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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2017
Property, plant and equipment [abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT
| 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.
a) 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.
b) Changes in Gold and Copper Mineral Life of Mine Plan As part of our annual business cycle, we prepare updated estimates of proven and probable gold and copper mineral reserves and the portion of resources considered probable of economic extraction for each mineral property. This forms the basis for our LOM plans. We prospectively revise calculations of amortization expense for property, plant and equipment amortized using the UOP method, where the denominator is our LOM ounces. The effect of changes in our LOM on amortization expense for 2017 was a $91 million decrease (2016: $67 million decrease). c) Capital Commitments and Operating Leases In addition to entering into various operational commitments in the normal course of business, we had commitments of approximately $118 million at December 31, 2017 (2016: $103 million) for construction activities at our sites and projects. Operating leases are recognized as an operating cost in the consolidated statements of income on a straight-line basis over the lease term. At December 31, 2017, we have operating lease commitments totaling $68 million, of which $21 million is expected to be paid within a year, $46 million is expected to be paid within two to five years and the remaining amount to be paid beyond five years.

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