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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2022
Property, plant and equipment [abstract] |
Property, Plant and Equipment | Property, Plant and Equipment
(CAD$ in millions) |  | Exploration and Evaluation |  | Mineral Properties |  | Land, Buildings, Plant and Equipment |  | Capitalized Production Stripping Costs |  | Construction In Progress |  | Total
At December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Cost |  | $ | 903 |  |  | $ | 20,758 |  |  | $ | 16,722 |  |  | $ | 6,598 |  |  | $ | 7,919 |  |  | $ | 52,900 |
Accumulated depreciation |  | — |  |  | (6,223) |  |  | (9,145) |  |  | (3,954) |  |  | — |  |  | (19,322) |
Net book value |  | $ | 903 |  |  | $ | 14,535 |  |  | $ | 7,577 |  |  | $ | 2,644 |  |  | $ | 7,919 |  |  | $ | 33,578 |
Year ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Opening net book value |  | $ | 903 |  |  | $ | 14,535 |  |  | $ | 7,577 |  |  | $ | 2,644 |  |  | $ | 7,919 |  |  | $ | 33,578 |
Additions |  | 45 |  |  | — |  |  | 181 |  |  | 740 |  |  | 3,877 |  |  | 4,843 |
Disposals |  | — |  |  | — |  |  | (6) |  |  | — |  |  | (18) |  |  | (24) |
Impairment reversal |  | — |  |  | 215 |  |  | — |  |  | — |  |  | — |  |  | 215 |
Depreciation and amortization |  | — |  |  | (373) |  |  | (802) |  |  | (694) |  |  | — |  |  | (1,869) |
Transfers between classifications |  | — |  |  | (50) |  |  | 2,162 |  |  | — |  |  | (2,112) |  |  | — |
Decommissioning and restoration provisions change in estimate |  | — |  |  | 250 |  |  | 39 |  |  | — |  |  | — |  |  | 289 |
Capitalized borrowing costs |  | — |  |  | 115 |  |  | — |  |  | — |  |  | 255 |  |  | 370 |
Changes in foreign exchange rates |  | (4) |  |  | (11) |  |  | (13) |  |  | (2) |  |  | 10 |  |  | (20) |
Closing net book value |  | $ | 944 |  |  | $ | 14,681 |  |  | $ | 9,138 |  |  | $ | 2,688 |  |  | $ | 9,931 |  |  | $ | 37,382 |
At December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Cost |  | $ | 944 |  |  | $ | 21,362 |  |  | $ | 18,716 |  |  | $ | 7,334 |  |  | $ | 9,931 |  |  | $ | 58,287 |
Accumulated depreciation |  | — |  |  | (6,681) |  |  | (9,578) |  |  | (4,646) |  |  | — |  |  | (20,905) |
Net book value |  | $ | 944 |  |  | $ | 14,681 |  |  | $ | 9,138 |  |  | $ | 2,688 |  |  | $ | 9,931 |  |  | $ | 37,382 |
Year ended December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Opening net book value |  | $ | 944 |  |  | $ | 14,681 |  |  | $ | 9,138 |  |  | $ | 2,688 |  |  | $ | 9,931 |  |  | $ | 37,382 |
Additions |  | 102 |  |  | — |  |  | 389 |  |  | 1,138 |  |  | 4,964 |  |  | 6,593 |
Disposals |  | — |  |  | — |  |  | (25) |  |  | — |  |  | (5) |  |  | (30) |
Asset impairment |  | (37) |  |  | (247) |  |  | (959) |  |  | — |  |  | — |  |  | (1,243) |
Depreciation and amortization |  | — |  |  | (325) |  |  | (906) |  |  | (630) |  |  | — |  |  | (1,861) |
Transfers between classifications |  | — |  |  | 104 |  |  | 1,420 |  |  | — |  |  | (1,524) |  |  | — |
Decommissioning and restoration provisions change in estimate |  | — |  |  | (743) |  |  | (145) |  |  | — |  |  | — |  |  | (888) |
Capitalized borrowing costs |  | — |  |  | 131 |  |  | — |  |  | — |  |  | 358 |  |  | 489 |
Transfers to assets held for sale |  | (142) |  |  | (546) |  |  | (735) |  |  | — |  |  | (129) |  |  | (1,552) |
Changes in foreign exchange rates |  | 28 |  |  | 235 |  |  | 172 |  |  | 52 |  |  | 718 |  |  | 1,205 |
Closing net book value |  | $ | 895 |  |  | $ | 13,290 |  |  | $ | 8,349 |  |  | $ | 3,248 |  |  | $ | 14,313 |  |  | $ | 40,095 |
At December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Cost |  | $ | 895 |  |  | $ | 20,364 |  |  | $ | 18,567 |  |  | $ | 8,596 |  |  | $ | 14,313 |  |  | $ | 62,735 |
Accumulated depreciation |  | — |  |  | (7,074) |  |  | (10,218) |  |  | (5,348) |  |  | — |  |  | (22,640) |
Net book value |  | $ | 895 |  |  | $ | 13,290 |  |  | $ | 8,349 |  |  | $ | 3,248 |  |  | $ | 14,313 |  |  | $ | 40,095 |
16. Property, Plant and Equipment (continued) a) Exploration and Evaluation Significant exploration and evaluation projects in property, plant and equipment include the Galore Creek and Zafranal projects. The San Nicolás and Mesaba projects were reclassified to assets held for sale in 2022 (Notes 5(b) and (c)). b) Borrowing Costs Borrowing costs are capitalized at a rate based on our weighted average cost of borrowing or at the rate on the project-specific debt, as applicable. Capitalized borrowing costs are classified with the asset they relate to within mineral properties, land, buildings, plant and equipment, or construction in progress. Our weighted average borrowing rate used for capitalization of borrowing costs in 2022 was 5.7% (2021 – 5.4%).

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