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Commitments and contingencies - Yanacocha - Tax Dispute related to the amortization of the contractual rights (Details)
 1 Months Ended 12 Months Ended
Jan. 18, 2019
Vote
Dec. 31, 2003
Dec. 31, 2002
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Disclosure of Commitments and contingencies [Line Items]              
Withholding tax rate   12.00% 30.00%        
Withholding tax, Old Tax Rate       12.00%      
Contingent liability           S/ 43,462,000 $ 11,993,000
Minera Yanacocha S.R.L              
Disclosure of Commitments and contingencies [Line Items]              
Withholding tax rate   12.00%          
Withholding tax, New Tax Rate       30.00%      
Payment to acquire contractual positions in mining concession agreements       $ 29,000,000      
Number of votes cast against | Vote 3            
Number of votes in favorable | Vote 2            
Minimum number of votes required for winning the case | Vote 4            
Contingent liability         $ 8,000,000    
Interest payable         16,800,000    
Penalty payable         4,000,000    
Potential liability in the form of fines and interest         61,000,000    
Amount related to workers participation       $ 2,100,000      
Minera Yanacocha SRL and subsidiary [Member]              
Disclosure of Commitments and contingencies [Line Items]              
Payment to acquire contractual positions in mining concession agreements         $ 29,000,000