Foresight Energy LP is engaged in the mining and marketing of coal from reserves and operations located in the Illinois Basin. As of December 31, 2016, the Company controlled 2.1 billion tons of coal in the state of Illinois. Its reserves consist principally of three contiguous blocks of uniform, thick, high heat content (high Btu) thermal coal, which are used for longwall operations. The Company operates four underground mining complexes in the Illinois Basin, including Williamson, Sugar Camp, Hillsboro and Macoupin. Its mining complexes operate in the Illinois Basin with approximately two located in Southern Illinois and over two located in Central Illinois. Williamson, Sugar Camp and Hillsboro are longwall operations, and Macoupin is a continuous miner operation. The Company markets and sells its coal to electric utility and industrial companies in the eastern half of the United States as well as internationally (primarily into Europe).