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COMMITMENTS AND CONTINGENCIES: (Details)
MXN in Millions, $ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Mar. 02, 2015
MXN
item
Mar. 02, 2015
USD ($)
item
Sep. 15, 2014
MXN
Sep. 15, 2014
USD ($)
Aug. 29, 2014
Aug. 06, 2014
km
m³
Mar. 31, 2014
Sep. 30, 2015
item
Jun. 30, 2015
item
Dec. 31, 2014
item
Dec. 31, 2015
MXN
item / m³
item
Dec. 31, 2015
USD ($)
item / m³
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2011
category
person
Environmental costs                              
Environmental capital investment | $                       $ 120.8 $ 152.2 $ 116.7  
Number of collective action lawsuits                 6 6          
Number of subsidiaries against which lawsuits were filed                     2 2      
Number of lawsuits dismissed                     3 3      
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 committed to the Mexican Federal Government to establish a trust     MXN 2,000.0 $ 150.0                      
Amount contributed to the Mexican Federal Government (in peso) | MXN                     MXN 1,000.0        
Number of administrative proceedings 4 4                          
Amount of administrative fines and sanctions MXN 23.5 $ 1.7                          
Number of workers hired         1,200                    
Estimated total damages | $                       $ 136.4      
Amount already paid | $                       39.9      
Amount deposited in the trust                     MXN 1,000.0 $ 74.9      
Number of civil actions seeking damages                     8 8      
Peru                              
Environmental costs                              
Environmental capital investment | $                       $ 98.8 127.8 76.9  
Air quality standards level for sulfur dioxide to be maintained when emission is excess than specified as per new environmental regulation (in micrograms per cubic meter) | item / m³                     80 80      
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                
Peru | Maximum                              
Environmental costs                              
Revised air quality standards for sulfur dioxide as per new environmental regulation (in micrograms per cubic meter) | item / m³                     20 20      
Mexico                              
Environmental costs                              
Environmental capital investment | $                       $ 22.0 $ 24.4 $ 39.8  
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 2      
Francisco Garcia Enriquez                              
Environmental costs                              
Number of constitutional action lawsuits               2