Rio Tinto buys CSN's Riversdale stake for $830m

Brazilian steelmaker CSN (CSNA3.SA: Quote)(SID.N: Quote) struck a deal to sell its 19.9 percent stake in Australian coal miner Riversdale to mining giant Rio Tinto for A$780 million ($830 million), according to a securities filing. Sao Paulo-based CSN, Brazil's largest...