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Financial obligations - Additional information (Details)
 1 Months Ended
Oct. 29, 2019
USD ($)
Mar. 28, 2018
USD ($)
Jun. 27, 2016
USD ($)
Jun. 30, 2014
USD ($)
Dec. 02, 2009
USD ($)
Jun. 27, 2016
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of Financial obligations [Line Items]                    
Equity             $ 2,968,200,000 $ 3,029,565,000 $ 3,063,627,000 $ 3,047,213,000
Bottom of range [member]                    
Disclosure of Financial obligations [Line Items]                    
Borrowings, interest rate             2.00% 2.00%    
Top of range [member]                    
Disclosure of Financial obligations [Line Items]                    
Borrowings, interest rate             2.95% 3.13%    
Compaa de Minas Buenaventura S.A.A. [Member]                    
Disclosure of Financial obligations [Line Items]                    
Notional amount     $ 275,000,000     $ 275,000,000 $ 275,000,000 $ 275,000,000    
Borrowings, interest rate basis   LIBOR of three months plus 2.15%       Three-month LIBOR plus 3%        
Borrowings, adjustment to interest rate basis   2.15% 3.00%     3.00%        
Borrowings, maturity   April 2022 June 30, 2021              
Borrowings Modified Repayment Terms   five semi-annual installments six semiannual installments              
Borrowings Periodic Repayment Amount   $ 55,000,000 $ 39,285,714     $ 39,285,714        
Final installment     $ 39,285,716              
Grace Period     2 years              
Compaa de Minas Buenaventura S.A.A. [Member] | Bottom of range [member]                    
Disclosure of Financial obligations [Line Items]                    
Debt service coverage ratio     4              
Equity     $ 2,711,388,800     $ 2,711,388,800        
Compaa de Minas Buenaventura S.A.A. [Member] | Top of range [member]                    
Disclosure of Financial obligations [Line Items]                    
Leverage ratio     3              
Banco De Credito Del Peru - New Financial Obligation [Member]                    
Disclosure of Financial obligations [Line Items]                    
Notional amount $ 161,893,850                  
Banco De Credito Del Peru - New Financial Obligation [Member] | Bottom of range [member]                    
Disclosure of Financial obligations [Line Items]                    
Debt service coverage ratio 1.3                  
Banco De Credito Del Peru - New Financial Obligation [Member] | Top of range [member]                    
Disclosure of Financial obligations [Line Items]                    
Leverage ratio 1.0                  
Indebtedness ratio 2.25                  
Banco De Credito Del Peru - New Financial Obligation Maturing on October 2024 [Member]                    
Disclosure of Financial obligations [Line Items]                    
Notional amount $ 113,325,695                  
Borrowings, interest rate 3.76%                  
Borrowings, maturity October 2024                  
Banco De Credito Del Peru - New Financial Obligation Maturing on October 2026 [Member]                    
Disclosure of Financial obligations [Line Items]                    
Notional amount $ 48,568,155                  
Borrowings, interest rate basis Three-month LIBOR plus 2.39 percent                  
Borrowings, adjustment to interest rate basis 2.39%                  
Borrowings, maturity October 2026                  
Banco de Credito del Peru [member]                    
Disclosure of Financial obligations [Line Items]                    
Notional amount       $ 103,373,000 $ 119,000,000   $ 61,667,000 $ 61,667,000    
Borrowings, interest rate basis       Three-month LIBOR plus 2.75 percent Three-month LIBOR plus 2.75 percent          
Borrowings, adjustment to interest rate basis       2.75% 2.75%          
Borrowings, maturity       November 2020 November 2020          
Borrowings Modified Repayment Terms       26 quarterly variable installments 26 quarterly variable installments          
Borrowings Periodic Repayment Amount       $ 18,373,000            
Final installment       $ 68,905,000 $ 44,191,000          
Banco de Credito del Peru [member] | Bottom of range [member]                    
Disclosure of Financial obligations [Line Items]                    
Debt service coverage ratio         1.1          
Equity         $ 30,000,000