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Subsidiaries with material non-controlling interest - Statements of financial position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets $ 648,619 $ 761,134    
Non-current assets 3,458,655 3,456,087    
Current liabilities (565,357) (399,182)    
Non-current liabilities (573,717) (788,474)    
Total shareholders' equity, net 2,968,200 3,029,565 $ 3,063,627 $ 3,047,213
Shareholders of the parent 2,771,522 2,808,328    
Non-controlling interests 196,678 221,237 $ 215,590  
Sociedad Minera El Brocal S.A.A. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 149,945 170,274    
Non-current assets 576,028 603,280    
Current liabilities (118,965) (123,052)    
Non-current liabilities (210,904) (217,683)    
Total shareholders' equity, net 396,104 432,819    
Shareholders of the parent 234,187 255,841    
Non-controlling interests 161,917 176,978    
Minera La Zanja S.R.L. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 112,420 126,878    
Non-current assets 26,038 31,841    
Current liabilities (20,170) (25,834)    
Non-current liabilities (47,930) (42,781)    
Total shareholders' equity, net 70,358 90,104    
Shareholders of the parent 37,332 47,809    
Non-controlling interests 33,026 42,295    
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 6,252 7,154    
Non-current assets 0 0    
Current liabilities (2,286) (2,653)    
Non-current liabilities 0 0    
Total shareholders' equity, net 3,966 4,501    
Shareholders of the parent 2,379 2,701    
Non-controlling interests 1,587 1,800    
Apu Coropuna S.R.L. [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Current assets 2,141 2,263    
Non-current assets 185 182    
Current liabilities (1,094) (1,165)    
Non-current liabilities (740) (739)    
Total shareholders' equity, net 492 541    
Shareholders of the parent 344 377    
Non-controlling interests $ 148 $ 164