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REVENUE (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Revenue [Abstract] |
Disclosure of information about revenue [Table Text Block] |
|  | Years ended December 31, |
|  | 2020 |  |  | 2019 |
Copper contained in concentrate |  | 331,584 |  |  | 321,082 |
Molybdenum concentrate |  | 18,842 |  |  | 31,161 |
Silver (Note 19) |  | 3,502 |  |  | 3,674 |
Price adjustments on settlement receivables |  | 11,570 |  |  | (419 | )
Total gross revenue |  | 365,498 |  |  | 355,498 |
Less: Treatment and refining costs |  | (22,231 | ) |  | (26,335 | )
Revenue |  | 343,267 |  |  | 329,163 |

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