Arcadium deal could power Rio Tinto's entry into lithium supplier big league

Oct 8 (Reuters) - Rio Tinto (RIO.L), opens new tab, (RIO.AX), opens new tab is in talks to buy lithium producer Arcadium Lithium (ALTM.N), opens new tab, pursuing a deal that could make the Anglo-Australian miner the third-largest producer of the electric-vehicle battery metal.

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