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COMMITMENTS AND CONTINGENCIES: - Environmental Costs (Details)
$ in Millions, MXN in Billions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 22 Months Ended
Sep. 26, 2016
lawsuit
Mar. 02, 2015
USD ($)
Sep. 15, 2014
MXN
item
Sep. 15, 2014
USD ($)
item
Aug. 06, 2014
km
m³
Aug. 31, 2014
Mar. 31, 2014
Sep. 30, 2016
USD ($)
lawsuit
Jun. 30, 2015
lawsuit
item
Sep. 30, 2016
MXN
item
Sep. 30, 2016
USD ($)
item
Sep. 30, 2015
USD ($)
Dec. 31, 2015
lawsuit
item
Dec. 31, 2011
category
person
Jun. 30, 2016
MXN
Mar. 31, 2016
lawsuit
Environmental costs                                
Environmental capital investment | $                     $ 159.9 $ 76.2        
Amount of administrative fines and sanctions | $   $ 1.7                            
Number of collective action lawsuits                 6              
Number of subsidiaries against which lawsuits were filed | item                 2              
Number of lawsuits dismissed                 4              
Number of constitutional action lawsuits                         4      
Number of subsidiaries to which environmental impact authorizations were granted | item                         1      
Buenavista del Cobre, S.A. de C.V                                
Environmental costs                                
Volume of copper sulfate solution (in cubic meters) | m³         40,000                      
Distance of pond under construction from mine (in kilometers) | km         10                      
Number of zones | item     5 5                        
Amount contributed to the Mexican Federal Government (in peso) | MXN                             MXN 1  
Estimated total damages | $               $ 136.4     136.4          
Amount already paid | $               $ 42.3     42.3          
Amount deposited in the trust                   MXN 1 74.9          
Number of civil actions seeking damages                         8     1
Buenavista del Cobre, S.A. de C.V | Maximum                                
Environmental costs                                
Amount committed to the Mexican Federal Government to establish a trust     MXN 2 $ 150.0                        
Buenavista del Cobre, S.A. de C.V | Minimum                                
Environmental costs                                
Number of workers to clean the river           1,200                    
Peru                                
Environmental costs                                
Environmental capital investment | $                     $ 58.7 60.8        
Number of atmospheric basins established that require further attention | item                   3 3          
Number of months for identification of contaminated sites and around in facilities             12 months                  
Period for preparation of decontamination plan             P24M                  
Period of extension for preparation of decontamination plan             1 year                  
Number of days in which results of soil confirmation tests are to be presented to authorities             30 days                  
Mexico                                
Environmental costs                                
Environmental capital investment | $                     $ 101.2 $ 15.4        
Number of categories of collective actions | category                           3    
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) | person                           30    
Acciones Colectivas de Sinaloa                                
Environmental costs                                
Number of collective action lawsuits                 2              
Number of lawsuits dismissed 1                              
Francisca Garcia Enriquez                                
Environmental costs                                
Number of constitutional action lawsuits                         2      
Maria Elena Heredia Bustamante et al, Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al                                
Environmental costs                                
Number of additional constitutional lawsuits filed               3