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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