CSN or Companhia Siderurgica Nacional (NYSE: SID) struck a deal to sell its 19.9 percent stake in Australian coal miner Riversdale to mining giant Rio Tinto for $830 million (AUD$780 million), according to its securities filing. CSN, Brazil’s largest diversified steelmaking company, sold 47.29 million shares of Riversdale at a price of AUD16.50 per share. Earlier in the day, Rio Tinto said it had won control of 72 percent of Riversdale after CSN accepted the offer. Shares of CSN were trading higher by 1.54 percent to $15.85 Wednesday morning. Source: I Stock Analyst