "mid": 360.2,
      "low": 345.8,
      "high": 374.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2025-12-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-10-01",
      "index": "SR-GULF-FOB-G",
      "mid": 310.3,
      "low": 297.9,
      "high": 322.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2026-03-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-10-01",
      "index": "SR-ME-FOB",
      "mid": 356.3,
      "low": 342,
      "high": 370.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2025-12-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-10-01",
      "index": "SR-TAMPA-Q",
      "mid": 310,
      "low": 297.6,
      "high": 322.4,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2026 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Early October 2025 Tampa $310/LT; USGS: highest since Q2 2022.",
      "interpolated": false
    },
    {
      "date": "2025-10-01",
      "index": "SR-US-DOM-AVG",
      "mid": 146.7,
      "low": 138.7,
      "high": 154.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-10-01",
      "index": "SR-VAN-FOB-G",
      "mid": 307.5,
      "low": 305,
      "high": 310,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "Argus Media open news — Vancouver sulfur exports down on year in Aug",
      "source_url": "https://www.argusmedia.com/en/news-and-insights/latest-market-news/2738944-vancouver-sulfur-exports-down-on-year-in-aug",
      "note": "Argus Vancouver FOB spot $305–310/t on 2 Oct 2025.",
      "interpolated": false
    },
    {
      "date": "2025-11-01",
      "index": "SR-BASIS-VG",
      "mid": 31.9,
      "low": 26.9,
      "high": 36.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-11-01",
      "index": "SR-CFR-CHINA",
      "mid": 428.3,
      "low": 411.2,
      "high": 445.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2025-12-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-11-01",
      "index": "SR-GULF-FOB-G",
      "mid": 349.6,
      "low": 335.6,
      "high": 363.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2026-03-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-11-01",
      "index": "SR-ME-FOB",
      "mid": 421.9,
      "low": 405,
      "high": 438.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2025-12-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-11-01",
      "index": "SR-TAMPA-Q",
      "mid": 364.3,
      "low": 349.7,
      "high": 378.9,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-10-01 and 2026-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-11-01",
      "index": "SR-US-DOM-AVG",
      "mid": 158,
      "low": 150,
      "high": 166,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2024-12-31 and 2025-12-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-11-01",
      "index": "SR-VAN-FOB-G",
      "mid": 381.5,
      "low": 366.2,
      "high": 396.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-10-02 and 2025-12-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-12-01",
      "index": "SR-BASIS-VG",
      "mid": 102.3,
      "low": 97.3,
      "high": 107.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2025-12-01",
      "index": "SR-CFR-CHINA",
      "mid": 525,
      "low": 520,
      "high": 530,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2026/01/28/price-trends-72/",
      "note": "Late-Dec 2025 China CFR deals high $520–530s.",
      "interpolated": false
    },
    {
      "date": "2025-12-01",
      "index": "SR-GULF-FOB-G",
      "mid": 387.7,
      "low": 372.2,
      "high": 403.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2026-03-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-12-01",
      "index": "SR-ME-FOB",
      "mid": 515,
      "low": 505,
      "high": 525,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends / CRU deficit article",
      "source_url": "https://www.bcinsight.crugroup.com/2026/01/28/price-trends-72/",
      "note": "ME spot ended 2025 at $505–525/t FOB (17-year high; ~200% YoY).",
      "interpolated": false
    },
    {
      "date": "2025-12-01",
      "index": "SR-TAMPA-Q",
      "mid": 416.9,
      "low": 400.2,
      "high": 433.6,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-10-01 and 2026-01-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2025-12-01",
      "index": "SR-US-DOM-AVG",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "USGS Mineral Commodity Summaries 2026 — Sulfur",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "US average unit value FOB mine/plant 2025e = $180/MT (vs $46.42 in 2024). Relabeled from Gulf export series: domestic FOB mine/plant average, not seaborne export spot.",
      "interpolated": false
    },
    {
      "date": "2025-12-01",
      "index": "SR-VAN-FOB-G",
      "mid": 490,
      "low": 485,
      "high": 495,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends / CRU deficit article",
