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Gunnison becomes newest US copper producer

Market News, Mining
TSX:GCU
03 September 2025 11:05 (EST)

Harvesting copper cathode from an electrowinning cell at the Johnson Camp mine. (Source: Gunnison Copper)

Gunnison Copper (TSX:GCU) has initiated production of pure copper cathode from its Johnson Camp mine in Arizona following the successful start-up of the solvent extraction and electrowinning circuit in early August.

This content has been prepared as part of a partnership with Gunnison Copper Corp., and is intended for informational purposes only.

Management is ramping up production towards name plate capacity of 25 million pounds of copper cathode per year with support from Nuton, a Rio Tinto venture that fully funded the restart and holds the right to deploy its next-gen copper leaching technology at the mine.

The company’s nearby Gunnison copper project is estimated to contain measured and indicated resources of 831.6 million tons grading 0.31 per cent copper. The project produced a 2024 preliminary economic assessment with a net present value of US$1.3 billion and a payback period of only 4.1 years. 

Leadership insights

“This is an incredible moment for Gunnison and for US copper supply. To bring Johnson Camp into production ahead of schedule and with an excellent health and safety record is an achievement we’re extremely proud of,” Stephen Twyerould, Gunnison Copper’s president and chief executive officer (CEO), said in a statement. “Even more exciting is that we are now producing 100 per cent American-made copper at a time when our nation needs it most. We extend our gratitude to our dedicated team, valued stakeholders and especially Nuton, a Rio Tinto venture, whose critical support made this possible.”

“We congratulate Gunnison Copper and its dedicated team on this important milestone and are proud to support the company’s efforts in revitalizing mining in Arizona,” added Adam Burley, Nuton’s CEO. “We look forward to first copper production using Nuton technologies later this year, unlocking copper through innovation and partnership.”

About Gunnison Copper

Gunnison Copper is a pure-play copper developer and producer in control of Arizona’s Cochise mining district, which contains 12 known deposits within an 8-kilometre radius.

The copper stock (TSX:GCU) is down by 1.89 per cent on the news trading at C$0.26 as of 10:23 am ET. Shares have added 73.33 per cent year-over-year.

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