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Mine standby costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of other income & finance costs [Line Items]    
Mine standby costs $ 34,367 $ 15,351
Stratoni    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs 24,245 7,168
Skouries    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs 7,782 5,785
Other mine standby costs    
Disclosure of other income & finance costs [Line Items]    
Mine standby costs $ 2,340 $ 2,398