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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
3 Months Ended
Aug. 10, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
RELATED PARTY TRANSACTIONS        
Accounts payable   $ 27,292   $ 30,817
Long-term debt from related party (note 18)   24,640   $ 24,603
Term Loan        
RELATED PARTY TRANSACTIONS        
Face amount $ 50,000      
Debt Instrument Term 3 years      
Robert McEwen | Term Loan        
RELATED PARTY TRANSACTIONS        
Long-term debt from related party (note 18) $ 25,000      
Affiliate of Robert McEwen        
RELATED PARTY TRANSACTIONS        
Debt interest expense   600    
Affiliate of Robert McEwen | Term Loan        
RELATED PARTY TRANSACTIONS        
Long-term debt from related party (note 18) $ 25,000      
Entity Affiliated With Related Party | Lexam L.P.        
RELATED PARTY TRANSACTIONS        
Expense (income)   61 $ 27  
Outstanding accounts payable   65    
Entity Affiliated With Related Party | REVlaw        
RELATED PARTY TRANSACTIONS        
Expense (income)   41 52  
Outstanding accounts payable   $ 12 $ 32