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    Resolution Copper land exchange: deep block-cave design and subsidence lens for engineers

    March 17, 2026|

    Reviewed by Tom Sullivan

    First reported on International Mining – News

    30 Second Briefing

    Resolution Copper, the Rio Tinto (55%)–BHP (45%) joint venture in Arizona, has completed a land exchange with the US Forest Service, clearing a key federal hurdle for developing one of the world’s largest undeveloped copper orebodies at Oak Flat. The deal transfers federally owned land above the deep underground deposit to the company in return for conservation parcels elsewhere, enabling progression of mine permitting and detailed engineering. Geotechnical design for very deep block-cave mining and associated surface subsidence management now moves to the foreground.

    Technical Brief

    • Rio Tinto holds 55% and BHP 45% of the Resolution Copper joint venture ownership.

    Our Take

    Resolution Copper adds to the concentration of copper exposure in our database around Rio Tinto, which also features in recent coverage of ACG Metals’ acquisition strategy targeting producing and near-producing copper assets, signalling that large diversified miners remain central reference points for copper M&A and portfolio moves.

    Within the 249 copper-tagged pieces in our coverage, very few involve US-based greenfield developments of this scale, so a completed land exchange with the US Forest Service positions Resolution Copper as one of the more advanced large copper growth options in the United States pipeline.

    The timing of this US copper project milestone aligns with the US Department of Energy’s recent $500 million critical minerals funding call, suggesting that permitting and land-access progress at assets like Resolution Copper could become increasingly important in policy debates about domestic copper supply security.

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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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