      "source_url": "https://www.bcinsight.crugroup.com/2026/01/28/price-trends-72/",
      "note": "Vancouver ended 2025 at $485–495/t FOB (CRU ~$490).",
      "interpolated": false
    },
    {
      "date": "2026-01-01",
      "index": "SR-BASIS-VG",
      "mid": 114.7,
      "low": 109.7,
      "high": 119.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2026-01-01",
      "index": "SR-CFR-CHINA",
      "mid": 512.5,
      "low": 510,
      "high": 515,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2026/01/28/price-trends-72/",
      "note": "Last formal China CFR assessment $510–515/t early Jan 2026.",
      "interpolated": false
    },
    {
      "date": "2026-01-01",
      "index": "SR-GULF-FOB-G",
      "mid": 427.1,
      "low": 410,
      "high": 444.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2026-03-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-01-01",
      "index": "SR-ME-FOB",
      "mid": 515,
      "low": 510,
      "high": 520,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "ChemNet — Middle East producer OSPs",
      "source_url": "https://news.chemnet.com/news-5062.html",
      "note": "Jan 2026 mainstream ME FOB ~$510–520 (KPC ~510, QatarEnergy 517, ADNOC 520).",
      "interpolated": false
    },
    {
      "date": "2026-01-01",
      "index": "SR-TAMPA-Q",
      "mid": 495.69,
      "low": 475.9,
      "high": 515.5,
      "currency": "USD",
      "unit": "LT",
      "data_type": "industry_estimate",
      "source": "Fiona Boyd (Acuity Commodities) public LinkedIn post",
      "source_url": "https://www.linkedin.com/posts/fiona-boyd-a0b93620_tampa-1q-sulphur-has-settled-at-49569lt-activity-7422074858316021760-1O9z",
      "note": "Tampa 1Q 2026 settled $495.69/LT DEL; highest since 3Q08 $617/LT DEL.",
      "interpolated": false
    },
    {
      "date": "2026-01-01",
      "index": "SR-US-DOM-AVG",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Held from last public anchor 2025-12-31",
      "interpolated": true
    },
    {
      "date": "2026-01-01",
      "index": "SR-VAN-FOB-G",
      "mid": 541.8,
      "low": 520.1,
      "high": 563.5,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-12-15 and 2026-06-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-02-01",
      "index": "SR-BASIS-VG",
      "mid": 170,
      "low": 165,
      "high": 175,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2026-02-01",
      "index": "SR-CFR-CHINA",
      "mid": 546.5,
      "low": 524.6,
      "high": 568.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Call2Supply 2026 Sulphur Price Analysis",
      "source_url": "https://call2supply.com/2026/06/25/sulphur-price-2026/",
      "note": "February 2026 CFR China $546.5/t.",
      "interpolated": false
    },
    {
      "date": "2026-02-01",
      "index": "SR-GULF-FOB-G",
      "mid": 466.4,
      "low": 447.7,
      "high": 485.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-09-15 and 2026-03-31 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-02-01",
      "index": "SR-ME-FOB",
      "mid": 525,
      "low": 504,
      "high": 546,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Call2Supply 2026 Sulphur Price Analysis (Argus-based; open article)",
      "source_url": "https://call2supply.com/2026/06/25/sulphur-price-2026/",
      "note": "February 2026 FOB Middle East near $525/t.",
      "interpolated": false
    },
    {
      "date": "2026-02-01",
      "index": "SR-TAMPA-Q",
      "mid": 531.3,
      "low": 510,
      "high": 552.6,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2026-01-15 and 2026-04-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-02-01",
      "index": "SR-US-DOM-AVG",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Held from last public anchor 2025-12-31",
      "interpolated": true
    },
    {
      "date": "2026-02-01",
      "index": "SR-VAN-FOB-G",
      "mid": 636.4,
      "low": 610.9,
      "high": 661.9,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-12-15 and 2026-06-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-03-01",
      "index": "SR-BASIS-VG",
      "mid": 181.8,
      "low": 176.8,
      "high": 186.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2026-03-01",
      "index": "SR-CFR-CHINA",
      "mid": 555,
      "low": 550,
      "high": 560,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2026/03/23/price-trends-74/",
      "note": "China CFR $550–560/t early March; Bahrain-origin 20 kt sold $555/t CFR Changjiang.",
      "interpolated": false
    },
    {
      "date": "2026-03-01",
      "index": "SR-GULF-FOB-G",
      "mid": 540,
      "low": 518.4,
      "high": 561.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "ChemAnalyst Sulphur Price Index",
      "source_url": "https://www.chemanalyst.com/Pricing-data/sulphur-39",
      "note": "USA Q1 2026 average ~USD 540/MT across Gulf Coast terminals (+25.97% QoQ).",
      "interpolated": false
    },
    {
      "date": "2026-03-01",
