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COMMITMENTS AND CONTINGENCIES - Short-term Bank Indebtedness (Details) - Line of Credit. - Secured Debt - Compania Minera Pangea, S.A. de C.V. (“CMP”)
$ in Millions
Nov. 30, 2017
MXN
Dec. 31, 2017
USD ($)
Nov. 30, 2017
USD ($)
Short-term Bank Indebtedness      
Maximum borrowing capacity MXN 120,000,000   $ 6.4
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Amount withdrawn from line of credit   $ 0.0  
El Gallo 1 mine | Maximum      
Short-term Bank Indebtedness      
Financing of value added tax (“VAT”) refunds (as a percent) 90.00%