Exhibit 21.1

CORPORATE HIERARCHY

ARCH COAL, INC.

Arch Coal Asia-Pacific PTE. LTD.	100	%
Arch Coal Australia PTY LTD	100	%
Arch Coal Australia Holdings PTY LTD	100	%
Arch Reclamation Services, Inc.	100	%
Arch Western Acquisition Corporation	100	%
Arch Western Resources, LLC	99	%
Arch of Wyoming, LLC	100	%
Arch Western Finance LLC	100	%
Arch Western Bituminous Group LLC	100	%
Canyon Fuel Company, LLC	65	%*
Mountain Coal Company, LLC	100	%
Thunder Basin Coal Company, L.L.C.	100	%
Triton Coal Company, L.L.C.	100	%
Ark Land Company	100	%
Western Energy Resources, Inc.	100	%
Ark Land KH, Inc.	100	%
Ark Land LT, Inc.	100	%
Ark Land WR, Inc.	100	%
Allegheny Land Company	100	%
Apogee Holdco, Inc.	100	%
Arch Coal Sales Company, Inc.	100	%
Arch Energy Resources, LLC	100	%
Arch Coal Terminal, Inc.	100	%
Arch Coal West, LLC	100	%
Arch Development, LLC	100	%
Arch Receivable Company, LLC	100	%
Ashland Terminal, Inc.	100	%
Canyon Fuel Company, LLC	35	%*
Catenary Coal Holdings, Inc.	100	%
Cumberland River Coal Company	100	%
Lone Mountain Processing, Inc.	100	%
Catenary Holdco, Inc.	100	%
Coal-Mac, Inc.	100	%
Energy Development Co.	100	%
Hobet Holdco, Inc.	100	%

Jacobs Ranch Holdings I LLC	100	%
Jacobs Ranch Holdings II LLC	100	%
Jacobs Ranch Coal LLC	100	%
Mingo Logan Coal Company	100	%
Mountain Gem Land, Inc.	100	%
Mountain Mining, Inc.	100	%
Mountaineer Land Company	100	%
Otter Creek Coal, LLC	100	%
P.C. Holding, Inc.	100	%
Prairie Holdings, Inc.	100	%
Prairie Coal Company, LLC	100	%
Saddleback Hills Coal Company	100	%

* NOTE: Canyon Fuel is listed in two places