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    Freeport’s $7.5bn El Abra copper expansion: design and capex notes for mine planners

    March 20, 2026|

    Reviewed by Tom Sullivan

    Freeport’s $7.5bn El Abra copper expansion: design and capex notes for mine planners

    First reported on MINING.com

    30 Second Briefing

    Freeport-McMoRan has filed for environmental approval of a $7.5 billion expansion at the El Abra copper mine in Chile, adding a new concentrator, desalination plant, water pumping system and expanded mine infrastructure while continuing leaching. The 51:49 Freeport–Codelco project aims to lift output by over 300,000 tonnes of copper per year from 91,000 tonnes in 2024, potentially moving El Abra from 17th to third-largest in Chile, with production targeted for 2033. It is the largest mining investment ever submitted to Chile’s SEA, alongside a separate $5 billion Escondida concentrator filing this week.

    Technical Brief

    • Capex of $7.5 billion makes El Abra the largest mining investment ever filed with Chile’s SEA since at least 1992.
    • Ownership remains split 51% Freeport-McMoRan and 49% Codelco, aligning major private–state interests on one asset.
    • Production ramp-up is contingent on SEA approval, with Diario Financiero flagging 2033 as the indicative start date.
    • Cochilco data place El Abra as Chile’s 17th-largest copper operation pre-expansion, framing the scale of the step-change.
    • Within Cochilco’s 2025–2034 pipeline, only the proposed $8 billion Collahuasi concentrator exceeds El Abra’s investment size.
    • Collahuasi’s new concentrator remains at feasibility and engineering stage, with no date yet set for environmental submission.
    • Chile’s Economy and Mining Minister Daniel Mas estimates faster approvals could unlock “billions of dollars” and >20,000 jobs, signalling strong political backing for large copper projects.

    Our Take

    Codelco’s 49% stake in El Abra means this $7.5 billion expansion would sit alongside its SQM-Codelco lithium ventures and the Salar Futuro project, signalling that Codelco is increasingly exposed to both copper and lithium megaproject execution risk in Chile’s 2025–2034 investment window tracked by Cochilco.

    The Dominga case in the Antofagasta Court of Appeals and the scale of the Collahuasi and Escondida concentrator proposals suggest that SEA and Chilean courts are now routinely handling multi‑billion‑dollar copper and lithium files, which is likely to lengthen timelines and increase legal scrutiny for projects like El Abra’s expansion.

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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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