Global miner Rio Tinto failed to win a majority stake in Riversdale Mining with its A$3.9 billion ($4 billion) sweetened offer, it said on Tuesday. Rio Tinto reached 41.04 percent by its late Monday deadline. The offer was due to revert to A$16 a share from A$16.50, remaining open until April 6, if Rio did not reach 50 percent by 0800 GMT on Monday. ($1 = 0.976 Australian Dollars) (Reporting by Sonali Paul; Editing by Mark Bendeich)
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