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OXF: Oxford Resource Partners, LP is a low cost producer of high value steam coal in Northern Appalachia and the Illinois Basin. The Partnership markets its coal primarily to large electric utilities with coal-fired, base-load scrubbed power plants under long-term coal sales contracts. As of December 31, 2010, the Partnership controlled 93.5 million tons of proven and probable coal reserves, and it currently operates 22 active surface mines that are managed as eight mining complexes. The Partnership is headquartered in Columbus, Ohio. 

NRP: Natural Resource Partners L.P. is a master limited partnership headquartered in Houston, TX, with its operations headquarters in Huntington, WV. NRP is principally engaged in the business of owning and managing mineral reserve properties. NRP primarily owns coal, aggregate and oil and gas reserves across the United States that generate royalty income for the partnership.

PVR: Penn Virginia Resource Partners, L.P. is a publicly traded limited partnership which owns and manages coal and natural resource properties and related assets, and owns and operates midstream natural gas gathering and processing businesses. PVR has approximately 900 million tons of proven coal reserves in Northern and Central Appalachia, and the Illinois and San Juan Basins; midstream natural gas assets are located principally in Texas, Oklahoma and Pennsylvania and include more than 4,200 miles of natural gas gathering pipelines and 7 processing systems with approximately 420 million cubic feet per day of capacity.