BHP Billiton (BHP) approves a $554M investment in Chile's Escondida copper mine, the world's...

|About: BHP Billiton Limited (BHP)|By:, SA News Editor

BHP Billiton (BHP) approves a $554M investment in Chile's Escondida copper mine, the world's largest, to make improvements that should boost production from 2013. Rio Tinto (RIO) holds a 30% stake in the mine, to BHP's 57.5%. Meanwhile, copper today: -2% to $4.259.