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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Investments in associates [Line Items]      
Sales of goods $ 637,619 $ 821,930 $ 1,106,329
Net loss from continued operations (150,339) (28,459) (11,654)
Share in results (9,517) $ 47,710 $ (1,144)
Total market capitalization of shares $ 11,900    
Market capitalization value by each share $ 0.18    
Tinka Resources Ltd [Member]      
Disclosure of Investments in associates [Line Items]      
Net loss from continued operations $ (2,311)    
Adjustments to conform to the accounting policies (2,189)    
Net income, adjusted (4,500)    
Share in results $ (868)