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Long-term debt - Revolving Credit Facilities (Details)
 11 Months Ended 12 Months Ended
Jul. 07, 2017
USD ($)
Jun. 01, 2017
USD ($)
payment
Feb. 13, 2017
Nov. 30, 2017
USD ($)
Dec. 31, 2018
EUR (€)
payment
Dec. 31, 2018
USD ($)
payment
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
May 30, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]                      
Principal               $ 702,181,000 $ 479,535,000    
Interest expense, capitalized to mineral property interests           $ 0   20,052,000      
Repayments of lines of credit           200,000,000   0      
Repayment of credit facility           27,670,000   16,782,000      
Equipment loan facilities, drawdowns net of transaction costs (Note 10)           $ 32,117,000   68,224,000      
Debt service reserve account               12,918,000 13,736,000    
Revolving credit facility:                      
Disclosure of detailed information about borrowings [line items]                      
Line of credit facility, maximum borrowing capacity $ 500,000,000               500,000,000    
Accordion feature higher borrowing capacity $ 600,000,000                    
Borrowings maturity term 4 years                    
Principal               344,149,000 395,822,000    
Undrawn borrowing facilities                 100,000,000    
Fekola Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Line of credit facility, maximum borrowing capacity | €         € 71,400,000.0            
Borrowings maturity term     30 months   5 years 5 years          
Principal               50,569,000 57,242,000    
Undrawn borrowing facilities         € 2,000,000       1,900,000    
Equipment loan facility, drawdowns net of transaction costs (Note 10)         € 20,000,000 $ 24,000,000 € 49,000,000 54,000,000      
Mandatory reserve deposit payment coverage period         6 months 6 months          
Debt service reserve account         € 8,000,000       $ 9,000,000    
Number of quarterly installment payments | payment         20 20          
Commitment fee initial payment period         24 months 24 months          
Otjikoto Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Additional borrowing capacity                     $ 6,000,000
Unused capacity commitment fee         1.20%       1.20%    
Principal               20,750,000 $ 10,816,000    
Interest expense, capitalized to mineral property interests           $ 2,000,000          
Equipment loan facility, drawdowns net of transaction costs (Note 10)           $ 6,000,000          
Mandatory reserve deposit payment coverage period         6 months 6 months          
Debt service reserve account               5,000,000 4,000,000    
Number of quarterly installment payments | payment         20 20          
Masbate Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Line of credit facility, maximum borrowing capacity   $ 18,000,000                  
Unused capacity commitment fee   1.15%                  
Borrowings maturity term   5 years                  
Principal               7,719,000 13,071,000    
Undrawn borrowing facilities                 $ 1,000,000    
Equipment loan facility, drawdowns net of transaction costs (Note 10)           $ 8,000,000   9,000,000      
Number of quarterly installment payments | payment   20                  
Bottom of range | Revolving credit facility:                      
Disclosure of detailed information about borrowings [line items]                      
Unused capacity commitment fee 0.50%                    
Bottom of range | Fekola Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Principal | €         € 5,000,000            
Bottom of range | Masbate Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Principal   $ 500,000                  
Top of range | Revolving credit facility:                      
Disclosure of detailed information about borrowings [line items]                      
Unused capacity commitment fee 0.925%                    
Portion of convertible notes outstanding                   $ 100,000,000  
London Interbank Offered Rate LIBOR | Otjikoto Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis         3.85%       3.85%    
London Interbank Offered Rate LIBOR | Masbate Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis   3.85%                  
London Interbank Offered Rate LIBOR | Bottom of range | Revolving credit facility:                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis 2.25%                 2.50%  
London Interbank Offered Rate LIBOR | Top of range | Revolving credit facility:                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis 3.25%                 4.00%  
EURIBOR | Fekola Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis         5.10%       5.10%    
Fekola                      
Disclosure of detailed information about borrowings [line items]                      
Interest expense, capitalized to mineral property interests       $ 20,000,000              
Fekola | Revolving credit facility:                      
Disclosure of detailed information about borrowings [line items]                      
Interest expense, capitalized to mineral property interests               8,000,000      
Tranche 1 | Fekola Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Unused capacity commitment fee         1.15%       1.15%    
Tranche 2 | Fekola Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Additional commitment fee percentage         0.50%       0.50%    
Tranche 3 | Fekola Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Additional commitment fee percentage         0.4167%       0.4167%    
Principal | Revolving credit facility:                      
Disclosure of detailed information about borrowings [line items]                      
Principal               $ 350,000,000 $ 400,000,000    
Principal | Fekola Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Principal                 58,634,000    
Principal | Otjikoto Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Principal                 10,922,000    
Principal | Masbate Equipment Loan Facility                      
Disclosure of detailed information about borrowings [line items]                      
Principal                 $ 13,526,000