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Mine standby costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other income & finance costs [Line Items]    
Mine standby costs $ 15,675 $ 17,334
Lamaque    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs 3,086 0
Skouries    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs 8,890 7,911
Vila Nova    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs 746 2,115
Other Mine Location    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs $ 2,953 $ 7,308