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    Sierra Gorda 25% capacity uplift: process and tailings implications for engineers

    July 2, 2026|

    Reviewed by Tom Sullivan

    First reported on International Mining – News

    30 Second Briefing

    Sierra Gorda, the Chilean open-pit copper mine in which South32 holds a 45% interest, has approved construction of a fourth grinding line following a completed feasibility study. The brownfield plant expansion is designed to lift processing capacity by about 25%, debottlenecking the existing concentrator rather than adding new mining fronts. For process and geotechnical teams, the project signals higher mill throughput demands on existing tailings and water circuits, with scope for re-optimising grinding media, liner wear strategies and cyclone classification.

    Technical Brief

    • South32 holds a 45% interest in the Sierra Gorda joint venture operating the Chilean open pit.

    Our Take

    South32’s 45% interest in the Sierra Gorda joint venture sits alongside its ongoing copper exposure elsewhere, even as related coverage shows it divesting most aluminium assets to Alcoa, signalling a portfolio tilt toward base metals like copper rather than alumina and smelting.

    The recent MoU between Sierra Gorda SCM and BHP’s Spence mine in Chile, also centred on copper operations, suggests that a 25% processing uplift at Sierra Gorda could be leveraged through shared technical initiatives on debottlenecking, water use and power efficiency across the Antofagasta district.

    Within our 291 copper-tagged pieces, Sierra Gorda appears as one of the few large Chilean sulphide operations undergoing a major brownfield processing expansion rather than a greenfield build, which typically implies lower incremental capital intensity but higher demands on tailings and water infrastructure optimisation.

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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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