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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, plant and equipment [abstract] |
Property, plant and equipment | Estimated useful lives of Major Asset Categories
Buildings, plant and equipment | 1 – 34 years
Underground mobile equipment | 3 - 7 years
Light vehicles and other mobile equipment | 1 - 7 years
Furniture, computer and office equipment | 1 - 7 years
Property, Plant, and Equipment
| Buildings, plant and equipment 1 | Mining property costs subject to depreciation 2,4 | Mining property costs not subject to depreciation 2,3 | Total |
At January 1, 2020 |  |  |  |  |
Net of accumulated depreciation | $7,753 |  | $12,288 |  | $4,100 |  | $24,141 |  |
Additions 6 | 10 |  | 259 |  | 1,919 |  | 2,188 |  |
Capitalized interest | — |  | — |  | 24 |  | 24 |  |
Disposals | (24) |  | (1) |  | (12) |  | (37) |  |
Depreciation | (1,219) |  | (1,146) |  | — |  | (2,365) |  |
Impairment reversals | 260 |  | 412 |  | 5 |  | 677 |  |
Transfers 7 | 693 |  | 1,757 |  | (2,450) |  | — |  |
At December 31, 2020 | $7,473 |  | $13,569 |  | $3,586 |  | $24,628 |  |
At December 31, 2020 |  |  |  |  |
Cost | $18,361 |  | $29,901 |  | $15,531 |  | $63,793 |  |
Accumulated depreciation and impairments | (10,888) |  | (16,332) |  | (11,945) |  | (39,165) |  |
Net carrying amount – December 31, 2020 | $7,473 |  | $13,569 |  | $3,586 |  | $24,628 |  |
| Buildings, plant and equipment 1 | Mining property costs subject to depreciation 2,4 | Mining property costs not subject to depreciation 2,3 | Total |
At January 1, 2019 |  |  |  |  |
Cost | $14,750 |  | $21,624 |  | $14,610 |  | $50,984 |  |
Accumulated depreciation and impairments | (11,150) |  | (15,366) |  | (11,642) |  | (38,158) |  |
Net carrying amount – January 1, 2019 | $3,600 |  | $6,258 |  | $2,968 |  | $12,826 |  |
Additions 5,6 | 298 |  | 3,458 |  | 1,371 |  | 5,127 |  |
Capitalized interest | — |  | — |  | 14 |  | 14 |  |
Acquisitions 8 | 3,473 |  | 2,270 |  | 1,660 |  | 7,403 |  |
Divestiture 9 | (127) |  | (106) |  | (27) |  | (260) |  |
Disposals | (22) |  | — |  | — |  | (22) |  |
Depreciation | (1,107) |  | (907) |  | — |  | (2,014) |  |
Impairment reversals (charges) | 990 |  | 742 |  | (309) |  | 1,423 |  |
Transfers 7 | 648 |  | 573 |  | (1,221) |  | — |  |
Assets held for sale | — |  | — |  | (356) |  | (356) |  |
At December 31, 2019 | $7,753 |  | $12,288 |  | $4,100 |  | $24,141 |  |
At December 31, 2019 |  |  |  |  |
Cost | $18,544 |  | $27,268 |  | $16,050 |  | $61,862 |  |
Accumulated depreciation and impairments | (10,791) |  | (14,980) |  | (11,950) |  | (37,721) |  |
Net carrying amount – December 31, 2019 | $7,753 |  | $12,288 |  | $4,100 |  | $24,141 |  |
1 2019 additions include $85 million of transitional adjustments for the recognition of leased right-of-use assets upon the Company’s adoption of IFRS 16 on January 1, 2019. Additions include $4 million of right-of-use assets for lease arrangements entered into during the year ended December 31, 2020 (2019: $49 million). Depreciation includes depreciation for leased right-of-use assets of $21 million for the year ended December 31, 2020 (2019: $25 million). The net carrying amount of leased right-of-use assets was $50 million as at December 31, 2020 (2019: $75 million). 2 Includes capitalized reserve acquisition costs, capitalized development costs and capitalized exploration and evaluation costs other than exploration license costs included in intangible assets. 3 Assets not subject to depreciation include construction-in-progress, projects and acquired mineral resources and exploration potential at operating minesites and development projects. 4 Assets subject to depreciation include the following items for production stage properties: acquired mineral reserves and resources, capitalized mine development costs, capitalized stripping and capitalized exploration and evaluation costs. 5 Additions include $3,422 million of remeasurement gain related to the change in ownership of Turquoise Ridge acquired through the Nevada Joint Venture. Refer to note 4 for further details. 6 Additions include revisions to the capitalized cost of closure and rehabilitation activities. 7 Primarily relates to long-lived assets that are transferred between categories within PP&E once they are placed into service. 8 Acquisitions include assets acquired as part of the Merger and the establishment of Nevada Gold Mines. Refer to note 4 for further details. 9Relates to the sale of our 50% interest in Kalgoorlie. Refer to note 4 for further details.Mineral Property Costs Not Subject to Depreciation
| Carrying amount at Dec. 31, 2020 | Carrying amount at Dec. 31, 2019
Construction-in-progress 1 | $1,208 |  | $1,009 |
Acquired mineral resources and exploration potential | 786 |  | 1,504 |
Projects |  |
Pascua-Lama | 741 |  | 754 |
Norte Abierto | 653 |  | 649 |
Donlin Gold | 198 |  | 184 |
| $3,586 |  | $4,100 |
1 Represents assets under construction at our operating minesites.

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