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COMMITMENTS AND CONTINGENCIES: - Environmental Costs (Details)
$ in Millions, MXN in Billions
 1 Months Ended 3 Months Ended 6 Months Ended 12 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
lawsuit
Mar. 31, 2016
lawsuit
Jun. 30, 2015
item
Dec. 31, 2016
MXN
item
Dec. 31, 2016
USD ($)
lawsuit
item
Dec. 31, 2015
USD ($)
lawsuit
item
Dec. 31, 2014
USD ($)
Dec. 31, 2011
category
person
Environmental costs                              
Environmental capital investment | $                       $ 250.4 $ 120.8 $ 152.2  
Amount of administrative fines and sanctions | $   $ 1.7                          
Number of collective action lawsuits                   6          
Number of subsidiaries against which lawsuits were filed                   2          
Number of lawsuits dismissed                   4          
Number of constitutional action lawsuits                         4    
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     5 5                      
Amount contributed to the Mexican Federal Government (in peso) | MXN                     MXN 1        
Number of civil actions seeking damages                 1     2 8    
Estimated total damages | $                       $ 136.4      
Amount already paid | $                       42.5      
Amount deposited in the trust                     MXN 1 74.9      
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 | $                       $ 110.3 $ 98.8 127.8  
Number of atmospheric basins established that require further attention                     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 | $                       $ 140.1 $ 22.0 $ 24.4  
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 | lawsuit 1                            
Francisca Garcia Enriquez                              
Environmental costs                              
Number of constitutional action lawsuits | lawsuit                         2    
Oscar Encinas Gamez et al                              
Environmental costs                              
Number of constitutional action lawsuits | lawsuit                 1            
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 constitutional action lawsuits | lawsuit               3