Rio Tinto’s $144m Resolution Copper spend: design and schedule lens for mine engineers
Reviewed by Tom Sullivan
First reported on MINING.com
30 Second Briefing
Rio Tinto has approved a $144 million spend, including $79 million from its 55% stake alongside BHP’s 45%, to advance feasibility studies, mining equipment design and water treatment facilities for the Resolution Copper project in Arizona. The deep deposit, lying 1,524–2,134 metres below surface and estimated at more than 40 billion lb (18.1 million tonnes) of copper, is targeted for first production in the mid‑2030s and could supply up to 25% of US copper demand. Development follows a contentious federal land transfer affecting the sacred Oak Flat area and will require extensive underground infrastructure before commercial output.
Technical Brief
- Latest $144m allocation follows ~$110m of contracts in August for exploration and underground development.
- Project lies near Superior, Arizona, with orebody at 1,524–2,134 m depth driving complex hoisting and ventilation needs.
- Joint venture ownership remains 55% Rio Tinto, 45% BHP, aligning capex exposure with operatorship and technical decision-making.
- Around 50 additional jobs are expected in this phase, mainly technical, engineering and study roles rather than operations.
- Native American opposition centred on religious and cultural impacts at Oak Flat, implying stringent future permitting and mitigation requirements.
- Once operational, Resolution Copper is forecast to add roughly US$1 billion per year to Arizona’s economy.
Our Take
JPMorgan’s separate mapping of 1.3 million tonnes a year of potential new US copper capacity explicitly highlights Resolution Copper as the lead project, so this $144 million push reinforces its role as the anchor asset in any scenario where US output more than doubles.
Across our 1257 Mining stories, Rio Tinto appears frequently in iron ore and now increasingly in critical minerals, and pairing this Arizona copper build-out with its recent Sal de Vida lithium commissioning in Argentina signals a deliberate reweighting of its growth pipeline towards energy-transition metals in the Americas.
Because Resolution Copper is framed as potentially supplying about a quarter of US copper demand, any permitting or community delays around Oak Flat would not just affect Rio Tinto and BHP but would materially constrain the upside in US copper self-sufficiency that JPMorgan and other analysts are currently modelling.
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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