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Financial obligations (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 27, 2016
Dec. 31, 2015
Dec. 02, 2009
Disclosure of Financial obligations [Line Items]            
Notional amount $ 275,000,000 $ 275,000,000   $ 275,000,000    
Debt issuance costs (3,618,000) (2,425,000)        
Borrowings 271,382,000 272,575,000        
Financial liabilities 587,062,000 633,083,000 $ 592,342,000   $ 353,710,000  
Classification by maturity:            
Current portion 46,166,000 83,991,000        
Non-current portion (f) 540,896,000 549,092,000        
Financial Liabilities 587,062,000 633,083,000 $ 592,342,000   $ 353,710,000  
Empresa de Generacion Huanza S.A. [Member]            
Classification by maturity:            
Finance lease liabilities           $ 119,000,000
Sociedad Minera El Brocal S.A.A. [Member]            
Disclosure of Financial obligations [Line Items]            
Debt issuance costs (976,000) (1,377,000)        
Financial liabilities 168,514,000 198,087,000        
Classification by maturity:            
Financial Liabilities 168,514,000 198,087,000        
Finance lease liabilities 93,514,000 118,087,000        
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 0 10,000        
Banco de Credito del Peru [Member]            
Disclosure of Financial obligations [Line Items]            
Notional amount 61,667,000 61,667,000        
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 94,490,000 119,464,000        
Banco Internacional del Peru [Member] | Sociedad Minera El Brocal S.A.A. [Member]            
Classification by maturity:            
Finance lease liabilities 147,166,000 162,411,000        
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        
Mid-term financial obligation [Member] | Sociedad Minera El Brocal S.A.A. [Member]            
Classification by maturity:            
Finance lease liabilities $ 75,000,000 $ 80,000,000