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Finance costs and finance income - Finance cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finance Cost and Finance Income [Line Items] |  |  |
Finance costs | $ 37,822 | $ 42,173 | $ 38,422
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Finance Cost and Finance Income [Line Items] |  |  |
Unwinding of the discount of the provision for mining closure, note 12(b) | 32,049 | 36,709 | 36,015
Commissions of guarantee letters | 3,153 | 2,485 | 2,113
Unwinding of debt instruments, note 14 | 1,497 | 1,497 | 735
Interests on tax contingency and others, see note 23 |  | 16,938 | 161
Finance costs | $ 36,699 | $ 57,629 | $ 39,024

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- Details
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