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Mining interests - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | $ 2,035,097 | $ 2,124,133 | $ 1,950,356
Investments in joint ventures (accounted for using the equity method) | 72,078 | 65,830 |
Total property, plant and equipment and joint ventures accounted for using the equity method | 2,107,175 | 2,189,963 | 2,004,080
Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 1,881,768 | 1,972,451 | 856,172
Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 152,649 | 150,971 | 123,962
Office, furniture and equipment, net |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 680 | 711 | 487
Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 3,113,126 | 2,909,819 | 2,546,361
Total property, plant and equipment and joint ventures accounted for using the equity method | 3,185,204 | 2,975,649 | 2,600,085
Cost | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 2,957,959 | 2,756,584 | 1,450,837
Cost | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 152,649 | 150,971 | 123,962
Cost | Office, furniture and equipment, net |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 2,518 | 2,264 | 1,827
Accumulated depreciation and depletion |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (1,078,029) | (785,686) | (596,005)
Accumulated depreciation and depletion | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (1,076,191) | (784,133) | (594,665)
Accumulated depreciation and depletion | Office, furniture and equipment, net |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (1,838) | (1,553) | (1,340)
Fekola Mine, Mali | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 1,024,156 | 1,059,307 | 0
Fekola Mine, Mali | Cost | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 1,168,491 | 1,094,784 | 0
Fekola Mine, Mali | Accumulated depreciation and depletion | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (144,335) | (35,477) | 0
Otjikoto Mine, Namibia | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 336,548 | 363,916 | 385,680
Otjikoto Mine, Namibia | Cost | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 575,127 | 527,069 | 481,378
Otjikoto Mine, Namibia | Accumulated depreciation and depletion | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (238,579) | (163,153) | (95,698)
Masbate Mine, Philippines | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 433,488 | 431,797 | 352,233
Masbate Mine, Philippines | Cost | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 681,509 | 625,722 | 517,457
Masbate Mine, Philippines | Accumulated depreciation and depletion | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (248,021) | (193,925) | (165,224)
Masbate Mine, Philippines | Cost, net of impairment | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 681,509 |  |
Libertad Mine, Nicaragua | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 19,854 | 71,813 | 74,328
Libertad Mine, Nicaragua | Cost | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 315,569 | 335,651 | 300,816
Libertad Mine, Nicaragua | Accumulated depreciation and depletion | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (295,715) | (263,838) | (226,488)
Libertad Mine, Nicaragua | Cost, net of impairment | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 315,569 |  |
Limon Mine, Nicaragua | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 67,722 | 45,618 | 43,931
Limon Mine, Nicaragua | Cost | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 217,263 | 173,358 | 151,186
Limon Mine, Nicaragua | Accumulated depreciation and depletion | Property, plant and equipment (depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (149,541) | (127,740) | (107,255)
Kiaka, Burkina Faso | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 73,173 | 69,989 | 64,907
Kiaka, Burkina Faso | Cost | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 73,173 | 69,989 | 64,907
Fekola Regional | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 21,903 | 17,211 | 9,326
Fekola Regional | Cost | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 21,903 | 17,211 | 9,326
Toega, Burkina Faso | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 19,581 | 10,603 | 4,819
Toega, Burkina Faso | Cost | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 19,581 | 10,603 | 4,819
Mocoa Royalty, Colombia | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 10,230 | 29,041 |
Mocoa Royalty, Colombia | Cost | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 10,230 | 29,041 |
Ondundu, Namibia | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 8,273 | 5,246 | 2,130
Ondundu, Namibia | Cost | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 8,273 | 5,246 | 2,130
Finland Properties, Finland | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 5,947 | 2,991 | 1,642
Finland Properties, Finland | Cost | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 5,947 | 2,991 | 1,642
Other | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 13,542 | 15,890 | 12,134
Other | Cost | Exploration and evaluation properties (non-depletable) |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 13,542 | 15,890 | 12,134
Gramalote, Colombia, net of impairment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Investments in joint ventures (accounted for using the equity method) | $ 72,078 | $ 65,830 | $ 53,724

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