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

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