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Financial - risk management objectives and policies - Changes in copper price (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Financial risk management [Line Items] |  |  |
10% increase in future copper prices | $ 9,282 | $ 4,053 | $ 1,695
10% decrease in future copper prices | 9,282 | 3,545 | 1,681
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure Of Financial risk management [Line Items] |  |  |
10% increase in future copper prices | 112,080 | 99,219 | 72,847
10% decrease in future copper prices | $ (112,080) | $ (99,219) | $ (72,847)

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