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Debt instruments (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 14, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument Held [LineItems] |  |  |  |  |
Number of shares issued |  | 350,056,012 |  |  |
Equity |  | $ 2,799,857 | $ 2,968,200 | $ 3,029,565 | $ 3,063,627
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Debt Instrument Held [LineItems] |  |  |  |  |
Number of shares issued | 63,922,565 |  |  |  |
Subsidiary Sale Of Stock Value | $ 47,911 |  |  |  |
Escrow Deposits |  | 48,752 | 48,617 |  |
Fair Value of Subsidiary Sale of Stock | 41,695 |  |  |  |
Equity | $ 6,216 | 324,386 | 489,712 | 583,723 | $ 659,115
Subsidiary Sale of Stock Outstanding Amount |  | 45,423 | 43,927 |  |
Unwinding of discount of debt instruments |  | $ 1,497 | $ 1,497 | $ 1,497 |
Sumitomo [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Debt Instrument Held [LineItems] |  |  |  |  |
Proportion of ownership interest in subsidiary | 5.00% |  |  |  |
Newmont [Member] |  |  |  |  |
Debt Instrument Held [LineItems] |  |  |  |  |
Proportion of ownership interest in subsidiary | 51.35% |  |  |  |
Buenaventura |  |  |  |  |
Debt Instrument Held [LineItems] |  |  |  |  |
Proportion of ownership interest in subsidiary | 43.65% |  |  |  |

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