Keystone Rock & Excavation S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 12.1

Schedule of Computation of Ratio of Earnings to Fixed Charges

	Years Ended December 31,												Three Months Ended March 31,
	2008		2009			2010			2011		2012		2012		2013
Earnings:
Income (loss) before income taxes and cumulative effect of accounting change	$	104,538	$	(41,848	)	$	(20,804	)	$	53,969	$	116,453	$	38,251	$	24,232
Interest expense		35,903		55,857			72,307			86,192		93,200		22,406		23,697
(Gain)/loss on investment in equity investees in excess of distributed earnings		—		164			2,243			—		361		163		119
Amortization of capitalized interest		—		152			267			170		115		22		78
Loan cost amortization		—		—			—			523		2,906		727		726
Earnings	$	140,441	$	14,325		$	54,013		$	140,854	$	213,035	$	61,569	$	48,852
Fixed Charges:
Interest expense	$	35,903	$	55,857		$	72,307		$	86,192	$	93,200	$	22,406	$	23,697
Capitalized interest		2,040		2,764			593			883		2,249		259		676
Loan cost amortization		—		—			—			523		2,906		727		726
Fixed Charges	$	37,943	$	58,621		$	72,900		$	87,598	$	98,355	$	23,392	$	25,099
Ratio of Earnings to Fixed Charges		3.7		0.2			0.7			1.6		2.2		2.6		1.9
Insufficient Coverage	$	—	$	44,296		$	18,887		$	—	$	—	$	—	$	—