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ASSET RETIREMENT OBLIGATIONS - Amortization of Mineral Property Interests and Asset Retirement Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mineral Property Interests    
Amortization of mineral property interests and asset retirement obligations $ 322 $ 322
El Gallo 1 mine    
Mineral Property Interests    
Amortization of mineral property interests and asset retirement obligations 300 300
Amortization of capitalized asset retirement costs $ 100 $ 100