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    Lundin’s US$150M Caserones upgrade: heap leach and water strategy for mine engineers

    January 9, 2026|

    Reviewed by Tom Sullivan

    Lundin’s US$150M Caserones upgrade: heap leach and water strategy for mine engineers

    First reported on MINING.com

    30 Second Briefing

    Lundin Mining has filed for Chilean environmental approval for a US$150 million upgrade at the Caserones copper-molybdenum mine, aiming to maintain current production and fresh water use while extending operating continuity to 2039. The project adds new access roads, a fresh water reservoir, two backup sulphuric acid storage tanks, and a 90 Mt increase in heap leach capacity, while extending operations at the existing solvent extraction–electrowinning plant. Caserones currently processes about 84 Mt/a of ore with 100,000 t/d milling capacity and up to 35,000 t/a cathode output, but faces declining grades and lower production from 2027.

    Technical Brief

    • Environmental approval was filed on 6 January 2026 with Chile’s Environmental Evaluation Service via SCM Minera Lumina Copper.
    • Permit conditions are proposed to keep all input and output volumes identical to the 2010 RCA.
    • Declining Chilean ore grades are forecast to drop Caserones output to 105,000–115,000 t from 2027.
    • The mine currently treats about 84 Mt of ore per year against an installed milling capacity of 100,000 t/d.
    • Lundin drilled 18 km around Caserones in 2025 to support potential brownfield resource growth and future expansions.
    • Caserones is integrated into Lundin’s Vicuña district strategy alongside Josemaría and Filo del Sol on the Chile–Argentina border.
    • Group-wide, Lundin is targeting 500,000 t/a copper and ~550,000 oz/a gold within three to five years, mainly via brownfield expansions.

    Our Take

    With Caserones already processing about 84 Mt/a, a 90 Mt leach capacity boost signals a pivot to maximising metal recovery from lower-grade ore and stockpiles, which can materially improve unit costs without the permitting risk of a greenfield expansion in Chile’s Atacama Region.

    Extending Caserones’ operating continuity to 2039 under a 70/30 Lundin–JX Advanced Metals ownership structure gives Japanese downstream users long-term copper and molybdenum exposure from Latin America, which is strategically valuable as AI-linked forecasts in our database point to copper demand potentially rising by around 50% by 2040.

    The 18 km of drilling completed around Caserones in 2025, combined with nearby Lundin projects like Josemaría and Filo del Sol in the Vicuña district, suggests the company is de-risking a district-scale copper hub on the Chile–Argentina border rather than treating Caserones as a stand-alone asset.

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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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