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Financial - risk management objectives and policies - Carrying value versus fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value $ 1,057,975 $ 531,653 $ 571,688 $ 587,062
Financial liabilities at fair value 1,059,236 475,624    
Minera Yanacocha SRL and subsidiary [Member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 85,938 98,086    
Financial assets at fair value 85,938 98,376    
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 133,739 114,068    
Financial liabilities at fair value 133,739 116,124    
Minera Yanacocha SRL and subsidiary [Member] | Trade receivables [member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 37,105 27,658    
Financial assets at fair value 37,105 27,658    
Minera Yanacocha SRL and subsidiary [Member] | Restricted Cash [Member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 48,752 48,752    
Financial assets at fair value 48,752 49,042    
Minera Yanacocha SRL and subsidiary [Member] | Financial assets at fair value [member]        
Disclosure of financial assets [abstract]        
Financial assets at carrying value 81 21,676    
Financial assets at fair value 81 21,676    
Minera Yanacocha SRL and subsidiary [Member] | Trade And Other Payable [Member]        
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 86,659 68,645    
Financial liabilities at fair value 86,659 68,645    
Minera Yanacocha SRL and subsidiary [Member] | Debt Instrument [Member]        
Disclosure of financial liabilities [abstract]        
Financial liabilities at carrying value 47,080 45,423    
Financial liabilities at fair value $ 47,080 $ 47,479