Mining Properties (Tables)

6 Months Ended

Jun. 30, 2017

Mining Properties [Abstract]

Mining Properties

Mining properties consist of the following (in thousands):

June 30, 2017	Palmarejo			Rochester			Kensington			Wharf				San Bartolomé			La Preciosa		Other			Total
Mine development	$	185,416		$	181,199		$	286,801		$	37,818			$	39,423		$	—	$	—		$	730,657
Accumulated amortization	(139,170		)	(141,026		)	(165,193		)	(13,476		)		(33,094		)	—		—			(491,959		)
	46,246			40,173			121,608			24,342				6,329			—		—			238,698
Mineral interests	629,303			—			—			45,837				12,868			49,085		41,272			778,365
Accumulated amortization	(404,134		)	—			—			(21,176		)	—	(11,839		)	—		(29,667		)	(466,816		)
	225,169			—			—			24,661				1,029			49,085		11,605			311,549
Mining properties, net	$	271,415		$	40,173		$	121,608		$	49,003			$	7,358		$	49,085	$	11,605		$	550,247

December 31, 2016	Palmarejo			Rochester			Kensington			Wharf			San Bartolomé			La Preciosa		Joaquin		Other			Total
Mine development	$	174,890		$	165,230		$	271,175		$	37,485		$	39,184		$	—	$	—	$	—		$	687,964
Accumulated amortization	(134,995		)	(138,244		)	(154,744		)	(11,699		)	(32,192		)	—				—			(471,874		)
	39,895			26,986			116,431			25,786			6,992			—		—		—			216,090
Mineral interests	629,303			—			—			45,837			12,868			49,085		10,000		37,272			784,365
Accumulated amortization	(381,686		)	—			—			(19,249		)	(11,695		)	—		—		(29,370		)	(442,000		)
	247,617			—			—			26,588			1,173			49,085		10,000		7,902			342,365
Mining properties, net	$	287,512		$	26,986		$	116,431		$	52,374		$	8,165		$	49,085	$	10,000	$	7,902		$	558,455