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Net sales - Other operating revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Net Sales [Line Items] |  |  |
Other operating income (expense) | $ 2,690 | $ 14,715 | $ (1,308)
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Other operating income (expense) | 27,768 | 4,776 | 21,965
Copper and silver in concentrate [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Other operating income (expense) | 27,765 | 4,098 | 20,442
Others [Member] | Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Other operating income (expense) | $ 3 | $ 678 | $ 1,523

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- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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