Rio Tinto’s Nuton technology produces first copper

(Posted on 09/12/25)

Rio Tinto has successfully produced the first copper from the Johnson Camp mine in Arizona using its Nuton Technology, marking a pivotal step forward in the development of this innovative copper processing technology.

After more than 30 years of research and development, the first copper cathode using Rio Tinto’s proprietary bioleaching technology, which relies on microorganisms grown on site, was produced at Gunnison Copper’s Johnson Camp mine last month. The deployment involves the design and delivery of a technology package for a heap leach pad targeting production of approximately 30,0001 tonnes of refined copper over a four-year demonstration period. Rio Tinto is engaging with several potential customers in the U.S. to support the domestic copper supply chain.

Rio Tinto Copper Chief Executive Katie Jackson said: “This is a breakthrough achievement for our Nuton technology, which is proving that cleaner, faster, and more efficient copper production is possible at an industrial scale. In an industry where projects typically take about 18 years to move from concept to production, Nuton has now proven its ability to do this in just 18 months.

“Nuton has designed a modular system deployed as a technology package integrating biology, chemistry, engineering, and digital tools, allowing it to be rapidly scaled and tailored to different ore bodies, unlocking resources that have historically been considered uneconomic or challenging. We are actively partnering on projects in North and South America to assess the potential for future deployment at additional sites in the coming years.”

Nuton relies on naturally occurring microorganisms to extract copper from primary sulphide ores, which are traditionally difficult to process. These microbes, grown at large scale in Nuton’s proprietary bioreactors, accelerate the oxidation of minerals in the crushed ore heap, generating heat and enabling copper to dissolve into a leach solution, which is then processed into 99.99% pure copper cathode.

Significantly, processing copper ore with Nuton eliminates the need for concentration, smelting and refining, shortening supply chains and delivering copper cathode at the mine gate. It achieves recovery rates of up to 85% from primary sulphides, the most abundant copper bearing ores in the world.

Nuton can also extend mine life and maximize resource use by extracting value from ores that would otherwise be classified as waste, increasing yield and revenue at both new and existing mines. Its environmental performance is expected to exceed conventional copper processing technologies, with up to 80% less water usage and up to 60% lower carbon emissions than the traditional concentrator route.

At Johnson Camp, Nuton aims to produce copper with the lowest carbon footprint in the U.S. Through the purchase of 134,000 Green-e Energy certified renewable energy certificates, Nuton ensures 100% of the site’s electricity is matched by renewable sources. The copper produced is anticipated to have a mine-to-metal carbon footprint of 0.82-kilogram CO?-e per kilogram copper, the lowest in the U.S. and substantially lower than the projected 2026 global average of 3.4 kilograms CO?-e per kilogram among operating copper mines.

Latest News

Pilbara production record as Rio Tinto releases Q2 results

Rio Tinto has driven performance to achieve 3% YoY CuEq1 growth in the first half of 2026.Chief Executive... Read more

Record iron ore production helps strengthen BHP growth pipeline

BHP have released its Operational Review for the year ended 30 June 2026.Chief Executive Officer, Brandon... Read more

Stranded sulphur cargoes in Gulf face mounting corrosion risk, warns Brookes Bell

Bulk carriers carrying elemental sulphur cargoes in the Strait of Hormuz are at significant risk of... Read more

BHP and Faraday Copper sign definitive San Manuel agreement

Further to BHP’s announcement in February, BHP, through a wholly owned subsidiary, has executed... Read more

Urea price dive hits Australian grain suppliers

Australia’s Federal Government's fertiliser support package has come under scrutiny as global... Read more

SSAB pauses work at construction site in Luleå

SSAB has once again paused work at the construction site for its new steel mill in Luleå, Sweden... Read more

Trafigura issues USD500 million senior bond

Trafigura Group Pte Ltd. has announced the issuance of a USD500 million senior Reg S bond with a five... Read more

NGFA welcomes Senate Farm Bill proposal

The National Grain and Feed Association (NGFA) in the USA has welcomed the release of Senate Agriculture... Read more

Agreement paves way to deliver 2.7 million tonnes of additional copper production

Anglo American plc, through its 50.1%-owned subsidiary, Anglo American Sur S.A., and Codelco, have announced... Read more

SSAB and partners launch closed loop steel recycling initiative in US

SSAB Americas, The Greenbrier Companies and Alter Trading are partnering on a circular economy project... Read more