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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE - Argentinian Tax Reform (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
INVESTMENT IN MINERA SANTA CRUZ S.A. (“MSC”) - SAN JOSE MINE    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 21.00%