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Basis for preparation, consolidation and accounting policies - Reclassifications of comparative information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Sales | $ 637,619 | $ 821,930 | $ 1,106,329
Cost applicable to sales | (393,888) | (512,874) | (613,381)
Trade and other payables | 179,956 | 166,244 |
Income tax payable | 3,162 | 5,650 |
Royalties expenses | 11,749 | 12,832 | 21,388
Accounts payable | 179,956 | 166,860 |
Current liabilities |  |  |
Trade and other payables | 179,956 | 166,244 |
Provisions | 68,000 | 72,771 |
Adjustments to reconcile profit after income tax to net cash flows from operating activities: |  |  |
Net cash and cash equivalents provided by operating activities | 122,885 | 47,065 | 346,260
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Sales | 592,394 | 734,526 | 658,653
Cost applicable to sales | (666,456) | (692,721) | (619,424)
Trade and other payables | 68,645 | 72,806 |
Income tax payable | 42,029 | 23,153 |
Royalties expenses |  | 49,000 | 3,600
Provision related to benefits to employees | 17,311 | 12,793 |
Current liabilities |  |  |
Trade and other payables | 68,645 | 72,806 |
Provisions | 101,786 | 45,317 |
Other accruals and liabilities |  | 49,301 |
Non-current liabilities |  |  |
Provisions | 1,660,603 | 1,587,551 |
Other accruals and liabilities | 40 | 305 |
Adjustments to reconcile profit after income tax to net cash flows from operating activities: |  |  |
Provisions |  | 10,051 | (2,617)
Trade and other payables |  | (8,231) | 2,028
Other accruals and liabilities |  | 21,282 | (197)
Value added tax credit and other taxes |  | (16,491) | 7,616
Current income tax expense |  | 64,928 | 29,297
Net cash and cash equivalents provided by operating activities |  | (34,419) | (78,519)
Minera Yanacocha SRL and subsidiary [Member] | Previously stated |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Trade and other payables |  | 76,484 |
Current liabilities |  |  |
Trade and other payables |  | 76,484 |
Provisions |  | 90,940 |
Non-current liabilities |  |  |
Provisions |  | 1,587,856 |
Adjustments to reconcile profit after income tax to net cash flows from operating activities: |  |  |
Provisions |  | 30,082 | (2,494)
Trade and other payables |  | (6,980) | 1,708
Value added tax credit and other taxes |  | (3,003) | 13,856
Income tax collected(paid) |  | 19,239 | 14,160
Income tax payable |  | 32,201 | 8,897
Net cash and cash equivalents provided by operating activities |  | (34,419) | (78,519)
Minera Yanacocha SRL and subsidiary [Member] | Reclassifications |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Trade and other payables |  | (3,678) |
Other capital contributions | 10,100 |  |
Current liabilities |  |  |
Trade and other payables |  | (3,678) |
Provisions |  | (45,623) |
Other accruals and liabilities |  | 49,301 |
Non-current liabilities |  |  |
Provisions |  | (305) |
Other accruals and liabilities |  | 305 |
Adjustments to reconcile profit after income tax to net cash flows from operating activities: |  |  |
Provisions |  | (20,031) | (123)
Trade and other payables |  | (1,251) | 320
Other accruals and liabilities |  | 21,282 | (197)
Value added tax credit and other taxes |  | (13,488) | (6,240)
Income tax collected(paid) |  | (19,239) | (14,160)
Income tax payable |  | (32,201) | (8,897)
Current income tax expense |  | 64,928 | 29,297
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Sales | 2,538,593 | 2,896,894 | 3,061,930
Income tax payable | 34,716 |  |
Royalties expenses | 2,000 | 2,923 | 2,743
Accounts payable - Related entities | 3,446 | 4,014 |
Other capital contributions | 11,500 | 10,100 | $ 8,900
Accounts payable | 411,857 | $ 479,104 |
Sociedad Minera Cerro Verde S.A.A. [Member] | Reclassifications |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Accounts payable - Related entities | (10,100) |  |
Amount of reclassifications from opening balance of accounts payable - related parties | 8,900 |  |
Amount of reclassifications from accounts payable - related parties during the period | 1,200 |  |
Provisions, short term | (27,900) |  |
Accounts payable | 27,900 |  |
Provision related to benefits to employees | (17,300) |  |
Other accounts payable | 17,300 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] | Reclassifications | Sales of goods |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Royalties expenses | (6,800) |  |
Sociedad Minera Cerro Verde S.A.A. [Member] | Reclassifications | Cost of sales |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Royalties expenses | $ 6,800 |  |

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