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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, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Assets        
Cash and cash equivalents $ 235,449 $ 210,046 $ 369,200 $ 214,551
Trade and other receivables 333,177 376,227    
Income tax credit 19,837 31,919    
Total assets 3,979,617 4,107,274 4,217,221  
Liabilities        
Trade and other payables 179,956 166,860    
Income tax payable 3,162 5,650    
Total liabilities 1,179,760 1,139,074 1,187,656  
PEN        
Assets        
Cash and cash equivalents 8,606 6,796    
Income tax credit 19,837 31,919    
Total assets 187,542 178,339    
Liabilities        
Trade and other payables 47,705 60,311    
Income tax payable 3,162 5,650    
Total liabilities 89,441 107,476    
Net asset position 98,101 70,863    
Minera Yanacocha SRL and subsidiary [Member]        
Assets        
Cash and cash equivalents 870,929 818,503    
Trade and other receivables 49,720 42,610    
Total assets 2,313,438 2,312,072    
Liabilities        
Income tax payable 42,029 23,153    
Provisions, other accruals and liabilities 1,762,389 1,632,868    
Total liabilities 1,989,052 1,822,360    
Net loss from currency exchange     $ 2,056  
Net gain from currency exchange $ 1,180 $ 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 0.2764 0.3020    
Minera Yanacocha SRL and subsidiary [Member] | Sell        
Disclosure of basis for preparation, consolidation and accounting policies [Line Items]        
Closing foreign exchange rate | $ / shares 0.3020 0.3015    
Minera Yanacocha SRL and subsidiary [Member] | PEN        
Assets        
Cash and cash equivalents $ 6,242 $ 5,140    
Trade and other receivables 7,584 27,990    
Value added tax credit 25,214 32,831    
Total assets 39,040 65,961    
Liabilities        
Trade and other payables 48,200 13,085    
Income tax payable 37,779 23,153    
Provisions, other accruals and liabilities 25,774 29,633    
Total liabilities 111,753 65,871    
Net asset position $ (72,713) $ 90