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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
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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) |  |

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