Obama And South Korean President Park Geun-hye Meet, Hold Joint News Conference

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A worker operates a mining shovel machine at Grupo Mexico SAB's La... News PhotoCopper,Copper Mine,Delivering,Finance,Horizontal,Machinery,Man Made Object,Metal,Mexico,Mine,Mining,North America,Occupation,The Americas,USAPhotographer Collection: Bloomberg 2013 BloombergA worker operates a mining shovel machine 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