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Segmented information - Mining Interest by Country (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of operating segments [line items] |  |  |
Mining interests | $ 2,107,175 | $ 2,189,963 | $ 2,004,080
Mali |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | 1,051,327 | 1,081,364 |
Philippines |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | 433,488 | 431,797 |
Namibia |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | 345,417 | 369,763 |
Burkina Faso |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | 98,867 | 85,676 |
Nicaragua |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | 87,576 | 121,671 |
Colombia |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | 82,308 | 94,871 |
Finland |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | 5,947 | 2,991 |
Canada |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | 680 | 711 |
Total |  |  |
Disclosure of operating segments [line items] |  |  |
Mining interests | $ 1,565 | $ 1,119 |

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