CNX Resources Corporation, an independent natural gas and midstream company, engages in the acquisition, exploration, development, and production of natural gas properties in the Appalachian Basin. The company operates in two segments, Shale and Coalbed Methane (CBM). It produces and sells pipeline quality natural gas primarily for gas wholesalers. The company owns rights to extract natural gas from shale properties in Pennsylvania, West Virginia, and Ohio, as well as rights to extract natural gas from other shale and shallow oil and gas formations in Illinois, Indiana, New York, and Virginia. It also owns rights to extract CBM in Virginia, West Virginia, Pennsylvania, Ohio, Illinois, Indiana, and New Mexico. In addition, the company designs, builds, and operates natural gas gathering systems to move gas from the wellhead to interstate pipelines or other local sales points; owns and operates approximately 2,600 miles of natural gas gathering pipelines, as well as various natural gas processing facilities. It also offers turn-key solutions for water sourcing, delivery, and disposal for its natural gas operations and for third parties. The company was formerly known as CONSOL Energy Inc. and changed its name to CNX Resources Corporation in November 2017. CNX Resources Corporation was founded in 1860 and is headquartered in Canonsburg, 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.

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.

Peabody Energy Corporation engages in coal mining business in the United States, Japan, Taiwan, Australia, India, Brazil, Belgium, Chile, France, Indonesia, China, Vietnam, South Korea, Germany, and internationally. The company operates through Seaborne Thermal, Seaborne Metallurgical, Powder River Basin, Other U.S. Thermal, and Corporate and Other segments. It is involved in the mining, preparation, and sale of thermal coal primarily to electric utilities; mining bituminous and sub-bituminous coal deposits; low sulfur and high British thermal unit thermal coal; and mining metallurgical coal, such as hard coking coal, semi-hard coking coal, semi-soft coking coal, and pulverized coal injection coal. The company supplies coal primarily to electricity generators, industrial facilities, and steel manufacturers. It also engages in marketing and brokering of coal from other coal producers; trading of coal and freight-related contracts, as well as provides transportation-related services. The company was founded in 1883 and is headquartered in Saint Louis, Missouri.

Hallador Energy Company, through its subsidiaries, engages in the production of steam coal in the State of Indiana for the electric power generation industry. The company owns the Oaktown Mine 1 and Oaktown Mine 2 underground mines in Oaktown; Freelandville Center Pit surface mine in Freelandville; and Prosperity Surface mine in Petersburg, Indiana. It is also involved in gas exploration activities in Indiana; and operation of logistics transport facility. Hallador Energy Company was founded in 1949 and is headquartered in Terre Haute, Indiana.

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.

NACCO Industries, Inc., together with its subsidiaries, engages in the natural resources business. The company operates through three segments: Coal Mining, North American Mining, and Minerals Management. The Coal Mining segment operates surface coal mines under long-term contracts with power generation companies. Coal is surface mined in North Dakota and Mississippi. The North American Mining segment provides value-added contract mining and other services for producers of aggregates, activated carbon, lithium, and other industrial minerals; and contract mining services for independently owned mines and quarries in Florida, Texas, Arkansas, Virginia, and Nebraska. This segment also offers mining design and consulting services. The Minerals Management segment is involved in the leasing of its royalty and mineral interests to third-party exploration and production companies, and other mining companies, which grants them the rights to explore, develop, mine, produce, market, and sell gas, oil, and coal. NACCO Industries, Inc. was founded in 1913 and is headquartered in Cleveland, Ohio.

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.