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Subsidiaries with material non-controlling interest - Statements of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets $ 589,152 $ 648,619    
Non-current assets 3,390,465 3,458,655    
Current liabilities (360,436) (565,357)    
Non-current liabilities (819,324) (573,717)    
Total shareholders' equity, net 2,799,857 2,968,200 $ 3,029,565 $ 3,063,627
Shareholders of the parent 2,627,460 2,771,522    
Non-controlling interests 172,397 196,678 $ 221,237  
Sociedad Minera El Brocal S.A.A        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 166,396 149,945    
Non-current assets 553,754 576,028    
Current liabilities (170,896) (118,965)    
Non-current liabilities (195,809) (210,904)    
Total shareholders' equity, net 353,445 396,104    
Shareholders of the parent 208,944 234,187    
Non-controlling interests 144,501 161,917    
Minera La Zanja S.R.L. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 104,076 112,420    
Non-current assets 30,486 26,038    
Current liabilities (22,329) (20,170)    
Non-current liabilities (56,587) (47,930)    
Total shareholders' equity, net 55,646 70,358    
Shareholders of the parent 29,525 37,332    
Non-controlling interests 26,121 33,026    
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 6,814 6,252    
Non-current assets 0 0    
Current liabilities (2,694) (2,286)    
Non-current liabilities 0 0    
Total shareholders' equity, net 4,120 3,966    
Shareholders of the parent 2,472 2,379    
Non-controlling interests 1,648 1,587    
Apu Coropuna S.R.L. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 2,064 2,141    
Non-current assets 169 185    
Current liabilities (1,071) (1,094)    
Non-current liabilities (740) (740)    
Total shareholders' equity, net 422 492    
Shareholders of the parent 295 344    
Non-controlling interests $ 127 $ 148