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Commitments and contingencies - Environmental contingencies (Details)
 12 Months Ended
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