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Investments in associates and joint venture - Statements of profit or loss of Tinka under IFRS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Investments in associates [Line Items]      
Sales of goods $ 863,470 $ 637,619 $ 821,930
Net loss (262,804) (150,339) (28,459)
Share in results 240,450 62,702 $ 89,290
Tinka Resources Ltd [Member]      
Disclosure of Investments in associates [Line Items]      
Net loss (1,109) (2,311)  
Adjustments to conform to the accounting policies (4,583) (2,189)  
Net income, adjusted (5,692) (4,500)  
Share in results (1,098) (868)  
Total market capitalization of shares $ 11,000 $ 11,900  
Market capitalization value by each share $ 0.16 $ 0.18