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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
Jun. 30, 2015
MXN
item / m³
item
Jun. 30, 2015
USD ($)
item / m³
item
Dec. 31, 2014
item
Jun. 30, 2014
USD ($)
Dec. 31, 2013
Dec. 31, 2011
category
person
Environmental costs                          
Environmental capital investment | $                 $ 40.0   $ 61.4    
Amount of administrative fines and sanctions (in pesos) MXN 23.5 $ 1.7                      
Number of lawsuits               6 6 6      
Number of civil actions seeking damages               7 7        
Number of subsidiaries against which lawsuits were filed               2 2        
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 (in peso)     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                      
Number of workers hired         1,200                
Estimated contingent liability | $                 $ 97.3        
Amount already paid | $                 16.4        
Amount deposited in the trust (in peso)               MXN 1,000.0 $ 74.9        
Number of civil actions seeking damages               4 4        
Peru                          
Environmental costs                          
Environmental capital investment | $                 $ 33.1   53.9    
Period required for ambient air monitoring as per environmental regulation                       1 day  
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 | $                 $ 6.9   $ 7.5    
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