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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 |  |  |

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