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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Other Intangible Assets [Abstract] |
Intangible assets | Intangible Assets
| Water rights 1 |  | Technology 2 |  | Supply contracts 3 |  | Exploration potential 4 |  | Total |
Opening balance January 1, 2018 |  | $71 |  |  | $9 |  |  | $11 |  |  | $164 |  |  | $255 |
Amortization and impairment losses 5 | — |  | (1 | ) | (3 | ) | (24 | ) | (28 | )
Closing balance December 31, 2018 |  | $71 |  |  | $8 |  |  | $8 |  |  | $140 |  |  | $227 |
Additions | 1 |  | — |  | — |  | — |  | 1 |
Amortization | — |  | (1 | ) | (1 | ) | — |  | (2 | )
Closing balance December 31, 2019 |  | $72 |  |  | $7 |  |  | $7 |  |  | $140 |  |  | $226 |
Cost |  | $72 |  |  | $17 |  |  | $39 |  |  | $298 |  |  | $426 |
Accumulated amortization and impairment losses | — |  | (10 | ) | (32 | ) | (158 | ) | (200 | )
Net carrying amount December 31, 2019 |  | $72 |  |  | $7 |  |  | $7 |  |  | $140 |  |  | $226 |
1 | Relates to water rights in South America, and will be amortized through cost of sales when we begin using these in the future.
2 | The amount is amortized through cost of sales using the UOP method over LOM ounces of the Pueblo Viejo mine, with no assumed residual value.
3 | Relates to a supply agreement with Michelin North America Inc. to secure a supply of tires and is amortized over the effective term of the contract through cost of sales.
4 | Exploration potential consists of the estimated fair value attributable to exploration licenses acquired as a result of a business combination or asset acquisition. The carrying value of the licenses will be transferred to PP&E when the development of attributable mineral resources commences.
5 |
Goodwill |
| Closing balance December 31, 2018 |  | Additions |  | Disposals |  | Closing balance December 31, 2019 |
Carlin |  | $— |  |  | $1,294 |  |  | $— |  |  | $1,294 |
Cortez | 514 |  | 210 |  | — |  | 724 |
Turquoise Ridge | 528 |  | 194 |  | — |  | 722 |
Phoenix | — |  | 119 |  | — |  | 119 |
Goldrush | — |  | 175 |  | — |  | 175 |
Hemlo | 63 |  | — |  | — |  | 63 |
Kalgoorlie | 71 |  | — |  | (71 | ) | — |
Loulo-Gounkoto | — |  | 1,672 |  | — |  | 1,672 |
Total |  | $1,176 |  |  | $3,664 |  |  | ($71 | ) |  | $4,769 |
On a total basis, the gross amount and accumulated impairment losses are as follows:
Cost |  | $12,211 |
Accumulated impairment losses December 31, 2019 | (7,442 | )
Net carrying amount December 31, 2019 |  | $4,769 |

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