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BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - Minera San Xavier S.A. de C.V. [Member] | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of subsidiaries |  |
Principal activity of subsidiary | Mining |
Method used to account for subsidiary | Consolidated |
Country of incorporation and operation | Mexico |
Proportion of ownership interest in subsidiary | 100.00% | 100.00%

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