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COMMITMENTS AND CONTINGENCIES: (Details 3)
PEN in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jul. 31, 2014
MW
Jun. 30, 2014
MW
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
MW
Dec. 31, 2015
USD ($)
m
Dec. 31, 2015
USD ($)
ft
Dec. 31, 2015
USD ($)
mi
Dec. 31, 2015
USD ($)
km
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
item
Dec. 31, 2015
USD ($)
T
Dec. 31, 2015
PEN
Dec. 31, 2015
USD ($)
Dec. 31, 2014
PEN
Dec. 31, 2014
USD ($)
Dec. 31, 2005
item
Dec. 31, 1997
Other commitments:                                  
Commitments for development of capital investment projects                         $ 2,225.7        
Tia Maria | Peru                                  
Other commitments:                                  
Project budget                         1,400.0        
Carrying Amount invested in the project     $ 361.5 $ 361.5 $ 361.5 $ 361.5 $ 361.5 $ 361.5 $ 361.5 $ 361.5 $ 361.5   361.5        
Annual production ( in tons) | T                     120,000            
Distance of sea water transportation             15.5 25                  
Height above sea level of the desalinization plant         1,000 3,300                      
Additional investment in desalinization plant                         95.0        
Number of jobs expected to be generated | item                   3,500              
Number of workers expected to be directly employed | item                   600              
Number of workers expected to be indirectly employed | item                   2,000              
Expected life of project related service     20 years                            
Amount expended for funding social and infrastructure improvement projects                             $ 29.0    
Amount committed to funding for social and infrastructure improvement projects | PEN                           PEN 100.0      
Toquepala Concentrator Expansion | Peru                                  
Other commitments:                                  
Project budget                         1,200.0        
Carrying Amount invested in the project     $ 392.0 $ 392.0 $ 392.0 $ 392.0 $ 392.0 $ 392.0 $ 392.0 $ 392.0 $ 392.0   392.0        
Amount committed to funding for social and infrastructure improvement projects                       PEN 445.0 $ 130.0        
MGE                                  
Other commitments:                                  
Related party transactions number of power plants to be contructed | item                               2  
Percentage of supply to third-party energy users                 12.00%                
MGE | Mexico                                  
Other commitments:                                  
Net total capacity (in megawatts) | MW       516.2                          
Copper | Toquepala Concentrator Expansion | Peru                                  
Other commitments:                                  
Estimated increase in annual production (in tons) | T                     100,000            
Molybdenum | Toquepala Concentrator Expansion | Peru                                  
Other commitments:                                  
Estimated increase in annual production (in tons) | T                     3,100            
Power purchase agreements | Enersur                                  
Other commitments:                                  
Term of power purchase agreement related to sale of power plant                                 20 years
Power purchase agreements | Electroperu S.A | Peru                                  
Other commitments:                                  
Term of power purchase agreement related to sale of power plant   20 years                              
Number of megawatt supply energy for which the entity signed the agreement | MW   120                              
Power purchase agreements | Kallpa | Peru                                  
Other commitments:                                  
Term of power purchase agreement related to sale of power plant 10 years                                
Number of megawatt supply energy for which the entity signed the agreement | MW 120