- Alabama By-Products Corporation
- Alberici Constructors
- Allegheny Power Service Corporation
- Alliance Resource Partners, LLC
- Allied Chemical Corporation
- Allmineral
- Alpha Natural Resources
- American Bituminous Power Panthers
- American Electric Power Service Corporation
- American LimeStone Company
- Anker Energy Corporation
- Arch Coal
- Argos Cement
- Armco Steel Corporation
- Barnes and Tucker Coal Company
- Bethlehem Mines Corporation
- Black Mountain Sand
- Buchanan Minerals, LLC
- Calgon Carbon
- Cannelton Industries, Inc.
- Carter Roag Coal Company
- Catenary Coal Company
- CII Carbon
- CNX Marine Terminal
- Consol Docks, Inc.
- Consolidation Coal Company and Divisions
- Eastern Region - Pennsylvania
- Eastern Region - West Virginia
- Maintenance Engineering Department
- Midwestern Region - Illinois
- Midwestern Region - Ohio
- Northern West Virginia Region
- Southern Appalachia Region
- Continental Oil Company
- Coronado Coal
- Covol Engineered Fuels, LLC
- DTE Energy Services, Inc.
- Diamond Shamrock Corporation
- Drummond Company, Inc.
- Eastern Associated Coal Corp.
- ERP Fuels
- Eriez Manufacturing
- Federal Paper Board, Inc.
- First Energy Generation Corp.
- The Florence Mining Company
- FMC Corporation
- Foundation Coal
- Frontier Kemper Constructors
- Greer Limestone
- Headwaters, Inc.
- Hobet Mining, Inc.
- Holmes Limestone Company
- International Coal Group
- Island Creek Coal Company
- JG Contracting
- Johnstown Coal and Coke Company
- Jones & Laughlin Steel Corporation
- Kemper Equipment Corporation
- Kentucky Stone Company
- Laurel Aggregates
- Lehigh Northeast Cement Company
- Lhoist North America
- Maben Energy Corporation
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- Macoupin Energy
- Marigold Land Company
- Martinka Coal Company
- MEC Construction
- Mingo Logan Coal Company
- Mississippi Lime Corporation
- Monongahela Power Company
- The Nacco Mining Company
- National Mines Corporation
- The North American Coal Corporation
- North Central Resources, Inc.
- The Oneida Mining Company
- Old Ben Coal Company
- Panther Creek Partners, Inc.
- Patriot Mining Company
- Peabody Coal Company
- Pennsylvania Power and Light Company
- Pennsylvania Mines Corporation
- PinnOak Resources, Inc.
- Pittsburg & Midway Coal Mining
- The Pittston Coal Group
- Amigo Smokeless Coal Company
- Badger Coal Company
- Buffalo Mining Company
- Clinchfield Coal Company
- Eastern Coal Corporation
- Elkay Mining Company
- Jewell Ridge Coal Corporation
- Kentland Elkhorn Coal Corporation
- Ranger Fuel Corporation
- Sewell Coal Company
- Preston Energy, Inc.
- Quarto Mining Company
- RAG Emerald Resources
- RAG Cumberland Resources
- RAG Twentymile Coal Company
- Ravenswood Aluminum Corporation
- Republic Steel Corporation
- Rochester & Pittsburgh Coal Company
- Rockspring Development
- Semet Solvay
- Sohio Oil Company
- Sovereign Coal Company
- Sugar Camp Energy
- SunCoke Energy
- Turnkey Processing Solutions
- United Coal Company
- United States Steel Corporate and Divisions
- Gary District (West Virginia)
- Frick District (Pennsylvania)
- Lynch District (Kentucky)
- Southern District (Alabama)
- Western District (Utah)
- Virginia Concrete Company
- Vulcan Materials Company
- Wimpey Materials, Inc.
- Wellmore Coal Company
- Westmoreland Coal Company
- Youghiogheny & Ohio Coal Company
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