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ACQUISITIONS - Assets acquired and liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 25, 2017
Dec. 31, 2017
Dec. 31, 2018
Fair value of assets acquired and liabilities assumed:      
Inventory   $ 31,951 $ 22,039
Mineral Property Interests   293,437 309,145
Property, Plant and Equipment   51,046 114,734
Short term capital lease liability   (470) (1,511)
Asset retirement obligation   (646) (734)
Long term capital lease liability   (81) (4,918)
Deferred tax liability   (8,430) $ (6,426)
General and administrative expenses      
ACQUISITIONS      
Adjustments to purchase price   $ 1,300  
Black Fox      
ACQUISITIONS      
Adjustments to purchase price $ (7,500)    
Total fair value of assets acquired and liabilities assumed 27,500    
Fair value of assets acquired and liabilities assumed:      
Cash 249    
Accounts Receivable 470    
Prepaids 63    
Inventory 4,704    
Mineral Property Interests 8,954    
Property, Plant and Equipment 33,683    
Accounts Payable (5,247)    
Accrued Liabilities (3,213)    
Short term capital lease liability (557)    
Asset retirement obligation (11,233)    
Long term capital lease liability (172)    
Deferred tax liability (201)    
Total fair value of assets acquired and liabilities assumed $ 27,500