The testwork, which targeted pollucite concentrate grading 12% Cs2O, successfully isolated caesium while effectively managing impurities such as aluminum. Beyond primary extraction, researchers identified a secondary opportunity to recover rubidium as a by-product, a prospect the company intends to investigate in subsequent phases. Parallel to the conventional sulphuric acid approach, PMET is collaborating with Koch Technology Solutions to evaluate a proprietary flowsheet designed for high-selectivity caesium recovery.
PMET Hits 97% Caesium Recovery in Shaakichiuwaanaan Bench Tests
PMET Resources has achieved a recovery rate exceeding 97% in initial bench-scale tests to extract caesium from pollucite concentrate. Conducted at SGS Canada’s Lakefield facility, the program utilized sulphuric acid leaching to process material from the company’s Shaakichiuwaanaan Project in Quebec, marking a milestone in potential value-added chemical production.
These technical programs are part of a broader strategy to unlock the economic potential of the Shaakichiuwaanaan property, which hosts one of the world’s largest pollucite-hosted caesium deposits. PMET plans to move into a proof-of-concept phase, aiming to produce gram-scale samples of high-purity caesium sulphate, carbonate, and formate by the end of 2026. These results will feed into a Preliminary Economic Assessment for the project, scheduled for completion in Q4 2026 alongside a feasibility study focused on the site's lithium assets.
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