Coal dust accumulates in a silo in Yangchangwan coal mine, part of Shenhua group, in Ning Dong, near Yinchuan, Ningxia province, China, on July 10, 2006. China Shenhua Energy is planning the world's biggest share sale by a coal mining company, hoping to raise as much as $6.3 billion to expand pits and delivery networks as demand for the fuel surges. Photo by Servais Mont/Pictobank
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