Rio Tinto sells $3.5bn stake in Grasberg mine to Indonesian state miner

World’s No.2 miner Rio Tinto (ASX, LON, NYSE: RIO) said Thursday it had sold its 40% stake in the giant Grasberg mine, the world’s second largest copper operation, to Indonesia's state mining company PT Indonesia Asahan Aluminium (Inalum) for $3.5 billion....