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KEC provides fuel to generate approximately six percent of the nation's electricity and is one of the largest compliance coal producers in the United States. Affiliated with the Rio Tinto group of companies who are leaders in finding, extracting and processing mineral resources, KEC is among the safest and most efficient energy producers in the world. The company operates five western U.S. coal mines: Antelope, Cordero Rojo, Jacobs Ranch and Spring Creek in the Powder River Basin of Wyoming and Montana, as well as the Colowyo Coal Company in Colorado. Holdings also include a 50/50 joint venture interest in Decker Coal, a Montana coal producer.