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Tax situation (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 02, 2014
Oct. 01, 2013
USD ($)
Oct. 01, 2013
PEN (S/)
Feb. 14, 1998
Jan. 02, 2017
Dec. 31, 2014
USD ($)
Sep. 28, 2011
Dec. 31, 2011
USD ($)
Dec. 31, 2011
PEN (S/)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
PEN (S/)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
PEN (S/)
Sep. 30, 2011
USD ($)
Sep. 30, 2011
PEN (S/)
Dec. 31, 2009
USD ($)
Dec. 31, 2009
PEN (S/)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2016
PEN (S/)
Jun. 27, 2016
USD ($)
Dec. 31, 2014
PEN (S/)
Dec. 17, 2014
PEN (S/)
Disclosure Of Income Tax Explanatory [Line Items]                                                
Applicable tax rate                   29.50% 29.50% 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% 4.10%                  
Unused tax losses for which no deferred tax asset recognised                   $ 412,302,000   $ 415,149,000               S/ 1,337,919,000 S/ 1,347,159,000      
Mining royalties                   31,217,000   27,611,000   $ 27,188,000                    
Valuation allowance on deferred income tax asset                   51   386   510                    
Term of agreement of guarantees and measures to promote investments       15 years                                        
Current tax assets, non-current                   3,413,000   3,660,000                        
Tax Assessments Liability | S/                                             S/ 106,400,000 S/ 106,400,000
Penalties and interest unrecognised           $ 139,700,000                 S/ 139,700,000                  
Penalties and interest paid to government   $ 89,200,000                                            
Tax payment, Estimate of Possible Loss   $ 151,500,000 S/ 492,000,000                                          
Tax payment based on exchange rates                   141,700,000   141,700,000                        
Tax payment based on estimated due                   145,900,000 S/ 459,700,000   S/ 459,700,000                      
Penalties and interest for default tax               $ 7,800,000               $ 99,900,000   $ 56,200,000 S/ 289,200,000          
Notional amount                   275,000,000   275,000,000                   $ 275,000,000    
Mining royalties payable                   82,100,000   110,800,000               266,300,000 372,200,000      
Current tax expense (income)                   23,837,000   39,444,000   14,222,000                    
Current tax expense income relating to special mining tax                   102,600,000   14,900,000                        
Current tax expense income relating to mining royalties                   110,700,000   22,900,000                        
Current tax expense income relating to statutory retirement fund                   10,900,000   2,200,000                        
Deferred tax expense (income)                   (5,825,000)   14,060,000   541,000                    
Tax expense (income), continuing operations                   18,012,000   53,504,000   $ 14,763,000                    
Disputed mining royalties and special mining taxes for prior years included in current income tax expense                   245,900,000                            
Disputed mining royalties for prior period included in current income tax expense                   69,000,000                            
Special mining tax for prior period included in current income tax expense                   61,700,000                            
Tax on Statutory retirement fund for prior period included in current income tax expense                   5,900,000                            
Other taxes for prior period included in current income tax expense                   109,300,000                            
Other taxes included in deferred tax expense income                   (241,700,000)                            
Amount of the assessment, including interest and penalties               $ 15,300,000 S/ 49,800,000             $ 180,700,000 S/ 586,500,000 $ 89,100,000 S/ 289,200,000          
Net charges associated with disputed royalty assessments                   393,000,000                            
Potential unpaid penalties and interest                   385,000,000                            
Letters of Credit [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Notional amount                   $ 86,500,000   $ 115,300,000               S/ 280,800,000 S/ 387,500,000      
Bottom of range [member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Royalty rate on revenue 1.00%                                              
Top of range [member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Royalty rate on revenue 12.00%                                              
Notional amount           $ 800                                    
Peruvian government [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Applicable tax rate                   32.00% 32.00%                          
Minera Yanacocha SRL and subsidiary [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Applicable tax rate         29.50%         29.50% 29.50% 28.00% 28.00% 28.00%                    
Maximum mining tax rate on operating profit             12.00%                                  
Mining royalties                   $ 3,140,629   $ 3,742,000   $ 2,456,000                    
Employers contribution rate                   0.50% 0.50%                          
Employees Contribution Rate                   0.50% 0.50%                          
Income and mining tax expense                   $ 28,685   141,870   459,000                    
Current tax expense (income)                   7,026,000   43,127,000   118,913,000                    
Deferred tax expense (income)                   0   0   483,804,000                    
Tax expense (income), continuing operations                   7,026,000   43,127,000   602,717,000                    
Minera Yanacocha SRL and subsidiary [Member] | Special Mining Burden GEM [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Additional income and mining tax expense                   3,526,000   6,945,000   19,883,000                    
Minera Yanacocha SRL and subsidiary [Member] | Special mining tax rate IEM [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Mining tax expense                   $ 1,418,000   $ 3,259,000   $ 1,838,000                    
Minera Yanacocha SRL and subsidiary [Member] | Special mining tax rate IEM [Member] | Bottom of range [member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Mining tax rate on operating profit                   2.00% 2.00%                          
Minera Yanacocha SRL and subsidiary [Member] | Special mining tax rate IEM [Member] | Top of range [member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Mining tax rate on operating profit                   8.40% 8.40%                          
Minera Yanacocha SRL and subsidiary [Member] | Special mining burden rateGEM [Member] | Bottom of range [member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Mining tax rate on operating profit                   4.00% 4.00%                          
Minera Yanacocha SRL and subsidiary [Member] | Special mining burden rateGEM [Member] | Top of range [member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Mining tax rate on operating profit                   13.12% 13.12%                          
Minera Yanacocha SRL and subsidiary [Member] | Peruvian government [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Royalty rate on revenue             1.00%                                  
Minera Yanacocha SRL and subsidiary [Member] | Fiscal year 2015 [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Progressive income tax rate           28.00%                                    
Minera Yanacocha SRL and subsidiary [Member] | Fiscal year 2017 [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Progressive income tax rate           27.00%                                    
Minera Yanacocha SRL and subsidiary [Member] | Fiscal year 2019 [Member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Progressive income tax rate           26.00%                                    
Changes in tax rates or tax laws enacted or announced [member]                                                
Disclosure Of Income Tax Explanatory [Line Items]                                                
Applicable Tax Rate With Respect To Results Obtained                   5.00% 5.00%