Mining Properties (Tables)

9 Months Ended

Sep. 30, 2017

Mining Properties [Abstract]

Mining Properties

Mining properties consist of the following (in thousands):

September 30, 2017	Palmarejo			Rochester			Kensington			Wharf				San Bartolomé			La Preciosa		Total
Mine development	$	191,562		$	192,734		$	294,388		$	38,339			$	39,445		$	—	$	756,468
Accumulated amortization	(142,262		)	(142,686		)	(170,343		)	(14,984		)		(33,418		)	—		(503,693		)
	49,300			50,048			124,045			23,355				6,027			—		252,775
Mineral interests	629,303			—			—			45,837				12,868			49,085		737,093
Accumulated amortization	(418,512		)	—			—			(23,264		)	—	(11,891		)	—		(453,667		)
	210,791			—			—			22,573				977			49,085		283,426
Mining properties, net	$	260,091		$	50,048		$	124,045		$	45,928			$	7,004		$	49,085	$	536,201

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