Cost Of Sales (Tables)

9 Months Ended

Sep. 30, 2012

Cost of Revenue [Abstract]

Cost of Sales

	For the three months ended September 30,					For the nine months ended September 30,
	2012			2011		2012			2011
Mining operations costs	$	98,686		$	87,387	$	298,420		$	258,487
Operations costs to metal inventory	(4,322		)	1,310		(15,602		)	851
Mining related depreciation and amortization	25,832			15,504		69,985			52,023
Accretion of asset retirement obligations	703			2,184		2,111			5,300
Total cost of sales	$	120,899		$	106,385	$	354,914		$	316,661