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The Powder River Basin is a region in Wyoming and Montana . Approximately 40% of the United States' coal is extracted from this region. The larger towns include Gillette , Sheridan and Miles City .
There are around 800 billion tons of fatty coal in the soil under this basin . There are natural coal fires in the region .
Individual evidence
↑ John P. Bluemle: North Dakota's Clinker. In: North Dakota Geological Survey. September 28, 2005, accessed April 8, 2019 .