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COMMITMENTS AND CONTINGENCIES - Short-term Bank Indebtedness (Details)
$ in Thousands
Nov. 30, 2017
MXN ($)
Dec. 31, 2018
USD ($)
Nov. 30, 2017
USD ($)
Short-term Bank Indebtedness      
Long-term debt   $ 24,603  
Term Loan      
Short-term Bank Indebtedness      
Long-term debt   50,000  
Line of Credit. | Secured Debt | Compania Minera Pangea, S.A. de C.V. (“CMP”)      
Short-term Bank Indebtedness      
Maximum borrowing capacity $ 120,000,000   $ 6,400
Market exchange rate 19.64   19.64
Line of Credit availability 1 year    
Period final payment of all principal and accrued interest due 24 months    
Amount withdrawn from line of credit   $ 0  
Line of Credit. | Secured Debt | El Gallo 1 mine | Compania Minera Pangea, S.A. de C.V. (“CMP”) | Maximum      
Short-term Bank Indebtedness      
Financing of value added tax (“VAT”) refunds (as a percent) 90.00%