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Investments in associates and joint venture - Statements of financial position of Tinka under IFRS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Investments in associates [Line Items]        
Current assets $ 589,152 $ 648,619    
Non-current assets 3,390,465 3,458,655    
Current liabilities 360,436 565,357    
Shareholders' equity, net 2,799,857 $ 2,968,200 $ 3,029,565 $ 3,063,627
Tinka Resources Ltd [Member]        
Disclosure of Investments in associates [Line Items]        
Current assets 14,075      
Non-current assets 50,464      
Current liabilities (876)      
Shareholders' equity, net 63,663      
Adjustments to conform to the accounting policies of the Group 2,982      
Shareholders' equity, net, adjusted 66,645      
Group's interest $ 12,862