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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Summary of Mineral Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Mineral properties $ 92,625 $ 91,031
Uranerz ISR properties (a)    
Property, Plant and Equipment [Line Items]    
Mineral properties 35,060 36,096
In-situ recovery total    
Property, Plant and Equipment [Line Items]    
Mineral properties 35,060 36,096
Sheep Mountain    
Property, Plant and Equipment [Line Items]    
Mineral properties 34,183 34,183
Roca Honda    
Property, Plant and Equipment [Line Items]    
Mineral properties 22,095 19,465
Other    
Property, Plant and Equipment [Line Items]    
Mineral properties 1,287 1,287
Conventional total    
Property, Plant and Equipment [Line Items]    
Mineral properties $ 57,565 $ 54,935