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    St George Mining–Boston Metal MOE trial: flowsheet implications for niobium projects

    April 7, 2026|

    Reviewed by Joe Ashwell

    First reported on International Mining – News

    30 Second Briefing

    St George Mining has signed an MoU with Boston Metal to trial molten oxide electrolysis (MOE) for niobium production at St George’s 100%-owned Araxá niobium-rare earths project in Minas Gerais, Brazil. The joint project will test MOE’s ability to improve niobium recovery and processing efficiency compared with conventional pyrometallurgical and hydrometallurgical routes. For mine developers and metallurgists, the trial will indicate whether MOE can offer a lower-emission, potentially lower-cost flowsheet option for future niobium and REE concentrate processing at Araxá-scale deposits.

    Technical Brief

    • MoU establishes a joint project structure between St George Mining and Boston Metal at Araxá.

    Our Take

    With both niobium and REE flagged as keywords in our database, a Brazil-based trial using alternative processing routes could be strategically important for downstream users looking to diversify away from China-centric rare earth processing while still leveraging Brazil’s dominant niobium position.

    Minas Gerais already features heavily in our Projects-tagged pieces for iron ore and base metals; adding a MOE-focused niobium-REE initiative there suggests the state is becoming a test bed for lower-emission metallurgical technologies that could later migrate to larger iron and battery-metal operations in the region.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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