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Tax situation - Additional information (Details)
 1 Months Ended 12 Months Ended
Dec. 26, 2019
PEN (S/)
Dec. 26, 2019
USD ($)
Oct. 26, 2019
USD ($)
Jan. 01, 2019
May 28, 2018
installment
item
Jan. 18, 2018
installment
Jan. 01, 2017
Dec. 31, 2014
Jan. 01, 2004
Oct. 31, 2018
PEN (S/)
installment
item
Oct. 31, 2018
USD ($)
installment
item
Jul. 17, 2012
Sep. 28, 2011
Dec. 31, 2019
PEN (S/)
installment
Dec. 31, 2019
USD ($)
installment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2019
USD ($)
Dec. 26, 2019
USD ($)
Oct. 29, 2019
PEN (S/)
Oct. 29, 2019
USD ($)
Dec. 31, 2018
PEN (S/)
Dec. 31, 2018
USD ($)
Disclosure Of Income Tax Explanatory                                                    
Refunds provision                                         $ 128,100,000          
Applicable tax rate                           29.50% 29.50% 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/ 1,950,896,000             588,151,000       S/ 1,550,156,000 $ 458,762,000
Mining royalties.                             $ 12,832,000 $ 21,388,000 $ 30,884,000                  
Term of agreement of guarantees and measures to promote investments                       15 years                            
Current tax expense (income)                             11,911,000 16,882,000 23,713,000                  
Current tax expense income relating to special mining tax                             18,600,000 (28,200,000) 102,600,000                  
Current tax expense income relating to mining royalties                             28,400,000 34,900,000 110,700,000                  
Current tax expense income relating to statutory retirement fund                             1,800,000 1,500,000 10,900,000                  
Deferred tax expense (income)                             (37,501,000) 9,997,000 (5,825,000)                  
Tax expense (income), continuing operations                             $ 25,590,000 $ (26,879,000) $ (17,888,000)                  
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       29.00%     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                             $ 7,360,000 $ 1,273,000 $ 3,140,000                  
Mining tax expense                             $ 9,702,000 592,000 1,418,000                  
Employers contribution rate                           0.50% 0.50%                      
Employees Contribution Rate                           0.50% 0.50%                      
Current Income Tax Payable                                         20,276,000          
Mining Tax Payable                                         2,877,000         3,552,000
Income and mining tax expense                             $ 728,000 39,000 29,000                  
Term of agreement of guarantees and measures to promote investments                           15 years 15 years                      
Mining royalties payable                                 0       1,563,000         0
Current tax expense (income)                             $ 64,928,000 30,368,000 7,026,000                  
Deferred tax expense (income)                             0 (1,071,000) 0                  
Tax expense (income), continuing operations                             $ 64,928,000 $ 29,297,000 $ 7,026,000                  
Tax rate effect from change in tax rate                           29.00% 29.00%                      
Minera Yanacocha SRL and subsidiary [Member] | Tax Year 2016 [Member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Progressive income tax rate               28.00%                                    
Minera Yanacocha SRL and subsidiary [Member] | Tax Year 2017 [Member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Progressive income tax rate               27.00%                                    
Minera Yanacocha SRL and subsidiary [Member] | Tax Year 2018 [Member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Progressive income tax rate               27.00%                                    
Minera Yanacocha SRL and subsidiary [Member] | Tax Year 2019 [Member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Progressive income tax rate               26.00%                                    
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                             $ 141,600,000 $ 62,200,000 $ (169,100,000)                  
Amount Paid For Disputed Tax Assessments                                         396,500,000          
Other non-current receivables [1]                                         186,626,000         183,208,000
Current tax expense (income)                             (298,074,000) (325,170,000)                    
Deferred tax expense (income)                             139,934,000 61,483,000 (167,541,000)                  
Tax expense (income), continuing operations                             298,074,000 325,170,000 486,043,000                  
Current income tax expense                             156,500,000 263,000,000 655,100,000                  
Sociedad Minera Cerro Verde S.A.A. [Member] | December 2006 to December 2008 [Member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Tax payment based on exchange rates                                               $ 214,400,000    
Tax payment based on estimated due                                             S/ 711,100,000 $ 221,900,000    
Sociedad Minera Cerro Verde S.A.A. [Member] | January 2009 To September 2011 [Member] | SUNAT                                                    
