Asset Retirement Obligation and Reclamation Liabilities (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, plant and equipment, net		$ 9,842,000		$ 11,125,000
Summary of activity in the Velardena Operations ARO
Beginning balance		2,546,000
Accretion expense		97,000	$ 100,000
Ending balance		2,342,000
Velardena properties
ARO arising in the period	$ 3,500,000
Amortization expense related to the ARC		20,000
Summary of activity in the Velardena Operations ARO
Beginning balance		2,480,000	2,582,000
Changes in estimates, and other		(293,000)	(300,000)
Accretion expense		97,000	100,000
Ending balance		2,284,000	$ 2,382,000
ARO arising in the period (acquired at merger)	3,500,000
Velardena properties | Asset retirement cost
Property, plant and equipment, net	$ 1,900,000
El Quevar Project
Summary of activity in the Velardena Operations ARO
Beginning balance		100,000
Ending balance		$ 100,000