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Basis for preparation, consolidation and accounting policies - Impact of Adoption of IFRS 16 on consolidated statement of financial position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 14, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Mining concessions, development costs, right-of-use asset, property, plant and equipment, net | $ 1,650,361 | $ 1,754,372 | $ 1,847,615 |  |
Right-of-use assets | 7,178 | 6,185 |  |  |
Deferred income tax asset | 73,850 | 74,556 |  |  |
Total assets | 3,979,617 | 4,107,274 | 4,217,221 |  |
Liabilities |  |  |  |  |
Financial obligations | 25,086 | 265,692 |  |  |
Total liabilities | 1,179,760 | 1,139,074 | 1,187,656 |  |
Retained earnings | 1,503,785 | 1,639,658 |  |  |
Total shareholders' equity, net | 2,799,857 | 2,968,200 | 3,029,565 |  | $ 3,063,627
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Assets |  |  |  |  |
Mining concessions, development costs, right-of-use asset, property, plant and equipment, net | 1,039,579 | 1,038,294 | 840,454 |  |
Deferred income tax asset | 1,071 | 1,071 |  |  |
Total assets | 2,313,438 | 2,312,072 |  |  |
Liabilities |  |  |  |  |
Total liabilities | 1,989,052 | 1,822,360 |  |  |
Retained earnings | (32,134) | 133,315 |  |  |
Total shareholders' equity, net | $ 324,386 | $ 489,712 | $ 583,723 | $ 6,216 | $ 659,115

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