Disclosure Of Income Tax Explanatory                                                    
Tax payment based on exchange rates                                         95,000,000          
Tax payment based on estimated due                           S/ 315,100,000             94,700,000          
Number Of Installment Payment Programs | item                   2 2                              
Number Of Equal Monthly Payments | installment                   66 66                              
Deferred Interest, Interest And Penalties                     $ 202,800,000       202,800,000                      
Amount of the assessment, including interest and penalties                   S/ 1,000,000,000 $ 314,100,000     1,000,000,000 314,100,000                      
Sociedad Minera Cerro Verde S.A.A. [Member] | Fourth Quarter Of 2011 [Member] | SUNAT                                                    
Disclosure Of Income Tax Explanatory                                                    
Tax payment based on exchange rates                                           $ 17,400,000        
Tax payment based on estimated due S/ 57,600,000                                         $ 17,300,000        
Penalties and interest for default tax     $ 17,400,000                                              
Amount of the assessment, including interest and penalties S/ 57,600,000 $ 17,300,000                                                
Sociedad Minera Cerro Verde S.A.A. [Member] | Fourth Quarter Of 2011 To The Fourth Quarter Of 2012 [Member] | SUNAT                                                    
Disclosure Of Income Tax Explanatory                                                    
Number Of Equal Monthly Payments | installment           66                                        
Deferred Interest, Interest And Penalties                             40,500,000                      
Amount of the assessment, including interest and penalties                           255,800,000 77,100,000                      
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2012 [Member] | SUNAT                                                    
Disclosure Of Income Tax Explanatory                                                    
Tax payment based on exchange rates                                         19,800,000          
Tax payment based on estimated due                           65,700,000             19,500,000          
Deferred Interest, Interest And Penalties                             45,700,000                      
Amount of the assessment, including interest and penalties                           266,100,000 $ 80,200,000                      
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2013 [Member] | SUNAT                                                    
Disclosure Of Income Tax Explanatory                                                    
Penalties And Interest Of Special Mining Tax                           S/ 151,000,000             45,500,000          
Number Of Installment Payment Programs | item         2                                          
Number Of Equal Monthly Payments | installment         66                 66 66                      
Amount Of Assessment Including Interest And Penalties Special Mining Tax                           S/ 151,000,000             45,500,000          
Interest And Penalties Based On Exchange Rates                                         29,500,000          
Amount of the assessment, including interest and penalties                           S/ 183,900,000 $ 55,400,000                      
Exchange rate including interest and penalties                             22,100,000                      
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                                                   19,239,000
Current Income Tax Offset                             $ 7,913,000                      
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%                          
Standby Letters of Credit [Member] | Sociedad Minera Cerro Verde S.A.A. [Member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Notional amount                           S/ 1,643,900,000             $ 495,600,000       S/ 1,137,400,000 $ 336,600,000
Bottom of range [member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Royalty rate on revenue                 1.00%                                  
Bottom of range [member] | Minera Yanacocha SRL and subsidiary [Member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Mining tax rate on operating profit                           2.00% 2.00%                      
Bottom of range [member] | 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%                      
Top of range [member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Royalty rate on revenue                 12.00%                                  
Top of range [member] | Minera Yanacocha SRL and subsidiary [Member]                                                    
Disclosure Of Income Tax Explanatory                                                    
Mining tax rate on operating profit                           8.40% 8.40%                      
Top of range [member] | 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 disbursement made by the Company in connection with disputed tax assessments related to reviews by SUNAT from 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.