In this July 6, 2012 photo, pieces of coal lay in a pile at the Erdenes Tavan Tolgoi, a coal mining company in Tavan Tolgoi, southern Mongolia. Chinese demand for copper and especially coal has propelled the Mongolian economy to one of the world's fastest growing, making some wealthy and driving down poverty in a still poor country, and China wants a larger share of the resources. (AP Photo/Andy Wong)

Associated Press
In this July 6, 2012 photo, pieces of coal lay in a pile at the Erdenes Tavan Tolgoi, a coal mining company in Tavan Tolgoi, southern Mongolia. Chinese demand for copper and especially coal has propelled the Mongolian economy to one of the world's fastest growing, making some wealthy and driving down poverty in a still poor country, and China wants a larger share of the resources. (AP Photo/Andy Wong)
In this July 6, 2012 photo, pieces of coal lay in a pile at the Erdenes Tavan Tolgoi, a coal mining company in Tavan Tolgoi, southern Mongolia. Chinese demand for copper and especially coal has propelled the Mongolian economy to one of the world's fastest growing, making some wealthy and driving down poverty in a still poor country, and China wants a larger share of the resources. (AP Photo/Andy Wong)
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