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Subsidiaries with material non-controlling interest (Details) - USD ($)
$ in Thousands
 12 Months Ended 36 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Accumulated balances of material non-controlling interest:        
Non-controlling interests $ 172,397 $ 196,678 $ 221,237 $ 172,397
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests (14,621) (16,251) 1,791  
Sociedad Minera El Brocal S.A.A        
Accumulated balances of material non-controlling interest:        
Non-controlling interests 144,501 161,917   144,501
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests (12,895) (13,432) 2,880  
Minera La Zanja S.R.L. [Member]        
Accumulated balances of material non-controlling interest:        
Non-controlling interests 26,121 33,026   26,121
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests (6,905) (9,090) (6,346)  
S.M.R.L. Chaupiloma Dos de Cajamarca [Member]        
Accumulated balances of material non-controlling interest:        
Non-controlling interests 1,648 1,587   1,648
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests 5,201 6,286 5,667  
Apu Coropuna S.R.L. [Member]        
Accumulated balances of material non-controlling interest:        
Non-controlling interests 127 148   $ 127
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests (22) (14) (410)  
Other minor subsidiaries [Member]        
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests 0 (1) 0  
Country of domicile [member] | Sociedad Minera El Brocal S.A.A        
Equity interest held by non-controlling interests:        
Proportion of ownership interests held by non-controlling interests       38.57%
Accumulated balances of material non-controlling interest:        
Non-controlling interests 144,501 161,917 176,978 $ 144,501
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests (12,895) (13,432) 2,880  
Country of domicile [member] | Minera La Zanja S.R.L. [Member]        
Equity interest held by non-controlling interests:        
Proportion of ownership interests held by non-controlling interests       46.94%
Accumulated balances of material non-controlling interest:        
Non-controlling interests 26,121 33,026 42,295 $ 26,121
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests (6,905) (9,090) (6,346)  
Country of domicile [member] | S.M.R.L. Chaupiloma Dos de Cajamarca [Member]        
Equity interest held by non-controlling interests:        
Proportion of ownership interests held by non-controlling interests       40.00%
Accumulated balances of material non-controlling interest:        
Non-controlling interests 1,648 1,587 1,800 $ 1,648
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests 5,201 6,286 5,667  
Country of domicile [member] | Apu Coropuna S.R.L. [Member]        
Equity interest held by non-controlling interests:        
Proportion of ownership interests held by non-controlling interests       30.00%
Accumulated balances of material non-controlling interest:        
Non-controlling interests 127 148 164 $ 127
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests (22) (14) (410)  
Country of domicile [member] | Other minor subsidiaries [Member]        
Profit (loss) allocated to material non-controlling interest:        
Profit (loss), attributable to non-controlling interests $ 0 $ (1) $ 0