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Investments in associates and joint venture - Statement of fair values of the identifiable assets and liabilities of Tinka (Details) $ in Thousands, £ in Millions |  | 12 Months Ended
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Jan. 31, 2020 GBP (£) | Jan. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |  |
Consideration transferred |  |  | $ 13,453 | $ 0 | $ 0
Tinka Resources Ltd [Member] |  |  |  |  |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |  |  |  |
Current assets |  |  | 16,548 |  |
Non-current assets |  |  | 53,769 |  |
Current liabilities |  |  | (612) |  |
Total identifiable net assets at fair value |  |  | 69,705 |  |
Consideration transferred | £ 16 | $ 13,400 | $ 13,453 |  |

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