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Mine standby costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other income & finance costs [Line Items]    
Mine standby costs $ 16,106 $ 34,367
Stratoni    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs 11,507 24,245
Skouries    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs 0 7,782
Other mine standby costs    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs $ 4,599 $ 2,340