Alpha Metallurgical Resources, Inc. is a mining company, which engages in the provision of met and thermal coal. It focuses on met coal mines, including Deep Mine 41, Road Fork 52, Black Eagle, and Lynn Branch. The company was founded on June 26, 2016 and is headquartered in Bristol, TN.

NACCO Industries, Inc. is a holding company, which engages in the management of surface mines that supply coal to power generation companies. It operates through the following segments: Coal Mining, North American Mining (NAMining), and Minerals Management. The Coal Mining segment includes surface coal mines under long-term contracts with power generation companies and activated carbon producers. The NAMining segment offers value-added contract mining and other services for producers of aggregates, lithium, and other minerals. The Minerals Management segment focuses on the development of oil, gas, and coal reserves. The company was founded on February 18, 1986 and is headquartered in Cleveland, OH.

Natural Resource Partners LP engages in the business of owning, managing, and leasing a diversified portfolio of mineral properties. It operates through the Coal Royalty and Other, and Soda Ash segments. The Coal Royalty and Other segment consists of coal royalty properties and coal-related transportation and processing assets. The Soda Ash segment consists of a non-controlling equity interest in a trona ore mining operation and soda ash refinery in the Green River Basin, Wyoming. The company was founded in April 2002 and is headquartered in Houston, TX.

Alliance Resource Partners LP is a natural resource company, which produces and markets coal to United States utilities and industrial users. It operates through the following segments: Illinois Basin, Appalachia, Minerals, and Other & Corporate. The Illinois Basin segment is comprised of Webster County coal's Dotiki mining complex, Gibson mining complex, which includes the Gibson north mine and the Gibson south project, Hopkins County coal's Elk Creek mining complex, White County coal's Pattiki mining complex, Warrior's mining complex, River View's mining complex, the Sebree property and certain properties of Alliance Resource Properties and ARP Sebree LLC. The Appalachian segment is composed of Pontiki and MC Mining complexes. The Minerals segment includes its oil & gas mineral interests, which are located primarily in the Permian, Anadarko, and Williston basins. The Other and Corporate segment includes marketing and administrative expenses, Mt. Vernon dock activities, coal brokerage activity, its equity investment in Mid-America Carbonates LLC and certain activities of Alliance Resource Properties. The company was founded in 1971 and is headquartered in Tulsa, OK.