A worker shows mining trucks controlled by a GPS program at Chile's Esperanza copper mine near Calama town, about 1,650 km (1,025 miles) north of Santiago, March 30, 2011. As workers prime crushing mills and tune heavy machinery in Chile's desert north, the world's only major new copper mine to be inaugurated this year hopes to cash in on what looks to be the metal's best year ever. Picture taken March 30, 2011. REUTERS/Ivan Alvarado (CHILE - Tags: BUSINESS EMPLOYMENT SOCIETY)