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    Perpetua–Idaho National Lab antimony plant: design and supply‑chain notes for miners

    December 11, 2025|

    Reviewed by Joe Ashwell

    Perpetua–Idaho National Lab antimony plant: design and supply‑chain notes for miners

    First reported on MINING.com

    30 Second Briefing

    Perpetua Resources has partnered with Idaho National Laboratory, under Battelle Energy Alliance, to host, commission and operate a flexible, modular pilot plant to process Stibnite project ore into military‑specification antimony trisulphide concentrate for munitions and advanced defence systems. The pilot forms part of a US Army Defence Ordnance Technology Consortium agreement, with Perpetua now holding up to US$22.4 million in DOTC funding to advance domestic critical mineral processing. It runs alongside early works on the US$1.3 billion Stibnite gold‑antimony mine in central Idaho, aimed at a fully domestic “ground‑to‑round” supply chain.

    Technical Brief

    • Idaho National Laboratory, via Battelle Energy Alliance, will host, commission and operate the pilot facility.
    • Facility is also expected to recover other critical and defence‑related minerals from Perpetua’s ores.

    Our Take

    Perpetua Resources is one of the few antimony-focused names that recurs across our 82 keyword-matched pieces, signalling that the Stibnite Gold project is emerging as a flagship US antimony story rather than a peripheral by-product play.

    The US$22.4 million in cumulative DOTC awards is modest against the US$1.3 billion Stibnite capex, but it materially de-risks the antimony processing flowsheet and defence-use case, which can help Perpetua in future permitting and offtake negotiations.

    The Idaho National Laboratory partnership, also noted in our December 2025 antimony pilot-plant coverage, positions Stibnite as a test bed for modular critical-mineral processing in the US, a differentiator versus other gold–antimony projects that rely on offshore smelting capacity.

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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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