SYDNEY -- Anglo-Australian miner Rio Tinto has found high-grade lithium in the waste rock at an existing American mine, potentially paving the way to become the largest producer in the U.S.
Materials
California lithium find offers boon for American security
Rio Tinto to build $10m pilot plant, hoping to be top producer in US
Rio Tinto's borax mine in California where high-grade lithium was found in waste rock. (Photo courtesy of the company)
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