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Commitments and contingencies - Environmental contingencies (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) item
OEFA [Member] |
Disclosure of Commitments and contingencies [Line Items] |
Potential fine, Per unit | $ 1,210
Minimum | OEFA [Member] |
Disclosure of Commitments and contingencies [Line Items] |
Number of units under violation | 0
Potential fine | $ 0
Maximum | OEFA [Member] |
Disclosure of Commitments and contingencies [Line Items] |
Number of units under violation | 3,667
Potential fine | $ 4,450,000
Minera Yanacocha SRL and subsidiary [Member] |
Disclosure of Commitments and contingencies [Line Items] |
Potential fine, Per unit | 1,194
Minera Yanacocha SRL and subsidiary [Member] | Minimum |
Disclosure of Commitments and contingencies [Line Items] |
Potential fine | 0
Minera Yanacocha SRL and subsidiary [Member] | Maximum |
Disclosure of Commitments and contingencies [Line Items] |
Potential fine | $ 40,209,000
Minera Yanacocha SRL and subsidiary [Member] | Maximum | OEFA [Member] |
Disclosure of Commitments and contingencies [Line Items] |
Number of units under violation | item | 33,676

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