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Commitments and contingencies - Additional information (Details)
 1 Months Ended 12 Months Ended
Jan. 05, 2021
PEN (S/)
installment
Jun. 23, 2004
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
PEN (S/)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2015
PEN (S/)
Dec. 31, 2015
USD ($)
Dec. 31, 2021
PEN (S/)
Dec. 31, 2021
USD ($)
Jan. 05, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 14, 2020
PEN (S/)
Dec. 14, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 20, 2019
PEN (S/)
Dec. 20, 2019
USD ($)
Sep. 30, 2019
PEN (S/)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
PEN (S/)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
PEN (S/)
Dec. 31, 2014
USD ($)
Dec. 31, 2012
PEN (S/)
Dec. 31, 2012
USD ($)
Disclosure of Commitments and contingencies [Line Items]                                                        
Contingent liability     S/ 43,462,000                   $ 11,993,000                              
Recoverability of litigation amount                               $ 190,500,000                        
Declared tax deductions not recognized                         1,100,000,000                              
Description of material leasing arrangements by lessor classified as operating lease     Legal procedures -Buenaventura - Legal procedures -Buenaventura -                                                
Tax expense (income), continuing operations       $ 25,430,000   $ (25,590,000) $ 26,879,000                                          
SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Tax assessment value S/ 1,505,948,000                     $ 415,549,000                                
Number of equal monthly payments | installment 66                                                      
Minera Yanacocha SRL and subsidiary [Member]                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Provision for collection of doubtful debts                               29,000,000                        
Loss contingencies, laws affected     The Peruvian Agency in charge of conducting environmental evaluations and audits is the OEFA, the Environmental Assessment and Enforcement Agency, this institution conducts periodic supervision of the Yanacocha mine. From 2011 to 2020, the OEFA issued notifications of alleged breaches of Yanacocha's environmental standards and environmental management instruments, related to past supervisions. OEFA has resolved identified findings that do not translate into environmental deterioration as a result of some bad practice in the Yanacocha operation. The experience with OEFA, in the case of finding administrative responsibility to Yanacocha, results in a corrective action, in addition to imposing a fine that is calculated by the avoided cost capitalized on the date of issuance of the directorial resolution, multiplied by potential factors of environmental impact. The presumed offenses identified by the OEFA currently range from zero to 33,676 The Peruvian Agency in charge of conducting environmental evaluations and audits is the OEFA, the Environmental Assessment and Enforcement Agency, this institution conducts periodic supervision of the Yanacocha mine. From 2011 to 2020, the OEFA issued notifications of alleged breaches of Yanacocha's environmental standards and environmental management instruments, related to past supervisions. OEFA has resolved identified findings that do not translate into environmental deterioration as a result of some bad practice in the Yanacocha operation. The experience with OEFA, in the case of finding administrative responsibility to Yanacocha, results in a corrective action, in addition to imposing a fine that is calculated by the avoided cost capitalized on the date of issuance of the directorial resolution, multiplied by potential factors of environmental impact. The presumed offenses identified by the OEFA currently range from zero to 33,676                                                
Tax expense (income), continuing operations       $ 53,018,000   64,928,000 $ 29,297,000                                          
Provision for tax Dispute related to the amortization of the contractual rights                               29,000,000                        
Maximum amount of potential excessive interest against which the company has filed an objection                         60,000,000                              
Maximum amount of duplicity of criteria against which the company has filed an objection                         81,000,000                              
Minera Yanacocha SRL and subsidiary [Member] | Los Tapados S.A [Member]                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Royalty rate on net sales     3.00% 3.00%                                                
Minera Yanacocha S.R.L                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Contingent liability                               8,000,000                        
Open tax procedure | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Collection of debt forced amount                                 S/ 120,262,000 $ 33,240,000                    
Appeal Proceedings Provision for collection of Doubtful Debt and Unfounded Income Case [Member]                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Provision for collection of doubtful debts                                         S/ 70,277,000 $ 19,378,000            
Provision for tax Dispute related to the amortization of the contractual rights                                         70,277,000 19,378,000            
Legal Proceedings [Member]                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Contingent liability                         5,400,000     3,000,000                        
Tax year 2009 and 2010 | Open tax procedure | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Declared tax deductions not recognized               S/ 76,023,000                               $ 20,978,000        
Compensation of tax losses               561,758,000 $ 155,010,000                                      
Tax year 2014 [Member] | Open tax procedure | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Declared tax deductions not recognized                                         S/ 94,898,000 $ 26,186,000            
Year 2007 [Member] | Open tax procedure | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Declared tax deductions not recognized                                                     S/ 1,056,310,000 $ 291,476,000
Year 2008 [Member] | Open tax procedure | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Declared tax deductions not recognized                                                 S/ 1,530,985,000 $ 422,457,000    
Year 2009 [Member] | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Collection of debt forced amount                   S/ 18,807,000 $ 5,190,000                                  
Income tax liabilities                           S/ 202,614,000 $ 55,909,000                          
Empresa de Generacin Huanza S.A                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Contingent liability     S/ 7,532,000   S/ 6,999,000               $ 2,080,000     $ 2,071,000                        
Empresa de Generacin Huanza S.A | Tax year 2014 [Member] | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Unrecognized Depreciation expense               S/ 27,532,000 $ 7,597,000                                      
Rio Seco                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Collection of debt forced amount                                     S/ 11,153,000 $ 3,279,000                
Rio Seco | Omission of Payment of General Sales Tax [Member] | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Contingent liability                                                     S/ 1,815,000 $ 501,000
San Jose Reservoir Trust [Member]                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Outstanding commitments made by entity, related party transactions                                             $ 6,321,000          
Other Subsidiaries [Member] | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Tax expense (income), continuing operations     9,485,000 $ 2,617,000                                                
Minera La Zanja S.R.L. [Member] | Tax year 2013 and 2015 | SUNAT                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Disallowance of development cost     S/ 3,185,000 $ 879,000 S/ 2,952,000 $ 815,000                                            
Sindicato Minero de Orcopampa S.A., note 29(b) [Member]                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Lease concession expense, Percent     10.00% 10.00%                                                
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] | Minera Yanacocha SRL and subsidiary [Member]                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Royalty rate on net sales     3.00% 3.00%                                                
Maximum | Cerro Verde [Member]                                                        
Disclosure of Commitments and contingencies [Line Items]                                                        
Royalty rate on net sales   3.00%