America Just Got a New Copper Producer. Rio Tinto Is Backing Them.
Gunnison Copper is already mining and selling 100% American copper out of Arizona, and the timing couldn't be better
Not investment advice. Disseminated on behalf of Gunnison Copper Corp.
(TSX: GCU | OTCQB: GCUMF | FSE: 3XS0)
In the world of junior mining, most companies never make it to production. They find something interesting in the ground, they drill it, they publish studies, they raise capital, and then they spend years trying to get permitted, financed, and built. The vast majority never cross the finish line.
Gunnison Copper (🇨🇦GCU / 🇺🇸GCUMF) already did.
The Johnson Camp Mine in Arizona entered production in August 2025, ahead of schedule. By September, Gunnison had delivered its first 225,000 pounds of copper cathode into U.S. markets, generating over $1 million in gross proceeds. This isn’t a company talking about what it might do someday. It’s a company that is mining and selling copper right now.
Every single pound of it is produced in the United States. And Rio Tinto is backing the operation.
Copper above $6 a pound, and the supply picture just got worse
The macro backdrop Gunnison is producing into is about as favorable as it gets.
Copper prices have surged above US$6 per pound. Demand is being driven by electric vehicles, AI data centers, power grid buildouts, and defense manufacturing. A single large data center can use one to two million pounds of copper. With AI infrastructure accelerating across the country, the demand from tech alone is staggering.
Meanwhile, supply just took a hit. Freeport-McMoRan’s Grasberg mine in Indonesia, the world’s second-largest copper operation, recently suffered a catastrophic disruption that took 35% of its output offline through at least 2026. The market was already tight. Now it’s tighter.
New copper supply is notoriously difficult to bring online. Permitting takes years. Construction takes years. Ramp-up takes years. Gunnison skipped that entire queue by being already in production, in a mining-friendly U.S. state, with nameplate capacity of 25 million pounds per year.
Rio Tinto’s Nuton technology, deployed at industrial scale
The Johnson Camp Mine isn’t running on conventional processing. It’s powered by Nuton, a proprietary bioleaching technology developed by Rio Tinto’s venture arm. Nuton uses naturally occurring microorganisms to extract copper from sulphide material, producing 99.99% pure copper cathode right at the mine gate. No smelters. No refineries. A shorter, cleaner supply chain with lower carbon emissions and less water use.
When Rio Tinto puts their technology and financial backing behind a junior producer, that’s a signal worth paying attention to. This isn’t a small-scale experiment. Nuton is now deployed at industrial scale at Johnson Camp.
And here’s where it gets even more interesting: in January 2026, Rio Tinto’s Nuton announced a collaboration with Amazon Web Services. AWS is using the first copper ever produced by this technology in components of its U.S. data centers. That means Gunnison’s copper is already flowing into one of the largest infrastructure buildouts on the planet.
Pentagon recognition and the made-in-America advantage
Gunnison was recently granted membership in the Defense Industrial Base Consortium, an invitation-only U.S. Department of Defense initiative focused on strengthening domestic supply chains for critical minerals tied to national security. That gives Gunnison potential access to non-dilutive government funding, strategic partnerships, and programs designed to accelerate domestic copper production.
With the U.S. government pouring billions into reshoring critical mineral supply chains, a company that produces 100% American copper, backed by one of the world’s largest miners, with Pentagon recognition, sits directly in the path of that policy push.
Johnson Camp is just the starting point
Production from Johnson Camp is the headline. But the bigger story is what Gunnison controls underneath it.
The company holds a large portion of the entire Cochise Mining District in Arizona, a historic copper camp with 12 known deposits spread across an 8-kilometer corridor. The larger Gunnison Project hosts over 846 million tons of copper resources. A 2026 Preliminary Economic Assessment outlined $2.0 billion in projected net present value at an 8% discount rate, a 23% internal rate of return, and a 3.9-year payback period. If fully developed, the project could supply up to 8% of America’s total copper demand.
Johnson Camp proves the team can produce. The district-scale resource is what makes the long-term story compelling.
Note: The PEA is preliminary in nature and includes Inferred Mineral Resources that are too speculative to be categorized as mineral reserves. There is no certainty that the PEA conclusions will be realized.
Exploration tech that came from space
Gunnison has also partnered with Tucson-based defense-tech startup Lunasonde to deploy airborne georadiotomography across the Cochise Mining District. This is technology originally developed for scanning beneath the surface of planets and asteroids, now being used to look for copper-bearing structures hidden beneath Arizona’s alluvial cover. The survey is complete and initial results are expected soon.
If successful, it could expand an already massive resource base using technology that most mining companies don’t have access to.
The valuation…
Established Arizona copper producers command multi-billion-dollar valuations. Gunnison is producing copper, backed by Rio Tinto, has eliminated its secured debt, deployed Nuton at industrial scale, and released improved economics in its 2026 PEA. The market cap sits around US$130 million.
The company’s price-to-net-asset-value is approximately 0.15, while Southern Arizona peers trade around 0.45. For a company that’s already generating revenue from copper sales, that’s a gap worth examining.
The bottom line
Gunnison Copper (🇨🇦GCU / 🇺🇸GCUMF) is one of the newest copper producers in America, already mining and selling copper from a real mine in Arizona, backed by Rio Tinto’s technology, with its product flowing into Amazon data centers and Pentagon-recognized supply chains.
Copper is above $6 a pound. Global supply just got tighter. The U.S. government is spending billions to secure domestic critical minerals. And Gunnison sits on a district-scale resource that a 2026 PEA valued at $2 billion, with production already underway and a market cap under $130 million.
Most junior mining companies talk about what they’ll do when they reach production. Gunnison is already there. That changes the conversation entirely.
The ticker is GCU on the TSX, or GCUMF on the US OTC.
Disclaimer: Disseminated on behalf of Gunnison Copper Corp. This newsletter is for informational purposes only and is not investment advice. It is part of a paid marketing campaign. Cashu Group was compensated by Gunnison Copper Corp. for the creation and distribution of this content. The PEA referenced is preliminary in nature and includes Inferred Mineral Resources that are too speculative to be categorized as mineral reserves. There is no certainty that the PEA conclusions will be realized. Investing in mining companies involves significant risk, including the risk of loss of capital. All project details, production figures, and financial data referenced come from the company’s public disclosures. Always do your own due diligence and consult a licensed financial professional before making investment decisions.