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    Cambria’s late‑2027 Premier mill restart: design, capex and ESG notes for engineers

    October 6, 2026|

    Reviewed by Tom Sullivan

    Cambria’s late‑2027 Premier mill restart: design, capex and ESG notes for engineers

    First reported on MINING.com

    30 Second Briefing

    Cambria Gold Mines plans to recommission the 2,500 t/d Premier mill in northern British Columbia in Q4 2027, drawing initial underground feed from the Premier, Silver Coin and Big Missouri deposits before adding Red Mountain ore trucked roughly 50 km via Stewart and Hyder. The company has spent C$538 million on the complex since 2021, is drilling Premier on 12.5 m centres, and will install a new crusher, pre-leach thickener, fine-grinding mill and second cyanide-detox tank ahead of Red Mountain processing. A Fisheries Act authorisation now allows reconstruction of the Red Mountain access road along Bitter Creek, while Premier’s water-treatment plant still needs upgrades to consistently meet zinc-discharge limits.

    Technical Brief

    • Premier’s 2020 resource: 4.14 Mt indicated at 8.01 g/t Au (1.07 Moz) plus 5.06 Mt inferred at 7.25 g/t (1.18 Moz).
    • Red Mountain resource: 3.19 Mt measured and indicated at 7.63 g/t Au (783 koz) plus 405 kt inferred at 5.3 g/t (69.3 koz).
    • Underground development shortfalls at Big Missouri and Premier Northern Lights previously forced a mill shutdown after only five months’ operation.
    • A Fisheries Act authorisation now permits in-channel works in Bitter Creek to rebuild 2013 storm-damaged road sections.
    • Road construction targets Bromley Humps, 12 km from Highway 37A, by year-end, with alpine completion next year.
    • Cambria is evaluating an aerial tram or rope conveyor from Red Mountain to Bitter Creek after year one of trucking.
    • Premier’s water-treatment plant, built in 2024, has struggled to meet zinc discharge limits despite recent pump, valve and pipe upgrades.
    • Operational control of the water-treatment plant was moved in-house from a contractor, with specialist support to stabilise effluent quality.

    Our Take

    The late-2027 to 2028 restart target for the Premier mill aligns with Ascot’s earlier hub-and-spoke concept outlined in our 11 Feb 2026 coverage, where ore from Red Mountain would be trucked roughly 50 km via Stewart and Hyder, signalling that Cambria is structurally committing to that regional processing model rather than a standalone mine approach.

    With about C$538 million already sunk into the Premier complex against a current market capitalisation of roughly C$287 million, Cambria Gold Mines is trading at a notable discount to invested capital, which in our database often attracts event-driven investors and can pressure management towards clearer timelines like the late-2027 restart to close that valuation gap.

    The tight 12.5 m drill spacing at Premier combined with multi-million-ounce indicated and inferred gold resources at both Premier and Red Mountain places this B.C. gold hub among the more advanced, de-risked projects in our 1263 Mining stories set, contrasting with many earlier-stage Canadian gold entries that still rely on wide-spaced drilling and conceptual mine plans.

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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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