Alberta inventory draw underway under elevated export margins

By mid-2025 the Alberta inventory story had turned from buffer build to draw. Argus, citing AER data, reported closing sulfur inventory at 11.66 Mt in July 2025, down more than 377 kt or about 3% year on year, and the lowest since May 2019. Export-process costs typically exceeding $150/t meant draws required supportive Vancouver FOB; the $238/t Jan-Jul average cleared that hurdle for many tonnes. Remelt into molten for rail to BC and Alberta prillers, then solid loadout at Vancouver and Port Moody, was the physical path. Metals demand was cited as a medium-term floor even if phosphate affordability softened. UNCERTAIN: how much of the 377 kt YoY drop was oil sands block remelt versus lower new pour. Mid-2025 made the inventory draw visible in AER-linked reporting. Closing stocks at 11.66 Mt in July, down more than 377 kt year on year and lowest since May 2019, are the clearest provincial print of the five-year window. Export-process costs above $150/t had previously justified pouring; $238/t January-July FOB averages justified the reverse. Physical flows ran through remelt, molten rail to BC and Alberta prillers, solid loadout at Vancouver and Port Moody, and vessel stems to diversified destinations. Metals demand was cited as a medium-term floor if phosphate affordability wobbled. The draw is a stock release, not a rise in oil sands Claus nameplate. UNCERTAIN remains the split between block remelt and reduced new pour inside the 377 kt year-on-year change, a distinction that only facility-level AER products can refine.

Key points

• AER via Argus: Alberta inventory 11.66 Mt July 2025, lowest since May 2019.
• YoY draw >377 kt (~3%).
• Export chain cost often >$150/t; 2025 FOB supported remelt.
• Vancouver H1 export pace already ahead of soft 2024 price year.
• UNCERTAIN: block remelt vs reduced Claus pour split in the draw.

Sources

• Alberta sulfur inventories fall as exports climb (Argus)
• AER Sulphur Balance Report catalogue

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Public reference summary. Weekly PRA assessments require a commercial license. Not investment advice.