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Mining interests - Narrative (Details)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Aug. 08, 2018
USD ($)
Jun. 15, 2018
USD ($)
shares
Jun. 14, 2018
May 22, 2018
USD ($)
Jun. 07, 2017
CAD ($)
Aug. 31, 2017
Nov. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Nov. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
$ / pound
$ / Ounce
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 30, 2009
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]                                
Impairment loss                       $ (55,353,000) $ 0      
Property, plant and equipment               $ 2,035,097,000       2,035,097,000 2,124,133,000 $ 1,950,356,000    
Capitalized to mining interests                       (74,961,000) (33,106,000)      
Interest expense, capitalized to mineral property interests                       0 20,052,000      
Acquisition of non-controlling interest (Note 8)                       2,500,000 1,500,000      
Gain on sale of Lynn Lake royalty (Note 8)                       0 6,593,000      
Write-down mineral property interests                       9,398,000 4,150,000      
Cost                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               3,113,126,000       3,113,126,000 2,909,819,000 2,546,361,000    
Reclass                       1,633,000 2,464,000      
Exploration and evaluation properties (non-depletable)                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               152,649,000       152,649,000 150,971,000 123,962,000    
Exploration and evaluation properties (non-depletable) | Cost                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               152,649,000       152,649,000 150,971,000 123,962,000    
Reclass                       (632,000) 0      
Property, plant and equipment (depletable)                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               1,881,768,000       1,881,768,000 1,972,451,000 856,172,000    
Property, plant and equipment (depletable) | Cost                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               2,957,959,000       2,957,959,000 2,756,584,000 1,450,837,000    
Reclass                       2,265,000 1,131,551,000      
Libertad                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Impairment loss               34,000,000 $ 16,000,000              
Libertad | Property, plant and equipment (depletable)                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               19,854,000       19,854,000 71,813,000 74,328,000    
Libertad | Property, plant and equipment (depletable) | Cost                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               315,569,000       315,569,000 335,651,000 300,816,000    
Reclass                       0 0      
Limon                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Impairment loss                             $ 23,000,000  
Tax effect of impairment in property, plant and equipment                 4,000,000           (7,000,000)  
Impairment loss, net of tax                             $ 16,000,000  
Reversal of impairment loss                 13,000,000              
Reversal of impairment loss, net of tax                 $ 9,000,000              
Acquisition of non-controlling interest (Note 8)       $ 2,500,000                        
Limon | Property, plant and equipment (depletable)                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               67,722,000       67,722,000 45,618,000 43,931,000    
Limon | Property, plant and equipment (depletable) | Cost                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               217,263,000       217,263,000 173,358,000 151,186,000    
Reclass                       0 0      
Mocoa                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Impairment loss                       18,000,000        
Mocoa | Exploration and evaluation properties (non-depletable)                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment                         29,041,000 29,004,000    
Mocoa | Exploration and evaluation properties (non-depletable) | Cost                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               11,000,000       11,000,000 29,041,000 29,004,000    
Reclass                         0      
Fekola                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Sales proceeds from pre-commercial production period             $ 101,000,000                  
Capitalized to mining interests             $ 28,000,000                  
Interest expense, capitalized to mineral property interests                     $ 20,000,000          
Fekola | Property, plant and equipment (depletable)                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               1,024,156,000       1,024,156,000 1,059,307,000 0    
Fekola | Property, plant and equipment (depletable) | Cost                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               1,168,491,000       1,168,491,000 1,094,784,000 0    
Reclass                       2,265,000 1,068,207,000      
Masbate | Property, plant and equipment (depletable)                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               433,488,000       433,488,000 431,797,000 352,233,000    
Masbate | Property, plant and equipment (depletable) | Cost                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Property, plant and equipment               $ 681,509,000       681,509,000 625,722,000 $ 517,457,000    
Reclass                       0 60,880,000      
Lynn Lake Royalty                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Consideration paid (received)         $ 9                      
Net smelter royalty         2.00%                      
Increase (decrease) in contingent consideration asset (liability)         $ 6         $ 0            
Contingent consideration period         24 months                      
Gain on sale of Lynn Lake royalty (Note 8)                   $ 7,000,000            
Namibia and Mali                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Write-down mineral property interests                       $ 9,000,000 $ 4,000,000      
Libero Copper Corp | Mocoa                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Number of shares received (in shares) | shares   10,400,000                            
Proceeds from sale of property, plant and equipment   $ 1,000,000                            
Net smelter royalty receivable   2.00%                            
Net smelter royalty recognized as of acquisition date   $ 10,000,000                            
Central Sun | Lynn Lake Royalty                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Net smelter royalty recognized as of acquisition date                               $ 0
Fekola SA                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Proportion of ownership interests held by non-controlling interests 20.00%         10.00%                    
Percentage of ownership interest in subsidiary 80.00%                         100.00%    
Consideration paid (received) $ (57,000,000)                              
Gain (loss) on sale of mineral properties 10,000,000                              
Receivables from sale of properties $ 47,000,000                              
Triton Minera S.A.                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Percentage of ownership interest in subsidiary       5.00%                        
Triton Minera S.A. | Limon                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Percentage of ownership interest in subsidiary       100.00%                        
Libero Copper Corp                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Proportion of ownership interest in associate   19.00% 0.00%                          
Interest rate risk | Libertad                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in risk variable, percent                       0.005%        
Reasonably possible change in risk variable impact on property, plant and equipment                       $ 0        
Interest rate risk | Limon                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in risk variable, percent                       0.005%        
Reasonably possible change in risk variable impact on property, plant and equipment                       $ 0        
Interest rate risk | Mocoa                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in risk variable, percent                       0.005%        
Reasonably possible change in risk variable impact on property, plant and equipment                       $ 1,000,000        
Commodity price risk | Libertad                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in risk variable impact on property, plant and equipment                       8,000,000        
Commodity price risk | Limon                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in risk variable impact on property, plant and equipment                       0        
Commodity price risk | Mocoa                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in risk variable impact on property, plant and equipment                       $ 1,000,000        
Long-term gold price | Commodity price risk | Libertad                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in price per unit (in usd per unit) | $ / Ounce                       50        
Long-term gold price | Commodity price risk | Limon                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in price per unit (in usd per unit) | $ / Ounce                       50        
Molybdenum Price | Commodity price risk | Mocoa                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in price per unit (in usd per unit) | $ / pound                       0.40        
Copper Price | Commodity price risk | Mocoa                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Reasonably possible change in price per unit (in usd per unit) | $ / pound                       0.15        
Non-participating Share Capital | Fekola SA                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Proportion of ownership interests held by non-controlling interests 10.00%                              
Priority dividend rate to non-controlling interest 10.00%                     10.00%        
Fully Participating Share Capital | Fekola SA                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Proportion of ownership interests held by non-controlling interests 10.00%                              
Central Bank Of West African States Prime Rate | Receivables From Sale Of Properties | Fekola SA                                
Disclosure of detailed information about property, plant and equipment [line items]                                
Borrowings, adjustment to interest rate basis 3.00%