Macmahon Holdings’ wholly owned subsidiary, Macmahon Underground, has signed a contract valued at A$355m ($247m) to provide mining services at the Mt Marion lithium operation in Western Australia.
The three-year agreement includes an option for a one-year extension and involves comprehensive development and production mining activities.
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The Mt Marion site, situated 70km south of Kalgoorlie and 590km east of Perth, is co-owned by Mineral Resources and Jiangxi Ganfeng Lithium.
This operation marks an important development phase in transitioning the Mt Marion mine.
Macmahon managing director and CEO Michael Finnegan said: “This is a high-quality, long-term opportunity to collaborate alongside strong, aligned partners, and positions Macmahon Underground firmly on the global stage as a tier one contractor in future-facing commodities.
“We look forward to working closely with the joint venture to unlock the full potential of this operation and support its continued growth as a globally significant lithium asset.”
Mt Marion, which began open-pit mining in 2016, operates under a life-of-mine, build-own-operate agreement managed by Mineral Resources.
The infrastructure at the site includes multiple open-pit mines, a processing plant with a Dense Media Separation concentrator, waste dumps, a run of mine pad and tailings storage facilities.
Mineral Resources Underground Mine planning manager Andrew Cooper said: “We are focused on systematically building the technical and operational capability to unlock the full potential of the Mt Marion orebody.
“Macmahon brings proven underground expertise to support our mining plans and together we are focused on executing this safely and efficiently.”
In May 2026, Mineral Resources confirmed a final investment decision to expand operations at the Mt Marion lithium project. The planned expansion will introduce both a flotation plant and underground mining at the site.
