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Net sales - Additional information (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] |  |  |
Percentage of entity's revenue | 10.00% |  |
Percentage Of Sale Expenses On Operating Income | 3.00% | 3.00% | 2.00%
Percentage Of Transportation Services On Sales Expenses | 64.00% | 58.00% | 58.00%
Percentage Of Shipping Expenses On Sales Expenses | 13.00% | 22.00% | 21.00%
Revenue from sale of goods, related party transactions | $ 2,400,000 | $ 2,700,000 | $ 2,900,000
Increase decrease in revenue from sale of copper through adjustments arising from change in provisional price | $ 64,700 | $ 56,800 | $ 88,800
Percentage of sales to related party | 94.00% | 92.00% | 94.00%
Customer1 [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Percentage of entity's revenue | 26.00% | 25.00% | 32.00%
Customer2 [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Percentage of entity's revenue | 23.00% | 16.00% | 13.00%
Customer3 [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Percentage of entity's revenue | 16.00% | 11.00% | 11.00%
Customer4 [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Percentage of entity's revenue | 15.00% |  |
Trade receivables [member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Percentage of entity's revenue | 65.00% | 84.00% |
Minera Yanacocha SRL and subsidiary [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Adjustments for decrease (increase) in trade and other receivables | $ 583 | $ 176 | $ 15
Minera Yanacocha SRL and subsidiary [Member] | Copper concentrate [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Percentage of copper sales | 0.00% |  |
Minera Yanacocha SRL and subsidiary [Member] | Ocean Partners | Copper concentrate [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Percentage of copper sales | 100.00% |  |
Minera Yanacocha SRL and subsidiary [Member] | Switzerland |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Percentage of copper sales | 100.00% |  |
Minera Yanacocha Srl And Subsidiaries [Member] |  |  |
Disclosure Of Net Sales [Line Items] |  |  |
Adjustments for decrease (increase) in trade and other receivables | $ (7,110) | $ 13,290 | $ (7,580)

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