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DERIVATIVE INSTRUMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of detailed information about financial instruments [abstract] |
Disclosure of (gains) losses associated with derivative instruments [Table Text Block] |
|  | Years ended December 31, |
|  | 2020 |  |  | 2019 |
Realized (gain) loss on copper put options |  | (4,361 | ) |  | 2,834 |
Realized loss on fuel call options |  | 602 |  |  | — |
Unrealized loss on copper put options |  | 1,853 |  |  | — |
Unrealized gain on fuel call options |  | (31 | ) |  | — |
|  | (1,937 | ) |  | 2,834 |

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- Definition The disclosure of gains (losses) on derivative financial instruments. + References No definition available. + Details
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