Property, Plant and Equipment, net (Tables)

3 Months Ended

Mar. 31, 2014

Property, Plant and Equipment, net

Schedule of components of property, plant and equipment

	March 31,			December 31,
	2014			2013
	(in thousands)
Mineral properties	$	22,397		$	22,397
Exploration properties	2,993			2,993
Royalty properties	200			200
Buildings	2,357			2,349
Mining equipment and machinery	19,441			19,441
Other furniture and equipment	871			1,054
Asset retirement cost	2,002			2,087
	50,261			50,521
Less: Accumulated depreciation and amortization	(18,816		)	(18,146		)
	31,445			32,375