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COMMITMENTS AND CONTINGENCIES: (Details)
$ in Millions, MXN in Billions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 02, 2015
USD ($)
item
Sep. 15, 2014
MXN
Sep. 15, 2014
USD ($)
Sep. 15, 2014
item
Aug. 29, 2014
Aug. 06, 2014
km
m³
Mar. 31, 2014
Mar. 31, 2016
MXN
item
Mar. 31, 2016
USD ($)
item
Sep. 30, 2015
item
Jun. 30, 2015
item
Mar. 31, 2015
USD ($)
Jun. 30, 2015
item
Dec. 31, 2014
item
Dec. 31, 2015
item
Dec. 31, 2011
category
person
Environmental costs                                
Environmental capital investment | $                 $ 39.2     $ 20.6        
Amount of administrative fines and sanctions | $ $ 1.7                              
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               1 1           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                        
Amount committed to the Mexican Federal Government to establish a trust   MXN 2 $ 150.0                          
Amount contributed to the Mexican Federal Government (in peso) | MXN               MXN 1                
Number of administrative proceedings 4                              
Estimated total damages | $                 $ 136.4              
Amount already paid | $                 41.1              
Amount deposited in the trust               MXN 1 $ 74.9              
Number of civil actions seeking damages                 1           8  
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 | $                 $ 10.1     17.4        
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 | $                 $ 29.1     $ 3.2        
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
Francisca Garcia Enriquez                                
Environmental costs                                
Number of constitutional action lawsuits                   2 2