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Commitments and contingencies - Subsidiaries - Sociedad Minera El Brocal S.A.A (Details)
 12 Months Ended
May 21, 2021
USD ($)
May 21, 2021
PEN (S/)
Dec. 30, 2020
USD ($)
item
Dec. 30, 2020
PEN (S/)
item
Dec. 18, 2020
USD ($)
Dec. 18, 2020
PEN (S/)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
PEN (S/)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
PEN (S/)
item
Dec. 31, 2021
PEN (S/)
Jan. 07, 2021
USD ($)
Jan. 07, 2021
PEN (S/)
Jan. 05, 2021
USD ($)
Jan. 05, 2021
PEN (S/)
Dec. 31, 2020
PEN (S/)
Dec. 30, 2020
PEN (S/)
Jan. 27, 2020
USD ($)
Jan. 27, 2020
PEN (S/)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
PEN (S/)
Jan. 08, 2015
USD ($)
Jan. 08, 2015
PEN (S/)
Jun. 18, 2014
USD ($)
Jun. 18, 2014
PEN (S/)
Disclosure of Commitments and contingencies [Line Items]                                                  
Contingent liability             $ 9,902,000   $ 10,871,000   S/ 39,590,000         S/ 43,462,000                  
El Brocal                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Contingent liability             1,274,000   1,445,000   5,468,000         S/ 5,220,000                  
Amount disbursed recorded as an account receivable                       $ 1,980,000 S/ 7,871,000                        
SUNAT.                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Tax assessment value                           $ 376,675,000 S/ 1,505,948,000                    
Contingent liability             2,626,000       10,500,000                            
SUNAT. | Development cost of Smelter Project                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Amount of fine returned             755,000 S/ 3,003,000                                  
Accounts receivable             1,225,000       4,868,000                            
SUNAT. | El Brocal | Development cost of Smelter Project                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Depreciation of the tailings $ 1,505,000 S/ 6,018,000     $ 1,505,000 S/ 6,108,000                                      
Amount of fine returned             115,000 S/ 459,000                                  
Accounts receivable             $ 251,000       S/ 997,000                            
Development cost $ 1,347,000 S/ 5,384,000                                              
Year 2011 [Member] | SUNAT. | El Brocal                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Income tax liabilities                                               $ 2,096,000 S/ 8,333,000
Year 2012 [Member] | SUNAT. | El Brocal                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Tax assessment value                                           $ 1,008,000 S/ 4,030,000    
Year 2014 [Member] | SUNAT. | El Brocal                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Number of tailings depreciation rate questioned     2 2                                          
Year 2014 [Member] | SUNAT. | El Brocal | Development cost of Smelter Project                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Contingent liability     $ 2,727,000                           S/ 10,902,000                
Development cost     $ 4,148,000 S/ 16,582,000                                          
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                                   $ 366,000 S/ 1,456,000            
Year 2015 [Member] | SUNAT. | El Brocal | Development cost of Smelter Project                                                  
Disclosure of Commitments and contingencies [Line Items]                                                  
Contingent liability                                       $ 853,000 S/ 3,412,000        
Development cost                 $ 3,484,000 S/ 13,930,000