Mining Properties (Tables)

12 Months Ended

Dec. 31, 2011

Mining Properties [Abstract]

Mining Properties

December 31, 2011	San Bartolomé			Martha			Palmarejo			Rochester			Endeavor			Kensington			Other		Total
Operational mining properties:	$	68,684		$	12,644		$	134,296		$	112,826		$	—		$	321,456		$	—	$	649,906
Accumulated depletion		(14,989	)		(10,373	)		(53,060	)		(97,834	)		—			(27,160	)		—		(203,416	)
		53,695			2,271			81,236			14,992			—			294,296			—		446,490
Mineral interest		26,642			—			1,658,389			—			44,033			—			—		1,729,064
Accumulated depletion		(6,007	)		—			(158,627	)		—			(10,034	)		—			—		(174,668	)
		20,635			—			1,499,762			—			33,999			—			—		1,554,396
Non-producing and development properties		—			—			—			—			—			—			142		142
Total mining properties	$	74,330		$	2,271		$	1,580,998		$	14,992		$	33,999		$	294,296		$	142	$	2,001,028
December 31, 2010	San Bartolomé			Martha			Palmarejo			Rochester			Endeavor			Kensington			Other		Total
Operational mining properties:	$	66,655		$	10,096		$	128,734		$	99,720		$	—		$	317,156		$	—	$	622,361
Accumulated depletion		(10,031	)		(9,998	)		(22,655	)		(97,435	)		—			(9,092	)		—		(149,211	)
		56,624			98			106,079			2,285			—			308,064			—		473,150
Mineral interest		26,642			—			1,657,188			—			44,033			—			—		1,727,863
Accumulated depletion		(4,027	)		—			(68,026	)		—			(6,886	)		—			—		(78,939	)
		22,615			—			1,589,162			—			37,147			—			—		1,648,924
Non-producing and development properties		—			—			—			—			—			—			142		142
Total mining properties	$	79,239		$	98		$	1,695,241		$	2,285		$	37,147		$	308,064		$	142	$	2,122,216