      "index": "SR-ME-FOB",
      "mid": 502.5,
      "low": 490,
      "high": 515,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "BC Insight Price Trends",
      "source_url": "https://www.bcinsight.crugroup.com/2026/03/23/price-trends-74/",
      "note": "Hormuz conflict: ME spot notionally $490–515/t FOB with no offers.",
      "interpolated": false
    },
    {
      "date": "2026-03-01",
      "index": "SR-TAMPA-Q",
      "mid": 590,
      "low": 566.4,
      "high": 613.6,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2026-01-15 and 2026-04-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-03-01",
      "index": "SR-US-DOM-AVG",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Held from last public anchor 2025-12-31",
      "interpolated": true
    },
    {
      "date": "2026-03-01",
      "index": "SR-VAN-FOB-G",
      "mid": 721.8,
      "low": 692.9,
      "high": 750.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-12-15 and 2026-06-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-04-01",
      "index": "SR-BASIS-VG",
      "mid": 270.4,
      "low": 265.4,
      "high": 275.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2026-04-01",
      "index": "SR-CFR-CHINA",
      "mid": 690,
      "low": 662.4,
      "high": 717.6,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2026-03-05 and 2026-05-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-04-01",
      "index": "SR-GULF-FOB-G",
      "mid": 545.9,
      "low": 524.1,
      "high": 567.7,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2026-03-31 and 2026-07-09 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-04-01",
      "index": "SR-ME-FOB",
      "mid": 580,
      "low": 570,
      "high": 600,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "ChemNet — Middle East producer OSPs",
      "source_url": "https://news.chemnet.com/news-5062.html",
      "note": "April 2026 OSPs: KPC $570, QatarEnergy $570, ADNOC $600 FOB.",
      "interpolated": false
    },
    {
      "date": "2026-04-01",
      "index": "SR-TAMPA-Q",
      "mid": 655,
      "low": 628.8,
      "high": 681.2,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "Argus Media open news — Tampa 3Q liquid sulphur $705/lt",
      "source_url": "https://www.argusmedia.com/en/news-and-insights/latest-market-news/2851577-tampa-3q-liquid-sulphur-price-hits-record-705-lt",
      "note": "Q2 2026 Tampa molten contract $655/LT DEL.",
      "interpolated": false
    },
    {
      "date": "2026-04-01",
      "index": "SR-US-DOM-AVG",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Held from last public anchor 2025-12-31",
      "interpolated": true
    },
    {
      "date": "2026-04-01",
      "index": "SR-VAN-FOB-G",
      "mid": 816.3,
      "low": 783.6,
      "high": 849,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-12-15 and 2026-06-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-05-01",
      "index": "SR-BASIS-VG",
      "mid": 186.4,
      "low": 181.4,
      "high": 191.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2026-05-01",
      "index": "SR-CFR-CHINA",
      "mid": 910,
      "low": 873.6,
      "high": 946.4,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Call2Supply 2026 Sulphur Price Analysis",
      "source_url": "https://call2supply.com/2026/06/25/sulphur-price-2026/",
      "note": "May 2026 CFR China $910/t.",
      "interpolated": false
    },
    {
      "date": "2026-05-01",
      "index": "SR-GULF-FOB-G",
      "mid": 721.4,
      "low": 692.5,
      "high": 750.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2026-03-31 and 2026-07-09 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-05-01",
      "index": "SR-ME-FOB",
      "mid": 755,
      "low": 740,
      "high": 765,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "ChemNet — Middle East May OSPs",
      "source_url": "https://news.chemnet.com/news-5062.html",
      "note": "May 2026 OSPs: KPC $765, QatarEnergy $740, ADNOC $760 FOB.",
      "interpolated": false
    },
    {
      "date": "2026-05-01",
      "index": "SR-TAMPA-Q",
      "mid": 671.5,
      "low": 644.6,
      "high": 698.4,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2026-04-01 and 2026-07-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-05-01",
      "index": "SR-US-DOM-AVG",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Held from last public anchor 2025-12-31",
      "interpolated": true
    },
    {
      "date": "2026-05-01",
      "index": "SR-VAN-FOB-G",
      "mid": 907.8,
      "low": 871.5,
      "high": 944.1,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2025-12-15 and 2026-06-15 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-06-01",
      "index": "SR-BASIS-VG",
      "mid": 142.3,
      "low": 137.3,
      "high": 147.3,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2026-06-01",
      "index": "SR-CFR-CHINA",
      "mid": 1075,
