Global miner Rio Tinto lowered the acceptance condition on its A$3.9 billion ($4 billion) offer for Riversdale Mining on Tuesday after entering into talks with Brazil's CSN , a major Riversdale shareholder. Rio Tinto's offer of A$16.50 a share is now conditional on securing a minimum 47 percent of Riversdale shares by April 6, compared with 50 percent previously, the bidder said. If it fails to reach the new threshold, Rio Tinto will pay Riversdale shareholders only A$16 a share. ($1 = 0.976 Australian Dollars) (Reporting by Sonali Paul; Editing by Mark Bendeich and Michael Smith)
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