Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of components of property, plant and equipment

	December 31,
	2015			2014
	(in thousands)
Mineral properties	$	9,630		$	22,397
Exploration properties	2,518			2,743
Royalty properties	200			200
Buildings	4,377			4,377
Mining equipment and machinery	16,998			17,695
Other furniture and equipment	841			841
Asset retirement cost	1,285			2,002
	35,849			50,255
Less: Accumulated depreciation & amortization	(24,724		)	(21,224		)
	11,125			29,031

Schedule of details of components of the impairment of long lived assets

	Net Book Value					Net Book Value
	Prior to			Sept. 30, 2015		After
	Impairment at			Impairment		Impairment at
	Sept. 30, 2015			Charges		Sept. 30, 2015
	(in thousands)
Mineral and exploration properties	$	13,660		$	12,306	$	1,354
Exploration properties	458			458		—
Buildings, plant and equipment	3,236			—		3,236
Asset retirement cost	417			417		—
Other working capital, net	(872		)	—		(872		)
	$	16,899		$	13,181	$	3,718

Velardena properties | Mineral Properties Asset Group

Schedule of details of components of the impairment of long lived assets

			Impairment
	Gross Value		Charge		Gross Value
	Prior to		Minerals		After
	Impairment at		Properties		Impairment at
	Sept. 30, 2015		Asset Group		Sept. 30, 2015
	(in thousands)
Mineral properties	$	21,936	$	12,306	$	9,630
Exploration properties	3,001		458		2,543
Royalty properties	200		—		200
Buildings	4,377		—		4,377
Mining equipment and machinery	17,181		—		17,181
Other furniture and equipment	841		—		841
Asset retirement cost	1,702		417		1,285
	49,238		13,181		36,057