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Net sales - Revenue from contracts with customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of gold | $ 229,590 | $ 254,194 | $ 411,877
Less: Royalty contributions (see Note 2(k)) | (11,749) | (12,832) | (21,388)
Revenue from sale of goods | 637,619 | 821,930 | 1,106,329
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of gold | 592,394 | 734,526 | 658,653
Less: Royalty contributions (see Note 2(k)) |  | (49,000) | (3,600)
Revenue from sale of goods | 592,394 | 734,526 | 658,653
Minera Yanacocha SRL and subsidiary [Member] | S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Less: Royalty contributions (see Note 2(k)) | (18,638) | (22,297) | (20,385)
Minera Yanacocha SRL and subsidiary [Member] | Switzerland |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of gold | 590,002 | $ 734,526 | 518,664
Minera Yanacocha SRL and subsidiary [Member] | America |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of gold | 1,135 |  | $ 139,989
Minera Yanacocha SRL and subsidiary [Member] | Singapore |  |  |
Disclosure of Sales of goods [Line Items] |  |  |
Revenue from sale of gold | $ 1,257 |  |

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