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    Macmahon at Mt Marion: underground shift and design notes for lithium mine teams

    July 15, 2026|

    Reviewed by Tom Sullivan

    First reported on International Mining – News

    30 Second Briefing

    Macmahon Underground Pty Ltd has secured an underground mining services contract at the Mt Marion lithium operation, 70 km south of Kalgoorlie, jointly owned by Mineral Resources and Jiangxi Ganfeng Lithium on a 50:50 basis. The scope covers underground development and production work, signalling a shift from Mt Marion’s historically open-pit focus towards a deeper, longer-life operation. Geotechnical and mine planning teams should expect new requirements around underground ground control, ventilation, and ore handling design for hard-rock lithium orebodies in the Eastern Goldfields setting.

    Technical Brief

    • Contract executed by Macmahon Underground Pty Ltd, a wholly owned Macmahon Holdings subsidiary, for Mt Marion.
    • Scope explicitly defined as “underground mining services”, covering both development and production activities.
    • Ownership split remains 50:50 between Mineral Resources Ltd and Jiangxi Ganfeng Lithium Co. Ltd.

    Our Take

    The recent A$490 million brownfield expansion FID at the Mt Marion lithium operation by Mineral Resources and Jiangxi Ganfeng Lithium signals that Macmahon’s underground scope is likely tied to a long-life, higher-throughput phase rather than a short-term development package.

    With Mineral Resources and Ganfeng each holding 50% of Mt Marion, contractor performance by Macmahon Underground at this Western Australia asset will be visible to both an Australian multi-commodity operator and a major Chinese lithium chemicals player, which can influence future underground tendering opportunities in our database.

    Macmahon Underground’s selection here follows its preferred contractor status at the Groundrush decline for the Central Tanami gold project, suggesting the company is building a track record in complex underground development that spans both gold and lithium projects in remote Australian regions.

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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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