      "low": 1032,
      "high": 1118,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Call2Supply 2026 Sulphur Price Analysis",
      "source_url": "https://call2supply.com/2026/06/25/sulphur-price-2026/",
      "note": "June 2026 CFR China $1,075/t.",
      "interpolated": false
    },
    {
      "date": "2026-06-01",
      "index": "SR-GULF-FOB-G",
      "mid": 902.7,
      "low": 866.6,
      "high": 938.8,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2026-03-31 and 2026-07-09 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-06-01",
      "index": "SR-ME-FOB",
      "mid": 805,
      "low": 772.8,
      "high": 837.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Discovery Alert — KPC June sulphur price",
      "source_url": "https://discoveryalert.com.au/kuwait-sulphur-price-hormuz-fertiliser-supply-chains-2026/",
      "note": "KPC June sulphur $805/t FOB Kuwait (article headline figure).",
      "interpolated": false
    },
    {
      "date": "2026-06-01",
      "index": "SR-TAMPA-Q",
      "mid": 688.5,
      "low": 661,
      "high": 716,
      "currency": "USD",
      "unit": "LT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "note": "Interpolated between 2026-04-01 and 2026-07-01 public anchors",
      "interpolated": true
    },
    {
      "date": "2026-06-01",
      "index": "SR-US-DOM-AVG",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Held from last public anchor 2025-12-31",
      "interpolated": true
    },
    {
      "date": "2026-06-01",
      "index": "SR-VAN-FOB-G",
      "mid": 1045,
      "low": 990,
      "high": 1100,
      "currency": "USD",
      "unit": "MT",
      "data_type": "industry_estimate",
      "source": "Discovery Alert — KPC June sulphur / Vancouver inversion commentary",
      "source_url": "https://discoveryalert.com.au/kuwait-sulphur-price-hormuz-fertiliser-supply-chains-2026/",
      "note": "June 2026 Vancouver FOB spot cited $990–1,100/t; temporary ME inversion on Hormuz risk.",
      "interpolated": false
    },
    {
      "date": "2026-07-01",
      "index": "SR-BASIS-VG",
      "mid": -80,
      "low": -85,
      "high": -75,
      "currency": "USD",
      "unit": "MT",
      "data_type": "derived",
      "source": "Sulfur Wire derived",
      "note": "Vancouver FOB mid minus US Gulf FOB mid",
      "interpolated": false
    },
    {
      "date": "2026-07-01",
      "index": "SR-CFR-CHINA",
      "mid": 1075,
      "low": 1032,
      "high": 1118,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://call2supply.com/2026/06/25/sulphur-price-2026/",
      "note": "Held from last public anchor 2026-06-15",
      "interpolated": true
    },
    {
      "date": "2026-07-01",
      "index": "SR-GULF-FOB-G",
      "mid": 1125,
      "low": 1100,
      "high": 1150,
      "currency": "USD",
      "unit": "MT",
      "data_type": "verified_public",
      "source": "Argus Media open news — Tampa 3Q liquid sulphur $705/lt",
      "source_url": "https://www.argusmedia.com/en/news-and-insights/latest-market-news/2851577-tampa-3q-liquid-sulphur-price-hits-record-705-lt",
      "note": "US Gulf refinery spot granular exports $1,100–1,150/t FOB on 9 Jul 2026.",
      "interpolated": false
    },
    {
      "date": "2026-07-01",
      "index": "SR-ME-FOB",
      "mid": 805,
      "low": 772.8,
      "high": 837.2,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://discoveryalert.com.au/kuwait-sulphur-price-hormuz-fertiliser-supply-chains-2026/",
      "note": "Held from last public anchor 2026-06-15",
      "interpolated": true
    },
    {
      "date": "2026-07-01",
      "index": "SR-TAMPA-Q",
      "mid": 705,
      "low": 676.8,
      "high": 733.2,
      "currency": "USD",
      "unit": "LT",
      "data_type": "verified_public",
      "source": "Argus Media open news — Tampa 3Q liquid sulphur $705/lt",
      "source_url": "https://www.argusmedia.com/en/news-and-insights/latest-market-news/2851577-tampa-3q-liquid-sulphur-price-hits-record-705-lt",
      "note": "Q3 2026 Tampa molten contract record $705/LT DEL (+$50 from Q2 $655).",
      "interpolated": false
    },
    {
      "date": "2026-07-01",
      "index": "SR-US-DOM-AVG",
      "mid": 180,
      "low": 172,
      "high": 188,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-sulfur.pdf",
      "note": "Held from last public anchor 2025-12-31",
      "interpolated": true
    },
    {
      "date": "2026-07-01",
      "index": "SR-VAN-FOB-G",
      "mid": 1045,
      "low": 990,
      "high": 1100,
      "currency": "USD",
      "unit": "MT",
      "data_type": "platform_estimate",
      "source": "Sulfur Wire platform estimate",
      "source_url": "https://discoveryalert.com.au/kuwait-sulphur-price-hormuz-fertiliser-supply-chains-2026/",
      "note": "Held from last public anchor 2026-06-15",
      "interpolated": true
    }
  ],
  "disclaimer": "Public reference data. Not a licensed PRA assessment redistributor."
}