Property, Plant and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment, Net

Schedule of components of property, plant and equipment

	March 31,			December 31,
	2015			2014
	(in thousands)
Mineral properties	$	22,198		$	22,397
Exploration properties	2,743			2,743
Royalty properties	200			200
Buildings	4,377			4,378
Mining equipment and machinery	17,460			17,694
Other furniture and equipment	841			841
Asset retirement cost	1,702			2,002
	49,521			50,255
Less: Accumulated depreciation and amortization	(22,199		)	(21,224		)
	27,322			29,031