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Supplementary cash flow information - Other exploration and development (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fekola    
Statement Of Cash Flows [Line Items]    
Other exploration and development $ (14,246) $ (8,441)
Otjikoto    
Statement Of Cash Flows [Line Items]    
Other exploration and development (1,744) (1,220)
Masbate    
Statement Of Cash Flows [Line Items]    
Other exploration and development (4,941) (4,668)
Libertad    
Statement Of Cash Flows [Line Items]    
Other exploration and development (4,798) (6,751)
Limon    
Statement Of Cash Flows [Line Items]    
Other exploration and development (6,247) (6,362)
Toega, Burkina Faso    
Statement Of Cash Flows [Line Items]    
Other exploration and development (8,688) (5,784)
Fekola Regional    
Statement Of Cash Flows [Line Items]    
Other exploration and development (6,291) (6,245)
Ondundu    
Statement Of Cash Flows [Line Items]    
Other exploration and development (3,027) (3,116)
Finland Properties, Finland    
Statement Of Cash Flows [Line Items]    
Other exploration and development (2,479) (1,341)
Kiaka    
Statement Of Cash Flows [Line Items]    
Other exploration and development (2,238) (4,512)
Other    
Statement Of Cash Flows [Line Items]    
Other exploration and development (5,439) (5,233)
Total    
Statement Of Cash Flows [Line Items]    
Other exploration and development $ (60,138) $ (53,673)