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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
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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%

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