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Commitments and contingencies - Open tax procedures SUNAT (Details) - SUNAT.
 12 Months Ended
Jul. 30, 2021
PEN (S/)
Jul. 30, 2021
USD ($)
Apr. 01, 2021
Mar. 31, 2021
Jan. 05, 2021
PEN (S/)
installment
Dec. 31, 2022
PEN (S/)
Dec. 31, 2022
USD ($)
Jan. 05, 2021
USD ($)
Disclosure of Commitments and contingencies [Line Items]                
Number of equal monthly payments         66      
Tax assessment value         S/ 1,505,948,000     $ 405,588,000
Percentage over the letters of guarantee amount         5.00%      
Letters of guarantee outstanding, amount         S/ 1,580,126,000     $ 425,566,000
Monthly interest rate (in percent)     0.72% 0.80%        
Amount of tax liability interest paid           S/ 11,215,000 $ 3,020,000  
Year 2007 and 2008                
Disclosure of Commitments and contingencies [Line Items]                
Amount of tax liability paid S/ 1,583,128,000 $ 426,374,000            
Amount of tax liability interest paid 78,279,000 21,082,000            
Year 2009 [Member]                
Disclosure of Commitments and contingencies [Line Items]                
Amount of tax liability paid 193,398,000 52,199,000            
Amount of tax liability interest paid 8,477,000 2,283,000            
Year 2010 [Member]                
Disclosure of Commitments and contingencies [Line Items]                
Amount of tax liability paid 356,691,000 96,273,000            
Amount of tax liability interest paid S/ 16,762,000 $ 4,514,000            
Year 2016 [Member] | La Zanja [Member]                
Disclosure of Commitments and contingencies [Line Items]                
Amount of tax liability paid           S/ 4,288,000 $ 1,155,000