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Segmented information - Operating segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of operating segments [line items] |  |
Gold revenue | $ 1,225,061 | $ 638,677
Intersegment gold revenue | 0 | 0
Production costs | 475,702 | 302,394
Depreciation & depletion | 306,714 | 160,682
Impairment (reversal) of long-lived assets | 55,353 |
Write-down mineral property interests | 9,398 | 4,150
Current income tax, withholding and other taxes | 109,200 | 27,500
Net income for the year | 45,121 | 61,566
Capital expenditures | 271,848 | 353,121
Total assets | 2,547,804 | 2,685,157
Operating segments | Fekola |  |
Disclosure of operating segments [line items] |  |
Gold revenue | 560,516 | 6,064
Intersegment gold revenue | 0 | 0
Production costs | 144,041 | 1,496
Depreciation & depletion | 116,491 | 1,122
Impairment (reversal) of long-lived assets | 0 |
Write-down mineral property interests | 0 | 0
Current income tax, withholding and other taxes | 83,832 | 8,014
Net income for the year | 147,637 | 14,824
Capital expenditures | 82,766 | 161,872
Total assets | 1,183,471 | 1,213,244
Operating segments | Otjikoto |  |
Disclosure of operating segments [line items] |  |
Gold revenue | 213,052 | 235,938
Intersegment gold revenue | 0 | 0
Production costs | 85,528 | 85,891
Depreciation & depletion | 76,325 | 66,081
Impairment (reversal) of long-lived assets | 0 |
Write-down mineral property interests | 1,758 | 2,700
Current income tax, withholding and other taxes | 1,566 | 2,358
Net income for the year | 6,387 | 46,944
Capital expenditures | 52,575 | 42,392
Total assets | 434,110 | 466,767
Operating segments | Masbate |  |
Disclosure of operating segments [line items] |  |
Gold revenue | 283,366 | 247,561
Intersegment gold revenue | 0 | 0
Production costs | 120,876 | 106,649
Depreciation & depletion | 55,382 | 37,059
Impairment (reversal) of long-lived assets | 0 |
Write-down mineral property interests | 0 | 0
Current income tax, withholding and other taxes | 18,540 | 10,824
Net income for the year | 62,203 | 70,205
Capital expenditures | 52,846 | 57,255
Total assets | 523,063 | 520,969
Operating segments | Libertad |  |
Disclosure of operating segments [line items] |  |
Gold revenue | 96,147 | 83,256
Intersegment gold revenue | 9,004 | 21,528
Production costs | 77,869 | 68,658
Depreciation & depletion | 32,977 | 38,062
Impairment (reversal) of long-lived assets | 50,601 |
Write-down mineral property interests | 0 | 0
Current income tax, withholding and other taxes | 4,337 | 5,027
Net income for the year | (71,161) | (17,420)
Capital expenditures | 20,941 | 30,557
Total assets | 59,834 | 108,109
Operating segments | Limon |  |
Disclosure of operating segments [line items] |  |
Gold revenue | 11,980 | 5,858
Intersegment gold revenue | 56,506 | 43,721
Production costs | 47,388 | 39,700
Depreciation & depletion | 25,254 | 18,145
Impairment (reversal) of long-lived assets | (13,434) |
Write-down mineral property interests | 0 | 0
Current income tax, withholding and other taxes | 921 | 1,243
Net income for the year | (13,382) | (17,160)
Capital expenditures | 28,255 | 22,410
Total assets | 85,443 | 72,420
Operating segments | Other Mineral Properties |  |
Disclosure of operating segments [line items] |  |
Gold revenue | 0 | 0
Intersegment gold revenue | 0 | 0
Production costs | 0 | 0
Depreciation & depletion | 0 | 0
Impairment (reversal) of long-lived assets | 18,186 |
Write-down mineral property interests | 7,640 | 1,450
Current income tax, withholding and other taxes | 0 | 0
Net income for the year | (25,730) | 790
Capital expenditures | 34,211 | 38,198
Total assets | 229,129 | 218,915
Operating segments | Corporate & Other |  |
Disclosure of operating segments [line items] |  |
Gold revenue | 60,000 | 60,000
Intersegment gold revenue | (65,510) | (65,249)
Production costs | 0 | 0
Depreciation & depletion | 285 | 213
Impairment (reversal) of long-lived assets | 0 |
Write-down mineral property interests | 0 | 0
Current income tax, withholding and other taxes | 4 | 34
Net income for the year | (60,833) | (36,617)
Capital expenditures | 254 | 437
Total assets | $ 32,754 | $ 84,733

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