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A group of dump trucks sit parked at Grupo Mexico SAB's La Caridad... News PhotoCopper,Copper Mine,Delivering,Finance,Horizontal,Man Made Object,Metal,Mexico,Mine,Mining,North America,Sitting,Stationary,The Americas,USAPhotographer Collection: Bloomberg 2013 BloombergA group of dump trucks sit parked at Grupo Mexico SAB's La Caridad open pit copper mine in Sonora, Mexico, on Monday, May 6, 2013. Grupo Mexico SAB, Mexico’s biggest mining company by market value, estimates it will produce 840,000 tons of copper in 2013. Photographer: Susana Gonzalez/Bloomberg via Getty Images