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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, plant and equipment [abstract] |
Property, plant and equipment | Estimated useful lives of Major Asset Categories
Buildings, plant and equipment | 7 – 27 years
Underground mobile equipment | 5 - 7 years
Light vehicles and other mobile equipment | 2 - 3 years
Furniture, computer and office equipment | 2 - 3 years
| Buildings, plant and equipment |  | Mining property costs subject to depreciation 1,3 |  | Mining property costs not subject to depreciation 1,2 |  | Total |
At January 1, 2017 |  |  |  |
Net of accumulated depreciation |  | $4,556 |  |  | $7,194 |  |  | $2,353 |  |  | $14,103 |
Additions 4 | 158 |  | 219 |  | 1,966 |  | 2,343 |
Disposals | (72 | ) | (32 | ) | (1,093 | ) | (1,197 | )
Depreciation | (878 | ) | (819 | ) | — |  | (1,697 | )
Impairment reversals | (102 | ) | (359 | ) | 715 |  | 254 |
Transfers 5 | 551 |  | 449 |  | (1,000 | ) | — |
At December 31, 2017 |  | $4,213 |  |  | $6,652 |  |  | $2,941 |  |  | $13,806 |
At December 31, 2017 |  |  |  |
Cost |  | $14,209 |  |  | $21,068 |  |  | $14,507 |  |  | $49,784 |
Accumulated depreciation and impairments | (9,996 | ) | (14,416 | ) | (11,566 | ) | (35,978 | )
Net carrying amount – December 31, 2017 |  | $4,213 |  |  | $6,652 |  |  | $2,941 |  |  | $13,806 |
| Buildings, plant and equipment |  | Mining property costs subject to depreciation 1,3 |  | Mining property costs not subject to depreciation 1,2 |  | Total |
At January 1, 2016 |  |  |  |
Cost |  | $13,782 |  |  | $19,968 |  |  | $14,734 |  |  | $48,484 |
Accumulated depreciation and impairments | (9,098 | ) | (12,668 | ) | (12,284 | ) | (34,050 | )
Net carrying amount – January 1, 2016 |  | $4,684 |  |  | $7,300 |  |  | $2,450 |  |  | $14,434 |
Additions 4 | 71 |  | 272 |  | 933 |  | 1,276 |
Disposals | (80 | ) | — |  | (37 | ) | (117 | )
Depreciation | (794 | ) | (995 | ) | — |  | (1,789 | )
Impairment charges | 217 |  | 79 |  | 3 |  | 299 |
Transfers 5 | 458 |  | 538 |  | (996 | ) | — |
At December 31, 2016 |  | $4,556 |  |  | $7,194 |  |  | $2,353 |  |  | $14,103 |
At December 31, 2016 |  |  |  |
Cost |  | $14,111 |  |  | $20,778 |  |  | $14,634 |  |  | $49,523 |
Accumulated depreciation and impairments | (9,555 | ) | (13,584 | ) | (12,281 | ) | (35,420 | )
Net carrying amount – December 31, 2016 |  | $4,556 |  |  | $7,194 |  |  | $2,353 |  |  | $14,103 |
1 | Includes capitalized reserve acquisition costs, capitalized development costs and capitalized exploration and evaluation costs other than exploration license costs included in intangible assets.
2 | Assets not subject to depreciation includes construction-in-progress, projects and acquired mineral resources and exploration potential at operating mine sites and development projects.
3 | Assets subject to depreciation includes the following items for production stage properties: acquired mineral reserves and resources, capitalized mine development costs, capitalized stripping and capitalized exploration and evaluation costs.
4 | Additions include revisions to the capitalized cost of closure and rehabilitation activities.
5 | Primarily relates to long-lived assets that are transferred to PP&E once they are placed into service.
Mineral Property Costs Not Subject to Depreciation
| Carrying amount at Dec. 31, 2017 |  | Carrying amount at Dec. 31, 2016 |
Construction-in-progress 1 |  | $640 |  |  | $466 |
Acquired mineral resources and exploration potential | 24 |  | 24 |
Projects |  |
Pascua-Lama | 1,499 |  | 1,263 |
Norte Abierto | 612 |  | 444 |
Donlin Gold | 166 |  | 156 |
|  | $2,941 |  |  | $2,353 |
1 | Represents assets under construction at our operating mine sites.

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