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    Hudbay Constancia mill to 34 mtpa: throughput and permit insights for mine planners

    July 3, 2026|

    Reviewed by Joe Ashwell

    Hudbay Constancia mill to 34 mtpa: throughput and permit insights for mine planners

    First reported on MINING.com

    30 Second Briefing

    Hudbay Minerals has secured SENACE approval to lift Constancia’s nominal mill capacity from 31 to 34 mtpa, the fifth amendment to the mine’s environmental permit since operations began in 2014. The new authorisation, aligned with Peru’s Ministry of Energy and Mines rules, also preserves flexibility to run up to 10% above the 34 mtpa limit on a daily basis, after the site processed 30.3 and 31.9 million tonnes of ore in the past two years. Constancia produced 85,155 tonnes of copper in 2025, plus gold, silver and molybdenum by-products.

    Technical Brief

    • SENACE’s fifth permit amendment follows mine plan optimisation, life extension and added processing infrastructure at Constancia.
    • Previous permit in March 2026 had only just raised nominal throughput from 29.9 to 31 mtpa.
    • Regulatory framework from Peru’s Ministry of Energy and Mines explicitly allows up to +10% daily over nominal.
    • Actual plant performance already reached 31.9 Mt ore processed in the most recent year under the prior cap.
    • 2025 by-products included 74,480 oz gold, 2.41 Moz silver and 1,282 t molybdenum alongside copper output.
    • Hudbay’s market capitalisation is about C$14.6 billion, with share price moving −2.5% on the permit news day.

    Our Take

    With Constancia already operating near its previous nominal 31 mtpa limit in recent years, the extra permitted capacity effectively formalises Hudbay’s higher operating baseline and should help keep unit costs competitive against other Andean copper producers in our database that lack similar regulatory flexibility.

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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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