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PROPERTY, PLANT & EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [abstract] |
PROPERTY, PLANT & EQUIPMENT [Text Block] | 15. PROPERTY, PLANT & EQUIPMENT
Cost |  | Property acquisition costs |  |  | Mineral properties |  |  | Plant and equipment |  |  | Construction in progress |  |  | Total |
At January 1, 2019 |  | 99,872 |  |  | 385,504 |  |  | 719,211 |  |  | 188 |  |  | 1,204,775 |
Additions (Note 14) |  | 16,240 |  |  | 34,750 |  |  | 28,565 |  |  | 9,514 |  |  | 89,069 |
Changes in rehabilitation cost asset |  | — |  |  | (31,695 | ) |  | — |  |  | — |  |  | (31,695 | )
Disposals |  | — |  |  | — |  |  | (6,978 | ) |  | — |  |  | (6,978 | )
Foreign exchange translation |  | (4,468 | ) |  | (1,155 | ) |  | (2,205 | ) |  | — |  |  | (7,828 | )
Transfers between categories |  | — |  |  | — |  |  | 9,702 |  |  | (9,702 | ) |  | — |
At December 31, 2019 |  | 111,644 |  |  | 387,404 |  |  | 748,295 |  |  | — |  |  | 1,247,343 |
Additions (Note 14) |  | — |  |  | 44,454 |  |  | 22,351 |  |  | 12,660 |  |  | 79,465 |
Changes in rehabilitation cost asset |  | — |  |  | 12,906 |  |  | — |  |  | — |  |  | 12,906 |
Disposals |  | — |  |  | — |  |  | (7,023 | ) |  | — |  |  | (7,023 | )
Foreign exchange translation |  | (1,749 | ) |  | (693 | ) |  | (1,029 | ) |  |  |  |  | (3,471 | )
Transfers between categories |  | — |  |  | — |  |  | 7,334 |  |  | (7,334 | ) |  | — |
At December 31, 2020 |  | 109,895 |  |  | 444,071 |  |  | 769,928 |  |  | 5,326 |  |  | 1,329,220 |
Accumulated depreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At January 1, 2019 |  | — |  |  | 160,849 |  |  | 222,639 |  |  | — |  |  | 383,488 |
Depletion and amortization |  | — |  |  | 70,265 |  |  | 40,501 |  |  | — |  |  | 110,766 |
Disposals |  | — |  |  | — |  |  | (4,917 | ) |  | — |  |  | (4,917 | )
At December 31, 2019 |  | — |  |  | 231,114 |  |  | 258,223 |  |  | — |  |  | 489,337 |
Depletion and amortization |  | — |  |  | 59,540 |  |  | 43,929 |  |  | — |  |  | 103,469 |
Disposals |  | — |  |  | — |  |  | (6,205 | ) |  | — |  |  | (6,205 | )
At December 31, 2020 |  | — |  |  | 290,654 |  |  | 295,947 |  |  | — |  |  | 586,601 |
Net book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2019 |  | 111,644 |  |  | 156,290 |  |  | 490,072 |  |  | — |  |  | 758,006 |
At December 31, 2020 |  | 109,895 |  |  | 153,417 |  |  | 473,981 |  |  | 5,326 |  |  | 742,619 |
Net book value |  | Gibraltar Mines (75%) |  |  | Florence Copper |  |  | Yellowhead |  |  | Aley |  |  | Other |  |  | Total |
At December 31, 2019 |  | 539,747 |  |  | 188,512 |  |  | 16,240 |  |  | 12,766 |  |  | 741 |  |  | 758,006 |
Net additions |  | 55,355 |  |  | 18,091 |  |  | 2,409 |  |  | 1,095 |  |  | 1,697 |  |  | 78,647 |
Changes in rehabilitation cost asset (Note 20) |  | 12,906 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 12,906 |
Depletion and amortization |  | (103,013 | ) |  | (53 | ) |  | — |  |  | — |  |  | (403 | ) |  | (103,469 | )
Foreign exchange translation |  | — |  |  | (3,471 | ) |  | — |  |  | — |  |  | — |  |  | (3,471 | )
At December 31, 2020 |  | 504,995 |  |  | 203,079 |  |  | 18,649 |  |  | 13,861 |  |  | 2,035 |  |  | 742,619 |
During 2020, the Company capitalized stripping costs of $30,918 (2019: $25,705) and incurred other capital expenditures for Gibraltar of $23,057 (2019: $20,359). Non-cash additions to property, plant and equipment include $4,569 (2019: $2,847) of depreciation on mining assets related to capitalized stripping. The Company capitalized development costs of $18,059 (2019: $15,956) for the Florence Copper project. Since its acquisition of the Florence Copper project in November 2014, the Company has incurred and capitalized a total of $106 million in project development and other costs, including capitalized interest. Since January 1, 2020 development costs for Yellowhead of $2,409 have been capitalized as mineral property, plant and equipment. Depreciation related to the right of use assets for the year ended December 31, 2020 was $4,270 (2019: $4,217).

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