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    Boston Metal’s $75m MOE raise: flowsheet and smelting notes for mine planners

    May 20, 2026|

    Reviewed by Joe Ashwell

    Boston Metal’s $75m MOE raise: flowsheet and smelting notes for mine planners

    First reported on International Mining – News

    30 Second Briefing

    Boston Metal has raised $75 million, taking total funding above $500 million, to accelerate deployment of its Molten Oxide Electrolysis (MOE) platform for emissions-free production of steel and critical metals. The capital will be used to scale MOE cells and associated high-temperature power electronics for commercial plants in the US and other regions, moving from pilot-scale units towards industrial modules. For mining and metallurgical projects, this signals growing investor backing for alternative smelting routes that can bypass coke-based blast furnaces and potentially alter future project flowsheets.

    Technical Brief

    • Molten Oxide Electrolysis uses an inert anode in a conductive slag bath to directly reduce oxides.
    • Process operates at high temperature, allowing direct treatment of solid ore fines without agglomeration.
    • Electrolysis cell design decouples metal quality from reductant chemistry, shifting control to power quality and slag design.
    • Platform targets critical metals recovery from complex, low-grade or polymetallic feeds that are uneconomic in conventional smelters.
    • Modular MOE cells are intended to be arrayed into industrial-scale banks, analogous to aluminium smelter potlines.
    • High-temperature power electronics must manage large DC loads and rapid load changes compatible with variable renewable supply.
    • For mine flowsheets, MOE enables siting smelting capacity closer to ore sources, reducing concentrate transport requirements.
    • Funding scale signals investor willingness to back electrolysis-based smelting alongside hydrogen DRI and plasma routes.

    Our Take

    Boston Metal already features in our coverage through its MoU with St George Mining to trial molten oxide electrolysis for niobium and rare earths in Brazil, signalling that this United States-based platform is being positioned for export into critical metals projects in other jurisdictions.

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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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