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    Resolution Copper $110m drilling, development push: key notes for mine planners

    August 10, 2026|

    Reviewed by Tom Sullivan

    First reported on International Mining – News

    30 Second Briefing

    Resolution Copper has let about $110 million in contracts to Major Drilling America and Redpath USA to accelerate exploration drilling and underground development at its proposed deep copper mine in Arizona. The work forms a major early tranche of an approximately $500 million post-FEIS investment programme, signalling a shift from study to execution-phase activities. For geotechnical and mining teams, this points to imminent ramp-up in underground access, drilling density, and ground characterisation data ahead of any full-scale shaft sinking or block-cave development decisions.

    Technical Brief

    • Contract awards split between Major Drilling America Inc and Redpath USA Corporation for distinct scopes.
    • Work is tied directly to the proposed Resolution Copper deep underground mine in Arizona.
    • Packages are among the first commitments triggered after completion of the Final Environmental Impact Statement.
    • The $110 million allocation forms an early tranche within a much larger $500 million programme.
    • Similar post-FEIS contracting structures are increasingly used to de-risk deep block-cave style copper projects.

    Our Take

    The related coverage noting Resolution Copper as a Rio Tinto (55%)–BHP (45%) joint venture signals that this US$500 million investment phase at the Arizona operation is effectively being underwritten by two of the strongest balance sheets in global copper, which tends to de‑risk long-lead underground development for contractors such as Redpath and Major Drilling.

    The earlier land exchange completion with the US Forest Service referenced in the related article indicates that key federal permitting hurdles are already being addressed, so the new underground and drilling contracts at the Resolution Copper mine are likely aimed at advancing resource definition and access development ahead of any final investment decision rather than simply maintaining care-and-maintenance status.

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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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