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COMMITMENTS AND CONTINGENCIES: - Enviormental Costs (Details)
$ in Millions, MXN in Billions
 1 Months Ended 6 Months Ended 12 Months Ended 22 Months Ended
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
Jun. 30, 2016
MXN
item
Jun. 30, 2016
USD ($)
item
Jun. 30, 2015
USD ($)
item
Dec. 31, 2014
item
Dec. 31, 2015
item
Jun. 30, 2015
item
Dec. 31, 2011
category
person
Jun. 30, 2016
MXN
Mar. 31, 2016
item
Environmental costs                              
Environmental capital investment | $               $ 105.7 $ 44.9            
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                     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  
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                     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 | $               $ 36.2 $ 38.0            
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 | $               $ 69.5 $ 6.9            
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