Alcoa Corporation, together with its subsidiaries, produces and sells bauxite, alumina, and aluminum products in the United States, Spain, Australia, Iceland, Norway, Brazil, Canada, and internationally. The company operates through two segments, Alumina and Aluminum. It engages in bauxite mining operations; and processes bauxite into alumina and sells it to customers who process it into industrial chemical products, as well as aluminum smelting and casting businesses. The company offers primary aluminum in the form of alloy ingot or value-add ingot to customers that produce products for the transportation, building and construction, packaging, wire, and other industrial markets; and flat-rolled aluminum in the form of sheet, which is sold primarily to customers that produce beverage and food cans. In addition, it owns hydro power plants that generates and sells electricity in the wholesale market to traders, large industrial consumers, distribution companies, and other generation companies. The company was formerly known as Alcoa Upstream Corporation and changed its name to Alcoa Corporation in October 2016. The company was founded in 1886 and is headquartered in Pittsburgh, Pennsylvania.

Alliance Resource Partners, L.P., a diversified natural resource company, produces and markets coal primarily to utilities and industrial users in the United States. The company operates through four segments: Illinois Basin Coal Operations, Appalachia Coal Operations, Oil & Gas Royalties, and Coal Royalties. It produces a range of thermal and metallurgical coal with sulfur and heat contents. The company operates seven underground mining complexes in Illinois, Indiana, Kentucky, Maryland, Pennsylvania, and West Virginia. In addition, it owns and leases oil and gas mineral interests and equity interests; and leases its coal mineral reserves and resources to its mining complexes; and leases land and operates a coal loading terminal on the Ohio River at Mt. Vernon, Indiana. Further, the company offers various mining technology products and services, including data network, communication and tracking systems, mining proximity detection systems, industrial collision avoidance systems, and data and analytics software. It also exports its products. The company was founded in 1971 and is headquartered in Tulsa, Oklahoma.

CONSOL Energy Inc., together with its subsidiaries, produces and sells bituminous coal in the United States and internationally. It operates through two segments, Pennsylvania Mining Complex (PAMC) and CONSOL Marine Terminal. The company's PAMC segment engages in the mining, preparing, and marketing of bituminous coal to power generators, industrial end-users, and metallurgical end-users. This segment includes the Bailey Mine, the Enlow Fork Mine, the Harvey Mine, and the central preparation plant. Its CONSOL Marine Terminal segment provides coal export terminal services through the Port of Baltimore. The company also develops and operates the Itmann Mining Complex located in Wyoming County, West Virginia; and Greenfield Reserves and Resources located in the Northern Appalachian, Central Appalachian, and Illinois basins. CONSOL Energy Inc. was founded in 1864 and is headquartered in Canonsburg, Pennsylvania.

Warrior Met Coal, Inc. engages in the production and export of non-thermal steelmaking metallurgical coal for the steel production by metal manufacturers in Europe, South America, and Asia. The company offers hard-coking coal through the operation of underground mines located in Alabama. It also sells natural gas, which is extracted as a byproduct from coal production. The company was incorporated in 2015 and is headquartered in Brookwood, Alabama.

Arch Resources, Inc. engages in the production and sale of metallurgical products. It operates in two segments, Metallurgical and Thermal. The company operates active mines. It owned or controlled primarily through long-term leases of coal land in Ohio, Maryland, Virginia, West Virginia, Wyoming, Kentucky, Montana, Pennsylvania, Colorado, and Illinois; and smaller parcels of property in Alabama, Indiana, Washington, Arkansas, California, Utah, and Texas. The company sells its products to utility, industrial, and steel producers in the United States and internationally. Arch Resources, Inc. was incorporated in 1969 and is headquartered in Saint Louis, Missouri.

Ramaco Resources, Inc. engages in the development, operation, and sale of metallurgical coal. Its development portfolio includes the Elk Creek project that covers an area of approximately 20,200 acres located in southern West Virginia; the Berwind property covering an area of approximately 62,500 acres situated on the border of West Virginia and Virginia; the Knox Creek property, which covers an area of approximately 64,050 acres is located in Virginia; the Maben property covering an area of approximately 28,000 acres situated in southwestern Pennsylvania southern West Virginia; and the Brook Mine property that covers an area of approximately 16,000 acres located in northeastern Wyoming. The company serves blast furnace steel mills and coke plants in the United States, as well as metallurgical coal consumers internationally. Ramaco Resources, Inc. was founded in 2015 and is headquartered in Lexington, Kentucky.

American Resources Corporation, together with its subsidiaries, extracts, processes, transports, and sells metallurgical coal to the steel and industrial industries. It supplies raw materials; and sells coal used in pulverized coal injections. The company was founded in 2006 and is headquartered in Fishers, Indiana.

Westwater Resources, Inc. operates as an energy technology company, focuses on developing battery-grade natural graphite materials. The company holds interests in Kellyton Graphite Plant located in Kellyton, Alabama; and Bama Mine Project situated in south Alabama. It holds interests in Coosa graphite project located in Coosa County, Alabama. The company was formerly known as Uranium Resources, Inc. and changed its name to Westwater Resources, Inc. in August 2017. Westwater Resources, Inc. was incorporated in 1977 and is headquartered in Centennial, Colorado.