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Financial obligations (Details) - USD ($)
Dec. 31, 2019
Oct. 29, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 27, 2016
Jun. 30, 2014
Dec. 02, 2009
Disclosure of Financial obligations [Line Items]                  
Financial liabilities $ 571,688,000     $ 587,062,000 $ 633,083,000 $ 592,342,000      
Classification by maturity:                  
Current portion 265,692,000     46,166,000          
Non-current portion (f) 305,996,000     540,896,000          
Financial Liabilities 571,688,000     587,062,000 $ 633,083,000 $ 592,342,000      
Finance Lease Liabilities IAS17     $ 241,653,000            
Sociedad Minera El Brocal S.A.A. [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 161,185,000                
Financial liabilities 161,185,000     168,514,000          
Classification by maturity:                  
Financial Liabilities 161,185,000     168,514,000          
Finance Lease Liabilities IAS17       93,514,000          
Compaa de Minas Buenaventura S.A.A. [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 275,000,000     275,000,000     $ 275,000,000    
Debt issuance costs 2,504,000     3,618,000          
Borrowings 272,496,000     271,382,000          
BBVA Banco Continental S.A. [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 61,667,000     61,667,000          
BBVA Banco Continental S.A. [Member] | Contacto Corredores de Seguros S.A. [Member]                  
Classification by maturity:                  
Finance Lease Liabilities IAS17 7,503,000                
CorpBanca New York Branch [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 61,666,000     61,666,000          
Banco Internacional del Peru [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 30,000,000     30,000,000          
Banco Internacional del Peru [Member] | Empresa de Generacion Huanza S.A. [Member]                  
Classification by maturity:                  
Finance Lease Liabilities IAS17 130,504,000     147,166,000          
ICBC Peru Bank [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 25,000,000     25,000,000          
Banco Latinoamericano de Comercio Exterior S.A. [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 20,000,000     20,000,000          
Banco de Sabadell, Miami Branch [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 15,000,000     15,000,000          
Banco De Credito Del Peru - New Financial Obligation [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount   $ 161,893,850              
Banco De Credito Del Peru - New Financial Obligation [Member] | Sociedad Minera El Brocal S.A.A. [Member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount 161,894,000                
Debt issuance costs 709,000                
Banco de Credito del Peru [member]                  
Disclosure of Financial obligations [Line Items]                  
Notional amount $ 61,667,000     61,667,000       $ 103,373,000 $ 119,000,000
Banco de Credito del Peru [member] | Sociedad Minera El Brocal S.A.A. [Member]                  
Disclosure of Financial obligations [Line Items]                  
Debt issuance costs       976,000          
Classification by maturity:                  
Finance Lease Liabilities IAS17       94,490,000          
Mid-term financial obligation [Member] | Sociedad Minera El Brocal S.A.A. [Member]                  
Classification by maturity:                  
Finance Lease Liabilities IAS17       $ 75,000,000