Mining Properties (Tables)

12 Months Ended

Dec. 31, 2017

Mining Properties [Abstract]

Mining Properties

Mining properties consist of the following (in thousands):

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

December 31, 2016	Palmarejo			Rochester			Kensington			Wharf			La Preciosa		Joaquin		Other			Total
Mine development	$	174,890		$	165,230		$	271,175		$	37,485		$	—	$	—	$	—		$	648,780
Accumulated amortization	(134,995		)	(138,244		)	(154,744		)	(11,699		)	—				—			(439,682		)
	39,895			26,986			116,431			25,786			—		—		—			209,098
Mineral interests	629,303			—			—			45,837			49,085		10,000		37,272			771,497
Accumulated amortization	(381,686		)	—			—			(19,249		)	—		—		(29,370		)	(430,305		)
	247,617			—			—			26,588			49,085		10,000		7,902			341,192
Mining properties, net	$	287,512		$	26,986		$	116,431		$	52,374		$	49,085	$	10,000	$	7,902		$	550,290