Asset Retirement Obligations (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2012	Dec. 31, 2014
Summary of activity in the Velardena Operations ARO
Beginning balance	$ 2,685,000
Accretion expense	52,000	49,000
Ending balance	2,434,000
Velardena Properties
Asset Retirement and Reclamation Liabilities
Third party estimated closure plan			1,900,000
Estimated ARO and ARC recorded at the time of the acquisition	3,500,000
Amortization expense related to the ARC	100,000
Summary of activity in the Velardena Operations ARO
Beginning balance	2,582,000	2,467,000
Changes in estimates, and other	(300,000)	(85,000)
Accretion expense	52,000	49,000
Ending balance	2,334,000	2,431,000
El Quevar Project
Summary of activity in the Velardena Operations ARO
Beginning balance				100,000
Ending balance	$ 100,000			$ 100,000