EX-21 4 file003.txt LIST OF SUBSIDIAIRES EXHIBIT 21 SUBSIDIARIES ARCH COAL, INC. Arch Energy Resources, Inc. Arch Reclamation Services, Inc. Arch Western Acquisition Corporation Arch Western Resources, LLC AU Sub LLC Arch Uinta, LLC Arch of Wyoming, LLC Canyon Fuel Company, LLC Mountain Coal Company, LLC State Leases LLC Thunder Basin Coal Company, L.L.C. Ark Land Company Western Energy Resources, Inc. Allegheny Land Company Apogee Coal Company Arch Coal Sales Company, Inc. Arch Coal Terminal, Inc. Ashland Terminal, Inc. Catenary Coal Holdings, Inc. Catenary Coal Company Cumberland River Coal Company Lone Mountain Processing, Inc. Coal-Mac, Inc. Mingo Logan Coal Company Mountain Gem Land, Inc. Mountain Mining, Inc. Hobet Mining, Inc. Julian Tipple, Inc. Mountaineer Land Company P.C. Holding, Inc. Energy Development Co. Paint Creek Terminals, Inc.