Cost Of Sales (Tables)

6 Months Ended

Jun. 30, 2012

Cost of Revenue [Abstract]

Cost of Sales

	For the three months ended June 30,					For the six months ended June 30,
	2012			2011		2012			2011
Mining operations costs	$	98,885		$	82,621	$	199,734		$	171,100
Operations costs to metal inventory	(7,830		)	2,231		(11,280		)	(459		)
Mining related depreciation and amortization	25,110			15,490		44,153			36,519
Accretion of asset retirement obligations	705			2,183		1,408			3,116
Total cost of sales	$	116,870		$	102,525	$	234,015		$	210,276