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Other income & finance costs (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 30, 2019
Jun. 30, 2019
Apr. 30, 2007
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other income & finance costs [Line Items]              
Other income           $ 11,885,000 $ 16,281,000
Consideration paid (received)     $ 57,500,000        
Capitalized interest           3,848,000 36,750,000
Skouries              
Disclosure of other income & finance costs [Line Items]              
Capitalized interest             36,750,000
Lamaque              
Disclosure of other income & finance costs [Line Items]              
Capitalized interest             $ 36,750,000
TURKEY              
Disclosure of other income & finance costs [Line Items]              
Other income   $ 8,075,000          
Proportion of net smelter return royalty interest   2.50%          
Carrying value of net smelter return royalty   $ 0          
Consideration paid (received)   8,075,000          
Portion of consideration paid (received) consisting of cash and cash equivalents   $ 3,075,000          
Portion of consideration settled through transfer of licence $ 5,000,000            
Senior notes | Skouries              
Disclosure of other income & finance costs [Line Items]              
Capitalized interest           $ 0  
Senior notes | Lamaque              
Disclosure of other income & finance costs [Line Items]              
Capitalized interest       $ 3,848,000 $ 0