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Provisions, contingent liabilities and other liabilities - Additional information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Dec. 31, 2017
USD ($)
Provisions and contingent liabilities            
Current provisions   $ 72,771     $ 68,000  
Provision for closure of mining units and exploration projects at future value   $ 252,300     309,300  
Period Used To Reflect Time Value Of Money For Provisions   22 years        
Letter of credit   $ 121,400   S/ 1,780,126,238 $ 140,000  
Annual risk free rate       1.56% 1.56%  
Increase (decrease) through transfers and other changes, other provisions $ 37,600 $ 60,000        
Minimum            
Provisions and contingent liabilities            
Discount rate used to reflect time value of money for provisions   1.79%   0.31% 0.31%  
Period Used To Reflect Time Value Of Money For Provisions 1 year 1 year        
Maximum            
Provisions and contingent liabilities            
Discount rate used to reflect time value of money for provisions   3.12%   2.77% 2.77%  
Period Used To Reflect Time Value Of Money For Provisions 20 years          
Provision for remediation and mine closure [Member]            
Provisions and contingent liabilities            
Other non-current provisions   $ 195,900 $ 131,888   $ 237,543  
Future value of non current provisions   $ 374,400     374,400  
Annual risk free rate   2.28%        
Provision for disputed mining royalties (c )            
Provisions and contingent liabilities            
Interest and penalties associated with income tax related to disputed mining royalties         45,000  
Miscellaneous other provisions [member]            
Provisions and contingent liabilities            
Provision for unfavorable results from SUNAT assessments   $ 3,800     9,600  
Interest and penalties associated with SUNAT   4,300     12,900  
Provision for royalties and mining tax [Member]            
Provisions and contingent liabilities            
Interest and penalties associated with income tax related to disputed mining royalties   42,100        
Interest and penalties associated with ITAN   6,700        
Interest and penalties associated with SRF   1,900        
Net asset tax included in provisions   12,100        
La Joya [Member] | Irrigation Project [Member] | Provision for social commitments [Member]            
Provisions and contingent liabilities            
Other provisions         4,400  
Alata-Congata Road [Member] | Repaving Project [Member] | Provision for social commitments [Member]            
Provisions and contingent liabilities            
Other provisions         6,300  
Minera Yanacocha SRL and subsidiary [Member]            
Provisions and contingent liabilities            
Current provisions   45,317     101,786  
Provision for closure of mining units and exploration projects   1,608,380 1,294,464   1,738,428 $ 1,234,731
Employee's profit share on annual taxable income 8.00%          
Other provisions   6,162     7,352  
Other non-current provisions   1,587,551     1,660,603  
Increase in reclamation liability $ 121,000 301,000 44,000      
Increase in recorded asset retirement cost 4,000 159,000 27,200      
Non-cash charge to reclamation expense $ 124,000 $ 142,000 $ 16,300      
Minera Yanacocha SRL and subsidiary [Member] | Minimum            
Provisions and contingent liabilities            
Discount rates used in the calculation of the provision 0.40% 0.40% 0.40%      
Minera Yanacocha SRL and subsidiary [Member] | Maximum            
Provisions and contingent liabilities            
Discount rates used in the calculation of the provision 6.00% 6.00% 6.00%      
Sociedad Minera Cerro Verde Saa [Member]            
Provisions and contingent liabilities            
Other non-current provisions   $ 278,419     307,974  
Sociedad Minera Cerro Verde Saa [Member] | Provision for social commitments [Member]            
Provisions and contingent liabilities            
Other non-current provisions   3,046     1,226  
Sociedad Minera Cerro Verde Saa [Member] | Provision for remediation and mine closure [Member]            
Provisions and contingent liabilities            
Other non-current provisions   195,659     237,387  
Sociedad Minera Cerro Verde Saa [Member] | Provision for disputed mining royalties (c )            
Provisions and contingent liabilities            
Other non-current provisions   $ 62,797     44,982  
Sociedad Minera Cerro Verde Saa [Member] | Ministry of Energy and Mines [Member]            
Provisions and contingent liabilities            
Letter of credit         $ 59,400