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COMMITMENTS AND CONTINGENCIES: (Details 3)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Dec. 31, 1997
Power purchase agreements
Enersur
Jun. 30, 2014
Peruvian operations
Power purchase agreements
Electroperu S.A
MW
Jul. 31, 2014
Peruvian operations
Power purchase agreements
Kallpa
MW
Jun. 30, 2014
Mexican Operations
USD ($)
Dec. 31, 2013
Tia Maria
Peruvian operations
item
Jun. 30, 2014
Tia Maria
Peruvian operations
USD ($)
Jun. 30, 2014
Toquepala Concentrator Expansion
Copper
T
Jun. 30, 2014
Toquepala Concentrator Expansion
Molybdenum
T
Nov. 30, 2013
Toquepala Concentrator Expansion
Peruvian operations
USD ($)
Nov. 30, 2013
Toquepala Concentrator Expansion
Peruvian operations
PEN
Feb. 28, 2013
Toquepala Concentrator Expansion
Peruvian operations
USD ($)
item
Feb. 28, 2013
Toquepala Concentrator Expansion
Peruvian operations
PEN
Jun. 30, 2013
Toquepala Concentrator Expansion
Peruvian operations
USD ($)
Jun. 30, 2013
Toquepala Concentrator Expansion
Peruvian operations
PEN
Jun. 30, 2014
MGE
Dec. 31, 2005
MGE
item
Jun. 30, 2014
MGE
Mexican Operations
item
Other commitments:                                  
Number of work-shops successfully held         2                        
Total spending for the project           $ 537.0                      
Equipment reassigned to other operations, carrying value           189.5                      
Term of power purchase agreement related to sale of power plant 20 years 20 years 10 years                            
Number of provinces for which final agreement reached                     1 1          
Number of megawatt supply energy for which the entity signed the agreement   120 120                            
Estimated increase in annual production (in tons)             100,000 3,100                  
Amount committed to funding for development projects in the Candarave province                     100 255          
Amount paid-out for development projects in the Candarave province                         17 45      
Amount committed to funding for development projects in the Jorge Basadre province                 36 100              
Number of power plants                               2 2
Percentage of supply to third-party energy users                             12.00%    
Commitment for capital projects       $ 368.3