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flag Rio Tinto’s Nuton Tech yields 99.99% pure copper at Arizona mine, zero-smelt, renewable-powered.

flag Rio Tinto has produced the first copper using its Nuton Technology at Arizona’s Johnson Camp mine, a breakthrough after 30 years of development. flag The bioleaching process, using on-site microorganisms, generated a 99.99% pure copper cathode without smelting or refining. flag The four-year demonstration aims for 30,000 tonnes of production, with low carbon emissions and water use. flag The project uses 100% renewable energy and could unlock uneconomic deposits and extend mine life.

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