Cloud Peak Energy Inc. produces coal in the Powder River Basin. The company operates through Owned and Operated Mines, and Logistics and Related Activities segments. It owns and operates three surface coal mines, including the Antelope Mine and the Cordero Rojo Mine located in Wyoming; and the Spring Creek Mine located in Montana, which produce subbituminous thermal coal with low sulfur content. The company sells its coal primarily to domestic and foreign electric utilities. As of December 31, 2018, it controlled approximately 977.3 million tons of proven and probable reserves. The company also has two development projects comprising the Youngs Creek project, an undeveloped surface mine project located in Wyoming; and the Big Metal project located in southeast Montana. In addition, it offers logistics and related services, such as the purchase of coal from third parties, as well as the contracting and coordination of the transportation and other handling services from third-party operators. Cloud Peak Energy Inc. was founded in 1993 and is headquartered in Gillette, Wyoming. On May 10, 2019, Cloud Peak Energy Inc. along with its affiliates, filed a voluntary petition for reorganization under Chapter 11 in the U.S. Bankruptcy Court for the District of Delaware.