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Debt instruments (Detail Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 14, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity |  | $ 3,029,565,000 | $ 3,063,627,000 | $ 3,047,213,000 | $ 3,389,236,000
Finance costs |  | 38,456,000 | 34,623,000 | $ 31,580,000 |
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Number of shares issued | 63,922,565 |  |  |  |
Name of subsidiary | MYSRL |  |  |  |
Equity | $ 6,216,000 | $ 583,723,000 | $ 659,115,000 |  | $ 2,228,825,000
Finance costs | 735,000 |  |  |  |
Subsidiary Sale Of Stock Value | 47,911,000 |  |  |  |
Escrow Deposits | 48,127,000 |  |  |  |
Fair Value of Subsidiary Sale of Stock | 41,695,000 |  |  |  |
Subsidiary Sale of Stock Outstanding Amount | $ 42,430,000 |  |  |  |
Sumitomo [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Proportion of ownership interest in subsidiary | 5.00% |  |  |  |
Newmont [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Proportion of ownership interest in subsidiary | 51.35% |  |  |  |
Buenaventura [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Proportion of ownership interest in subsidiary | 43.65% |  |  |  |

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