Global miner Rio Tinto is negotiating with Brazil's CSN to secure a majority stake in Africa-focused miner Riversdale , a source familiar with the situation said Tuesday. Rio earlier announced it expected an outcome of talks with one of Riversdale's two big shareholders on Tuesday but did not specify which stakeholder was involved. Rio may need CSN's backing to save its A$3.9 billion ($4 billion) takeover offer for Riversdale. CSN owns 19.9 percent of Riversdale, and Rio Tinto has managed so far to secure about 41 percent of the Australia-listed firm. CSN was not immediately available for comment.
Source
