[
  {
    "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-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-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": "2021-03-01",
    "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-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": "2021-07-01",
    "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": "2021-09-01",
    "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-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-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": "2021-12-01",
    "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": "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": "2022-04-01",
    "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": "2022-05-01",
    "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-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-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-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": "2022-07-01",
    "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": "2022-08-01",
    "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": "2022-09-01",
    "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-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": "2022-10-01",
    "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": "2022-12-01",
    "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": "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-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": "2023-03-01",
    "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": "2023-04-01",
    "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": "2023-05-01",
    "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-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": "2023-07-01",
    "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": "2023-10-01",
    "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": "2023-11-01",
    "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-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-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-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-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": "2024-02-01",
    "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-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": "2024-03-01",
    "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-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": "2024-04-01",
    "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": "2024-06-01",
    "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": "2024-07-01",
    "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": "2024-08-01",
    "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-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-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": "2024-10-01",
    "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-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": "2024-12-01",
    "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": "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-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": "2025-04-01",
    "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-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": "2025-07-01",
    "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": "2025-09-01",
    "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-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-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-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": "2025-12-01",
    "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-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-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-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-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": "2026-02-01",
    "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-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": "2026-03-01",
    "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": "2026-04-01",
    "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": "2026-05-01",
    "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-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": "2026-06-01",
    "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-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-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-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-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
  }
]