Natural Resource Partners L.P. is engaged principally in the business of owning, managing and leasing mineral properties in the United States. It owns coal reserves in Appalachia, the Illinois Basin and the Western United States, as well as lignite reserves in the Gulf Coast region. The Company’s operations are conducted through, and its operating assets are owned by, its subsidiaries. The Company owns its subsidiaries through a wholly owned operating company, NRP (Operating) LLC. NRP (GP) LP, which is its general partner and through which the Company conducts its business and manages its operations. Because the Company’s general partner is a limited partnership, GP Natural Resource Partners LLC conducts its business and operations. Robertson Coal Management LLC owns all of the membership interest in GP Natural Resource Partners LLC.