Mining Properties (Tables)

9 Months Ended

Sep. 30, 2011

Mining Properties [Abstract]

Mining Properties

September 30, 2011	Palmarejo			San Bartolomé			Kensington			Rochester			Martha			Endeavor			Other		Total
Operational mining properties:	$	133,223		$	66,848		$	320,943		$	108,741		$	11,495		$	—		$	—	$	641,250
Accumulated depletion		(45,287	)		(13,694	)		(24,407	)		(97,435	)		(10,067	)		—			—		(190,890	)
		87,936			53,154			296,536			11,306			1,428			—			—		450,360
Mineral interests		1,657,188			26,642			—			—			—			44,033			—		1,727,863
Accumulated depletion		(132,449	)		(5,490	)		—			—			—			(9,283	)		—		(147,222	)
		1,524,739			21,152			—			—			—			34,750			—		1,580,641
Non-producing and development properties		—			—			—			—			—			—			142		142
Total mining properties	$	1,612,675		$	74,306		$	296,536		$	11,306		$	1,428		$	34,750		$	142	$	2,031,143

December 31, 2010	Palmarejo			San Bartolomé			Kensington			Rochester			Martha			Endeavor			Other		Total
Operational mining properties:	$	128,734		$	66,655		$	317,156		$	99,720		$	10,096		$	—		$	—	$	622,361
Accumulated depletion		(22,655	)		(10,031	)		(9,092	)		(97,435	)		(9,998	)		—			—		(149,211	)
		106,079			56,624			308,064			2,285			98			—			—		473,150
Mineral interests		1,657,188			26,642			—			—			—			44,033			—		1,727,863
Accumulated depletion		(68,026	)		(4,027	)		—			—			—			(6,886	)		—		(78,939	)
		1,589,162			22,615			—			—			—			37,147			—		1,648,924
Non-producing and development properties		—			—			—			—			—			—			142		142
Total mining properties	$	1,695,241		$	79,239		$	308,064		$	2,285		$	98		$	37,147		$	142	$	2,122,216