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FINANCIAL RISK MANAGEMENT (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Financial Risk Management [Abstract] |
Disclosure of exposure to commodity price risk [Table Text Block] |
As at December 31,
2020 | 2019
Copper increase/decrease by US$0.37/lb. (2019: US$0.28/lb.)1 | 9,542 | 7,992
1 The analysis is based on the assumption that the year-end copper price increases/decreases 10 percent with all other variables held constant. At December 31, 2020, 20 million (2019: 22 million) pounds of copper in concentrate were exposed to copper price movements. The closing exchange rate at December 31, 2020 of CAD/USD 1.27 (2019: 1.30) was used in the analysis.
Disclosure of impact on earnings after tax and equity [Table Text Block] |
|  | Years ended December 31, |
|  | 2020 |  |  | 2019 |
Fair value sensitivity for fixed-rate instruments |  |  |  |  |  |
Senior secured notes |  | (1,696 | ) |  | (1,768 | )
Lease liabilities |  | (61 | ) |  | (149 | )
Lease related obligations |  | (83 | ) |  | (44 | )
Secured equipment loans |  | (142 | ) |  | (134 | )
|  | (1,982 | ) |  | (2,095 | )
Cash flow sensitivity for variable-rate instruments |  |  |  |  |  |
Cash and equivalents |  | 617 |  |  | 386 |
Disclosure of changes in assets and liabilities on basis of strengthening CAD against USD [Table Text Block] |
|  | Years ended December 31, |
|  | 2020 |  |  | 2019 |
Cash and equivalents |  | (6,213 | ) |  | (2,803 | )
Accounts receivable |  | (412 | ) |  | (824 | )
Accounts payable and accrued liabilities |  | 563 |  |  | 587 |
Senior secured notes |  | 23,321 |  |  | 23,790 |
Equipment loans |  | 414 |  |  | 527 |
Lease liabilities |  | 40 |  |  | 62 |
Disclosure of fair value measurement of assets [Table Text Block] |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Financial assets designated as FVPL |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset copper call options |  | — |  |  | 1,514 |  |  | — |  |  | 1,514 |
Derivative asset fuel call options |  | — |  |  | 278 |  |  | — |  |  | 278 |
|  | — |  |  | 1,792 |  |  | — |  |  | 1,792 |
Financial assets designated as FVOCI |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  | 1,791 |  |  | — |  |  | — |  |  | 1,791 |
Investment in subscription receipts |  | — |  |  | — |  |  | 1,200 |  |  | 1,200 |
Reclamation deposits |  | 2,825 |  |  | — |  |  | — |  |  | 2,825 |
|  | 4,616 |  |  | — |  |  | 1,200 |  |  | 5,816 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Financial assets designated as FVOCI |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities |  | 730 |  |  | — |  |  | — |  |  | 730 |
Investment in subscription receipts |  | — |  |  | — |  |  | 2,400 |  |  | 2,400 |
Reclamation deposits |  | 3,083 |  |  | — |  |  | — |  |  | 3,083 |
|  | 3,813 |  |  | — |  |  | 2,400 |  |  | 6,213 |
Disclosure of capital management [Table Text Block] |
|  | As at December 31, |
|  | 2020 |  |  | 2019 |
Cash |  | (85,110 | ) |  | (53,198 | )
Current portion of long-term debt |  | 17,617 |  |  | 16,460 |
Long-term debt |  | 345,787 |  |  | 357,025 |
Net debt |  | 278,294 |  |  | 320,287 |
Shareholders' equity |  | 317,372 |  |  | 301,686 |

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