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Cloud Peak Energy Inc. (NYSE: CLD) is a firm headquartered in Gillette, Wyoming which mines coal in the Powder River Basin. The company was formed as a corporate spin-off from Rio Tinto Energy America in 2009. In its 2009 Annual Report Rio Tinto stated that it held a 48.3% stake in Cloud Peak Energy and its directly owned mines. Cloud Peak Energy also has a 50% stake in the Decker Coal Company, which operates the Decker Mine in Montana.