Mining Properties (Tables)

6 Months Ended

Jun. 30, 2018

Mining Properties [Abstract]

Mining Properties

Mining properties consist of the following (in thousands):

June 30, 2018	Palmarejo			Rochester			Silvertip		Kensington			Wharf			La Preciosa		Other			Total
Mine development	$	227,048		$	196,182		$	93,325	$	315,097		$	41,041		$	—	$	—		$	872,693
Accumulated amortization	(155,239		)	(147,968		)	—		(186,204		)	(17,240		)	—		—			(506,651		)
	71,809			48,214			93,325		128,893			23,801			—		—			366,042
Mineral interests	629,303			—			245,116		—			45,837			49,085		7,102			976,443
Accumulated amortization	(455,346		)	—			—		—			(25,343		)	—		(417		)	(481,106		)
	173,957			—			245,116		—			20,494			49,085		6,685			495,337
Mining properties, net	$	245,766		$	48,214		$	338,441	$	128,893		$	44,295		$	49,085	$	6,685		$	861,379

December 31, 2017	Palmarejo			Rochester			Silvertip		Kensington			Wharf			La Preciosa		Total
Mine development	$	214,383		$	193,881		$	57,214	$	298,749		$	40,618		$	—	$	804,845
Accumulated amortization	(146,598		)	(144,390		)	—		(178,632		)	(15,748		)	—		(485,368		)
	67,785			49,491			57,214		120,117			24,870			—		319,477
Mineral interests	629,303			—			245,116		—			45,837			49,085		969,341
Accumulated amortization	(435,215		)	—			—		—			(24,034		)	—		(459,249		)
	194,088			—			245,116		—			21,803			49,085		510,092
Mining properties, net	$	261,873		$	49,491		$	302,330	$	120,117		$	46,673		$	49,085	$	829,569