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Investments in associates (Details 6) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Investments in associates [Line Items]        
Current assets $ 701,862 $ 501,928    
Non-current assets 3,630,951 3,764,487    
Current liabilities 521,194 445,125    
Non-current liabilities 747,992 774,077    
Shareholders’ equity, reported 3,063,627 3,047,213 $ 3,389,236 $ 3,762,125
Group’s interest (40.095%) 1,536,887 1,536,607 2,043,983  
Compania Minera Coimolache S.A. [Member]        
Disclosure of Investments in associates [Line Items]        
Current assets 101,668 73,480    
Non-current assets 278,866 261,075    
Current liabilities (44,411) (28,532)    
Non-current liabilities (106,332) (102,519)    
Shareholders’ equity, reported 229,791 203,504    
Adjustments to conform to the accounting policies of the Group (14,843) (17,111)    
Shareholders’ equity, adjusted 214,948 186,393    
Group’s interest (40.095%) $ 86,183 $ 74,734 $ 0