Exhibit 12.1

Computation of Ratio of Earnings to Combined Fixed Charges and Preference Dividends

	Three Months Ended March 31
	2008			2007
Earnings:
Pretax income excluding income or loss from equity investments	$	96,675		$	33,664
Adjustments:
Fixed charges		23,178			22,932
Distributed income from equity investments		545			—
Capitalized interest, net of amortization		(1,183	)		(5,101	)
Arch Western Resources, LLC dividends on preferred membership interest		(29	)		(28	)
Total earnings	$	119,186		$	51,467
Fixed charges:
Interest expense	$	20,488		$	17,258
Capitalized interest		2,073			5,181
Arch Western Resources, LLC dividends on preferred membership interest		29			28
Portions of rent which represent an interest factor		588			465
Total fixed charges	$	23,178		$	22,932
Preferred stock dividends		18			44
Total fixed charges and preferred stock dividends	$	23,196		$	22,976
Ratio of earnings to combined fixed charges and preference dividends		5.14x			2.24x