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Financial - risk management objectives and policies - Carrying value versus fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value $ 531,653 $ 571,688 $ 587,062 $ 633,083
Financial liabilities at fair value 531,745 571,688    
Minera Yanacocha SRL and subsidiary [Member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 98,086 87,281    
Financial assets at fair value 98,376 89,017    
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 45,423 43,927    
Financial liabilities at fair value 47,479 45,633    
Minera Yanacocha SRL and subsidiary [Member] | Trade receivables [member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 27,658 15,016    
Financial assets at fair value 27,658 15,016    
Minera Yanacocha SRL and subsidiary [Member] | Restricted Cash [Member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 48,752 48,617    
Financial assets at fair value 49,042 50,353    
Minera Yanacocha SRL and subsidiary [Member] | Financial assets at fair value [member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 21,676 23,648    
Financial assets at fair value 21,676 23,648    
Minera Yanacocha SRL and subsidiary [Member] | Debt Instrument [Member]        
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 45,423 43,927    
Financial liabilities at fair value $ 47,479 $ 45,633