BRIEF-RESEARCH ALERT-SocGen raises BHP Billiton to buy, Antofagasta to hold

SOCGEN RAISES BHP BILLITON PLC TO BUY FROM HOLD; TARGET PRICE TO 1,900P from 1,650P SOCGEN RAISES ANTOFAGASTA PLC TO HOLD FROM SELL SOCGEN RAISES ANGLO AMERICAN PLC TARGET PRICE TO 2,400P FROM 1,800P; rating buy SOCGEN RAISES XSTRATA PLC PRICE TARGET TO