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Rio Tinto studies lithium expansion Save Share Rio Tinto’s plan to make lithium treasure from the trash at its Californian borates mine is gathering pace, with the miner studying an expansion to a scale that would generate annual revenues of more than $US60 million at current commodity prices. Rio announced in 2019 that it would spend $10 million trialling whether it could produce battery grade lithium carbonate from the 90 years of waste rock that has built up at the Boron mine. The $10 million pilot plant is now producing at a rate of 10 tonnes per year and Rio’s minerals chief executive Sinead Kaufman said it would run throughout this year to inform a study into a commercial plant capable of producing “at least 5000 tonnes per year”.

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