Mariana Copper One autonomy-first mine and refinery: retrofit lessons for engineers
Reviewed by Tom Sullivan

First reported on International Mining – News
30 Second Briefing
Mariana Minerals plans to turn its Copper One operation in southeastern Utah into what it calls the world’s first “autonomy‑first” integrated copper mine and refinery, building on an existing open pit, heap bioleach pads and a hydrometallurgical circuit already producing high‑purity cathode for the US market. The brownfield site, in operation for over 15 years and acquired by Mariana in late 2025, is being re‑engineered around autonomous haulage and drilling, with refinery process control also targeted for high levels of automation. For engineers, the key shift is retrofitting autonomy into established pit geometries, leach pad layouts and plant circuits rather than designing greenfield infrastructure.
Technical Brief
- Existing heap bioleaching operation is being retained as the primary leach method rather than conventional SX-EW.
- Hydrometallurgical refining circuit is configured to produce high-purity copper cathode suitable for direct US offtake.
- Brownfield open pit geometry and haul road alignments constrain how autonomous haulage routes can be overlaid.
- Legacy heap pad stacking patterns and solution collection systems must be integrated with autonomy-ready stacking and reclaim equipment.
- Control philosophy is shifting towards refinery-wide advanced process control rather than isolated loop optimisation.
- For other brownfield mining sites, the project offers a live test case for autonomy retrofits without major re-excavation.
Our Take
With Copper One in Utah targeting an autonomy-first mine and refinery for copper, it sits alongside Boliden’s “green fleet” roll-out in Europe as one of the few copper stories in our database explicitly tying fleet modernisation to decarbonisation and productivity in both mining and downstream processing.
The site’s 15+ years of prior operation before Mariana Minerals’ 2025 acquisition suggests a brownfield automation strategy, which typically allows faster deployment of autonomous haulage and plant control than greenfield builds because orebody knowledge and basic site infrastructure are already de-risked.
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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