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Basis for preparation, consolidation and accounting policies - Assets and liabilities originally denominated in Soles (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Assets        
Cash and cash equivalents $ 210,046 $ 369,200 $ 214,551 $ 80,544
Trade and other receivables 376,227 252,308    
Prepaid income tax 31,919 24,396    
Total assets 4,107,274 4,217,221 4,332,813  
Liabilities        
Trade and other payables 166,860 188,723    
Income tax payable 5,650 1,760    
Total liabilities 1,139,074 1,187,656 1,269,186  
PEN        
Assets        
Cash and cash equivalents 6,796 11,526    
Prepaid income tax 31,960 24,277    
Total assets 178,380 124,316    
Liabilities        
Trade and other payables 60,311 53,962    
Income tax payable 5,692 2,080    
Total liabilities 107,518 87,324    
Net asset position 70,862 36,992    
Minera Yanacocha SRL and subsidiary [Member]        
Assets        
Cash and cash equivalents 818,503 723,208    
Trade and other receivables 42,610 55,900    
Prepaid income tax 0 19,239    
Total assets 2,312,072 2,047,472    
Liabilities        
Income tax payable 23,153 3,552    
Provisions, other accruals and liabilities ieses 1,629,190 1,315,259    
Total liabilities 1,822,360 1,463,749    
Net loss from currency exchange   $ 2,056 $ 3,636  
Net gain from currency exchange $ 2,902      
Minera Yanacocha SRL and subsidiary [Member] | Buy        
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]        
Closing foreign exchange rate | $ / shares 0.3020 0.2968    
Minera Yanacocha SRL and subsidiary [Member] | Sell        
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]        
Closing foreign exchange rate | $ / shares 0.3015 0.2959    
Minera Yanacocha SRL and subsidiary [Member] | PEN        
Assets        
Cash and cash equivalents $ 5,140 $ 7,563    
Trade and other receivables 27,990 27,335    
Prepaid income tax   19,239    
Value added tax credit 32,831 29,828    
Total assets 65,961 83,965    
Liabilities        
Trade and other payables 13,085 9,586    
Income tax payable 23,153 3,552    
Provisions, other accruals and liabilities ieses 29,633 3,970    
Total liabilities 65,871 17,108    
Net asset position $ 90 $ 66,857