Mining giant Rio Tinto in talks to buy U.S. lithium producer Arcadium CNBCLithium miner Arcadium confirms Rio Tinto takeover approach Yahoo FinanceLithium Stocks Surge on Report Rio Tinto May Be Considering Acquisition InvestopediaInvestor Tells Arcadium to Refuse a Low-Ball Rio Tinto Offer BloombergLive news: Rio Tinto makes approach to acquire Arcadium Lithium Financial Times