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A worker climbs the stairs of a mining shovel machine bearing the... News PhotoClimbing,Copper,Copper Mine,Delivering,Finance,Horizontal,Logo,Machinery,Man Made Object,Metal,Mexico,Mine,Mining,North America,Occupation,Steps and Staircases,Symbol,The Americas,USAPhotographer Collection: Bloomberg 2013 BloombergA worker climbs the stairs of a mining shovel machine bearing the logo of Southern Copper Corp., a subsidiary of Grupo Mexico SAB, at Grupo Mexico'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