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Tax situation - Additional information (Details)
 1 Months Ended 12 Months Ended
Jan. 05, 2021
installment
Jan. 01, 2017
Jan. 01, 2004
Jul. 17, 2012
Sep. 28, 2011
Dec. 31, 2020
PEN (S/)
installment
Dec. 31, 2020
USD ($)
installment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2020
USD ($)
Dec. 31, 2019
PEN (S/)
Dec. 31, 2019
USD ($)
Disclosure Of Income Tax Explanatory                                
Refunds provision                           $ 13,700,000    
Applicable tax rate   29.50%       32.00% 32.00% 32.00% 32.00%              
Income Tax Rate Applicable To Dividends           5.00% 5.00%                  
Applicable Tax Rate With Respect To Results Obtained                     6.80% 6.80% 4.10%      
Unused tax losses for which no deferred tax asset recognised           S/ 2,469,226,000               681,354,000 S/ 1,950,896,000 $ 588,151,000
Mining royalties.             $ 11,749,000 $ 12,832,000 $ 21,388,000              
Term of agreement of guarantees and measures to promote investments       15 years                        
Current tax expense (income)             9,924,000 11,911,000 16,882,000              
Current tax expense income relating to special mining tax               18,600,000                
Current tax expense income relating to mining royalties             17,300,000 28,400,000                
Current tax expense income relating to statutory retirement fund             2,600,000 1,800,000                
Deferred tax expense (income)             15,506,000 (37,501,000) 9,997,000              
Tax expense (income), continuing operations             $ 25,430,000 $ (25,590,000) $ 26,879,000              
Construction work in progress (as a percent)           80.00% 80.00%                  
Deductible temporary differences for which no deferred tax asset is recognised                           1,100,000,000    
Data processing equipment                                
Disclosure Of Income Tax Explanatory                                
Depreciation rate           50.00% 50.00%                  
Machinery and equipment                                
Disclosure Of Income Tax Explanatory                                
Depreciation rate           20.00% 20.00%                  
Land transport vehicle                                
Disclosure Of Income Tax Explanatory                                
Depreciation rate           33.30% 33.30%                  
Hybrid or electric land transport vehicle                                
Disclosure Of Income Tax Explanatory                                
Depreciation rate           50.00% 50.00%                  
SUNAT                                
Disclosure Of Income Tax Explanatory                                
Number Of Equal Monthly Payments | installment 66                              
Changes in tax rates or tax laws enacted or announced [member]                                
Disclosure Of Income Tax Explanatory                                
Applicable Tax Rate With Respect To Results Obtained                 5.00%              
Minera Yanacocha SRL and subsidiary [Member]                                
Disclosure Of Income Tax Explanatory                                
Applicable tax rate   29.50%       29.50% 29.50% 29.50% 29.50%              
Maximum mining tax rate on operating profit         12.00%                      
Mining royalties included in cost of production             $ 6,167,000 $ 7,360,000 $ 1,273,000              
Mining tax expense             $ 5,065,000 9,702,000 592,000              
Employers contribution rate           0.50% 0.50%                  
Employees Contribution Rate           0.50% 0.50%                  
Current Income Tax Payable                           39,604,000    
Mining Tax Payable                           2,425,000   2,877,000
Income and mining tax expense             $ 868,000 728,000 39,000              
Term of agreement of guarantees and measures to promote investments           15 years 15 years                  
Mining royalties payable                 0 $ 0       55,000   1,563,000
Current tax expense (income)             $ 53,018,000 64,928,000 30,368,000              
Deferred tax expense (income)             0 0 (1,071,000)              
Tax expense (income), continuing operations             $ 53,018,000 $ 64,928,000 $ 29,297,000              
Tax rate effect from change in tax rate           29.00% 29.00%                  
Sociedad Minera Cerro Verde S.A.A. [Member]                                
Disclosure Of Income Tax Explanatory                                
Applicable tax rate           32.00% 32.00% 32.00% 32.00%              
Deferred tax expense (income) recognised in profit or loss             $ 26,300,000 $ 141,600,000 $ 62,200,000              
Amount Paid For Disputed Tax Assessments                           432,700,000   432,700,000
Other non-current receivables [1]                           190,501,000   186,626,000
Current tax expense (income)             236,926,000 (298,074,000) 325,170,000              
Current tax expense income relating to special mining tax                 (28,200,000)              
Current tax expense income relating to mining royalties                 34,900,000              
Current tax expense income relating to statutory retirement fund                 1,500,000              
Deferred tax expense (income)             25,962,000 139,934,000 61,483,000              
Tax expense (income), continuing operations             236,926,000 298,074,000 325,170,000              
Current income tax expense             $ 210,600,000 $ 156,500,000 263,000,000              
Sociedad Minera Cerro Verde S.A.A. [Member] | December 2006 to December 2013 | SUNAT                                
Disclosure Of Income Tax Explanatory                                
Tax payment based on exchange rates                           435,200,000    
Tax payment based on estimated due           S/ 1,600,000               476,700,000    
Number Of Equal Monthly Payments | installment           66 66                  
Deferred Interest, Interest And Penalties             $ 496,500,000                  
Amount of the assessment, including interest and penalties           S/ 2,800,000,000 $ 771,200,000                  
Minera Yanacocha SRL One [Member]                                
Disclosure Of Income Tax Explanatory                                
Additional income and mining tax expense                 $ 8,230,000 $ 3,526,000            
Current Income Tax Payable                               20,276,000
Peruvian government [member]                                
Disclosure Of Income Tax Explanatory                                
Applicable tax rate           32.00% 32.00%                  
Peruvian government [member] | Minera Yanacocha SRL and subsidiary [Member]                                
Disclosure Of Income Tax Explanatory                                
Royalty rate on revenue         1.00%                      
IFRS Standby Letters of Credit [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]                                
Disclosure Of Income Tax Explanatory                                
Notional amount           S/ 1,370,300,000               $ 378,100,000 S/ 1,643,900,000 $ 495,600,000
Minimum                                
Disclosure Of Income Tax Explanatory                                
Royalty rate on revenue     1.00%                          
Minimum | Minera Yanacocha SRL and subsidiary [Member]                                
Disclosure Of Income Tax Explanatory                                
Mining tax rate on operating profit           2.00% 2.00%                  
Minimum | Minera Yanacocha SRL and subsidiary [Member] | Special Mining Burden [Member]                                
Disclosure Of Income Tax Explanatory                                
Mining tax rate on operating profit           4.00% 4.00%                  
Maximum                                
Disclosure Of Income Tax Explanatory                                
Royalty rate on revenue     12.00%                          
Maximum | Minera Yanacocha SRL and subsidiary [Member]                                
Disclosure Of Income Tax Explanatory                                
Mining tax rate on operating profit           8.40% 8.40%                  
Maximum | Minera Yanacocha SRL and subsidiary [Member] | Special Mining Burden [Member]                                
Disclosure Of Income Tax Explanatory                                
Mining tax rate on operating profit           13.12% 13.12%                  
[1] Represents disbursements made under protest by the Company in connection with disputed tax assessments related to reviews by SUNAT (Superintendencia Nacional de Administración Tributaria) from the years 2003 to 2012 (see Note 13(c) and 13(e)). According to current tax procedures and the timeframe for resolving these types of claims, management and its legal advisors expect resolution of this matter will be favorable to the Company and amounts will be recoverable.