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COMMITMENTS AND CONTINGENCIES: - Litigation matters (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2016
lawsuit
Jun. 30, 2019
lawsuit
Jun. 30, 2015
lawsuit
item
Dec. 31, 2015
lawsuit
item
Dec. 31, 2017
lawsuit
Dec. 31, 2016
item
Litigation Matter            
Number of collective action lawsuits     6      
Number of collective action lawsuits dismissed     2      
Remaining number of lawsuits     4      
Number of civil actions seeking damages         33  
Number Of Constitutional Action Lawsuits       4    
Number of subsidiaries to which environmental impact authorizations were granted | item       1    
Number of subsidiaries against which lawsuits were filed | item     2      
Tia Maria            
Litigation Matter            
Number of lawsuits   4        
Buenavista del Cobre, S.A. de C.V            
Litigation Matter            
Number of civil actions seeking damages | item       8   3
Francisca Garcia Enriquez            
Litigation Matter            
Number of additional constitutional lawsuits filed       2    
Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al            
Litigation Matter            
Number of additional constitutional lawsuits filed 4          
Norberto Bustamante et al            
Litigation Matter            
Number of additional constitutional lawsuits filed   2