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Goodwill (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Changes in goodwill [abstract] |
Summary of Key Assumptions Used for Assessing the Recoverable Amount of Goodwill |
| 2019 |  | 2018 |
Gold price ($/oz) | 1,400 |  | $1,275-1,300
Discount rate | 5 | % | 5 | %
Average factor to convert contained mineral resource ounces outside of reserves to ounces used in value beyond proven and probable calculations | 30 | % | 21 | %
Fair value per contained ounce of resources and exploration potential beyond proven and probable reserves | 200 |  | 140 |

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