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Commitments and contingencies - Subsidiaries - Sociedad Minera El Brocal S.A.A (Details)
 12 Months Ended
Dec. 30, 2020
PEN (S/)
item
Dec. 30, 2020
USD ($)
item
Dec. 18, 2020
PEN (S/)
Dec. 18, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
PEN (S/)
item
Jan. 07, 2021
PEN (S/)
Jan. 07, 2021
USD ($)
Jan. 05, 2021
PEN (S/)
Jan. 05, 2021
USD ($)
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Dec. 30, 2020
USD ($)
Jan. 27, 2020
PEN (S/)
Jan. 27, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 08, 2015
PEN (S/)
Jan. 08, 2015
USD ($)
Jun. 18, 2014
PEN (S/)
Jun. 18, 2014
USD ($)
Disclosure of Commitments and contingencies [Line Items]                                        
Contingent liability                     S/ 43,462,000 $ 11,993,000                
El Brocal                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Contingent liability                     S/ 5,220,000 $ 1,445,000                
Amount disbursed recorded as an account receivable             S/ 7,871,000 $ 2,172,000                        
SUNAT                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Tax assessment value                 S/ 1,505,948,000 $ 415,549,000                    
SUNAT | El Brocal | Development cost of Smelter Project                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Depreciation of the tailings     S/ 6,108,000 $ 1,661,000                                
Year 2011 [Member] | SUNAT | El Brocal                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Income tax liabilities                                     S/ 8,333,000 $ 2,303,000
Year 2012 [Member] | SUNAT | El Brocal                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Tax assessment value                                 S/ 4,030,000 $ 1,112,000    
Tax year 2014 [Member] | SUNAT | El Brocal                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Number of tailings depreciation rate questioned 2 2                                    
Tax year 2014 [Member] | SUNAT | El Brocal | Development cost of Smelter Project                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Contingent liability S/ 10,902,000                       $ 3,008,000              
Development cost S/ 16,582,000 $ 4,576,000                                    
Year 2015 [Member] | SUNAT | El Brocal                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Number of tailings depreciation rate questioned           2                            
Amount disbursed recorded as an account receivable                           S/ 1,456,000 $ 402,000          
Year 2015 [Member] | SUNAT | El Brocal | Development cost of Smelter Project                                        
Disclosure of Commitments and contingencies [Line Items]                                        
Contingent liability           S/ 3,412,000                   $ 942,000        
Development cost         $ 3,844,000 S/ 13,930,000