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Financial - risk management objectives and policies - Carrying value versus fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value $ 571,688 $ 587,062 $ 633,083 $ 592,342
Minera Yanacocha SRL and subsidiary [Member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 905,784 823,703    
Financial assets at fair value 907,520 824,177    
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 121,007 125,894    
Financial liabilities at fair value 121,007 125,894    
Minera Yanacocha SRL and subsidiary [Member] | Cash and Cash Equivalents [Member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 818,503 723,208    
Financial assets at fair value 818,503 723,208    
Minera Yanacocha SRL and subsidiary [Member] | Trade receivables [member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 15,016 29,078    
Financial assets at fair value 15,016 29,078    
Minera Yanacocha SRL and subsidiary [Member] | Restricted Cash [Member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 48,617 48,127    
Financial assets at fair value 50,353 48,601    
Minera Yanacocha SRL and subsidiary [Member] | Financial assets at fair value [member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 23,648 23,290    
Financial assets at fair value 23,648 23,290    
Minera Yanacocha SRL and subsidiary [Member] | Trade And Other Payable [Member]        
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 76,484 83,464    
Financial liabilities at fair value 76,484 83,464    
Minera Yanacocha SRL and subsidiary [Member] | Provisions And Other Accruals [Member]        
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 596      
Financial liabilities at fair value 596      
Minera Yanacocha SRL and subsidiary [Member] | Debt Instrument [Member]        
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 43,927 42,430    
Financial liabilities at fair value $ 43,927 $ 42,430