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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Summary of Mineral Properties (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Mineral properties $ 92,380 $ 92,625
Uranerz ISR properties    
Property, Plant and Equipment [Line Items]    
Mineral properties 34,815 35,060
In-situ recovery total    
Property, Plant and Equipment [Line Items]    
Mineral properties 34,815 35,060
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 22,095
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 $ 57,565