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RELATED PARTY TRANSACTIONS: (Details)
 12 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
Minera Mexico
Dec. 31, 2012
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
USD ($)
Dec. 31, 2011
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
USD ($)
Dec. 31, 2010
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
USD ($)
Dec. 31, 2010
Asarco LLC ("Asarco")
USD ($)
Dec. 31, 2012
Asarco LLC ("Asarco")
USD ($)
Dec. 31, 2011
Asarco LLC ("Asarco")
USD ($)
Dec. 31, 2010
Asarco LLC ("Asarco")
USD ($)
Dec. 31, 2010
Asarco LLC ("Asarco")
Cost of sales
USD ($)
Dec. 31, 2010
Asarco LLC ("Asarco")
Other income
USD ($)
Dec. 31, 2010
Asarco LLC ("Asarco")
Interest income
USD ($)
Dec. 31, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Dec. 31, 2011
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Dec. 31, 2010
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Dec. 31, 2012
Higher Technology S.A.C.
USD ($)
Dec. 31, 2011
Higher Technology S.A.C.
USD ($)
Dec. 31, 2010
Higher Technology S.A.C.
USD ($)
Dec. 31, 2012
Servicios y Fabricaciones Mecanicas S.A.C.
USD ($)
Dec. 31, 2011
Servicios y Fabricaciones Mecanicas S.A.C.
USD ($)
Dec. 31, 2010
Servicios y Fabricaciones Mecanicas S.A.C.
USD ($)
Dec. 31, 2012
Sempertrans France Belting Technology
USD ($)
Dec. 31, 2011
Sempertrans France Belting Technology
USD ($)
Dec. 31, 2010
Sempertrans France Belting Technology
USD ($)
Dec. 31, 2012
PIGOBA, S.A. de C.V.
USD ($)
Dec. 31, 2011
PIGOBA, S.A. de C.V.
USD ($)
Dec. 31, 2010
PIGOBA, S.A. de C.V.
USD ($)
Dec. 31, 2012
Breaker, S.A. de C.V
USD ($)
Dec. 31, 2011
Breaker, S.A. de C.V
USD ($)
Dec. 31, 2010
Breaker, S.A. de C.V
USD ($)
Mar. 31, 2012
MGE
Dec. 31, 2012
MGE
USD ($)
Dec. 31, 2005
MGE
item
May 31, 2010
MGE
USD ($)
Dec. 31, 2012
MGE
Line of credit
USD ($)
Dec. 31, 2011
MGE
Line of credit
USD ($)
Dec. 31, 2012
MGE
Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
USD ($)
Dec. 31, 2012
MGE
Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
MXN
Dec. 31, 2012
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
USD ($)
Dec. 31, 2011
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
USD ($)
Dec. 31, 2010
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
USD ($)
Dec. 31, 2012
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
Mexican subsidiaries
USD ($)
Dec. 31, 2011
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
Mexican subsidiaries
item
Dec. 31, 2011
Mexico Compania de Productos Automotrices, S.A. de C.V.
USD ($)
Dec. 31, 2010
Mexico Compania de Productos Automotrices, S.A. de C.V.
USD ($)
Dec. 31, 2012
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Dec. 31, 2011
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Dec. 31, 2010
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Dec. 31, 2012
Compania Perforadora Mexico S.A.P.I. de C.V and affiliates
USD ($)
Dec. 31, 2011
Compania Perforadora Mexico S.A.P.I. de C.V and affiliates
USD ($)
Dec. 31, 2010
Compania Perforadora Mexico S.A.P.I. de C.V and affiliates
USD ($)
Dec. 31, 2011
Consorcio Tricobre
USD ($)
Dec. 31, 2010
Consorcio Tricobre
USD ($)
Dec. 31, 2012
Consorcio Tricobre
Servicios de Ingenieria Consultec, S.A. de C. V.
Dec. 31, 2012
Mexico Generadora de Energia S.de R.L. ("MGE")
USD ($)
Dec. 31, 2010
Cadena Mexicana de Exhibicion S.A. de C.V.
USD ($)
Dec. 31, 2010
Fundacion Grupo Mexico
USD ($)
Dec. 31, 2011
Perforadora Mexico S.A. de C.V.
USD ($)
Dec. 31, 2010
Perforadora Mexico S.A. de C.V.
USD ($)
Dec. 31, 2011
CONSORCIO CESEL- CONSUTEC
USD ($)
Dec. 31, 2012
CONSORCIO CESEL- CONSUTEC
Servicios de Ingenieria Consultec, S.A. de C. V.
Dec. 31, 2011
Grupo Mexico Servicios S.A de C.V
Related party transactions                                                                                                                                
Related parties receivable current: $ 2,337,000 $ 1,988,000     $ 1,800,000 $ 700,000       $ 200,000           $ 1,000,000                                                                     $ 500,000 $ 100,000                        
Related parties receivable non-current: 183,950,000                                                                                                               184,000,000              
Related parties payable: 20,300,000 4,400,000       2,000,000     15,300,000           2,100,000 300,000   200,000 100,000                       200,000                   100,000 500,000           2,600,000 1,300,000                              
Total purchases from related parties 147,500,000 100,100,000 66,500,000   13,900,000 13,900,000 10,900,000   58,600,000 23,400,000 6,600,000       49,500,000 34,400,000 29,000,000 3,100,000 1,900,000 2,800,000 200,000 600,000 200,000 300,000 200,000 400,000 800,000 200,000 600,000 2,300,000 5,300,000 1,500,000                 2,700,000 2,800,000 3,000,000     200,000 2,300,000 13,900,000 11,600,000 3,500,000 2,200,000 1,800,000 200,000 500,000 5,300,000     200,000       3,300,000    
Donation to charitable organization                                                                                                                     800,000          
Amount recovered from previously written-off accounts receivable               7,700,000       5,000,000 1,600,000 1,100,000                                                                                                    
Number of power plants                                                                     2                                                          
Line of credit                                                                       350,000,000                                                        
Ownership percentage       0.001%                                                                     99.999% 99.999%                               42.70%             50.00% 99.97%
Value of interest acquired                                                                             150,000,000 1,928,600,000                                                
Loan repaid                                                                   150,000,000                                                            
Amount drawn                                                                         37,600,000 146,400,000                                                    
Number of loans guaranteed by subsidiaries                                                                                         3                                      
Average interest rate                                                                 4.18%                                                              
Original loan balance                                                                                       8,500,000                                        
Basis of variable interest rate                                                                                       Libor                                        
Spread on variable interest rate (as a percent)                                                                                       0.15%                                        
Remaining balance at December 31, 2012 4,213,900,000 2,745,700,000                                                                                   1,300,000                                        
Sales and other revenues from related parties $ 23,500,000 $ 68,800,000 $ 43,500,000           $ 23,500,000 $ 68,800,000 $ 43,500,000       $ 500,000 $ 500,000 $ 500,000                                               $ 900,000                                     $ 200,000 $ 200,000