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Other (expense) income and finance costs - Additional information (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, 2020
Dec. 31, 2019
Disclosure of other income & finance costs [Line Items]              
Income from royalty sale   $ 8,075,000       $ 0 $ 8,075,000
Consideration paid (received)   $ (8,075,000) $ 57,500,000        
Capitalized interest           $ 0 $ 3,848,000
Turkey              
Disclosure of other income & finance costs [Line Items]              
Proportion of net smelter return royalty interest   2.50%          
Carrying value of net smelter return royalty   $ 0          
Portion of consideration paid (received) consisting of cash and cash equivalents   $ 3,075,000          
Portion of consideration settled through transfer of license $ 5,000,000            
Senior notes | Lamaque              
Disclosure of other income & finance costs [Line Items]              
Capitalized interest       $ 3,848,000 $ 0