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RELATED PARTY TRANSACTIONS: (Details) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Grupo Mexico, S.A.B de C.V. and affiliates
Dec. 31, 2010
Grupo Mexico, S.A.B de C.V. and affiliates
Dec. 31, 2011
Asarco LLC
Dec. 31, 2010
Asarco LLC
Jun. 30, 2010
Asarco LLC
Cost of sales
Jun. 30, 2010
Asarco LLC
Other income
Jun. 30, 2010
Asarco LLC
Interest income
Dec. 31, 2011
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
Dec. 31, 2010
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
Dec. 31, 2009
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
Dec. 31, 2011
Higher Technology S.A.C.
Dec. 31, 2010
Higher Technology S.A.C.
Dec. 31, 2009
Higher Technology S.A.C.
Dec. 31, 2011
Breaker, S.A. de C.V
Dec. 31, 2010
Breaker, S.A. de C.V
Dec. 31, 2009
Breaker, S.A. de C.V
Dec. 31, 2011
Pigoba, S.A. de C.V
Dec. 31, 2010
Pigoba, S.A. de C.V
Dec. 31, 2009
Pigoba, S.A. de C.V
Dec. 31, 2011
Exploraciones Mineras del Peru S.A.C.
Dec. 31, 2011
Consorcio Tricobre
Dec. 31, 2010
Consorcio Tricobre
Dec. 31, 2011
Consorcio Tricobre
Servicios de Ingenieria Consultec, S.A. de C. V.
Dec. 31, 2011
Mexico transportes aereos S.A de C.V. ("Mextransport")
Dec. 31, 2010
Mexico transportes aereos S.A de C.V. ("Mextransport")
Dec. 31, 2009
Mexico transportes aereos S.A de C.V. ("Mextransport")
Dec. 31, 2011
Mexico transportes aereos S.A de C.V. ("Mextransport")
Mexican subsidiaries
loan
Dec. 31, 2007
Mexico transportes aereos S.A de C.V. ("Mextransport")
Mexican subsidiaries
loan
Dec. 31, 2011
Mexico Compania de Productos Automotrices, S.A. de C.V.
Dec. 31, 2010
Mexico Compania de Productos Automotrices, S.A. de C.V.
Dec. 31, 2009
Mexico Compania de Productos Automotrices, S.A. de C.V.
Dec. 31, 2011
Ferrocarril Mexicano, S.A. de C.V.
Dec. 31, 2010
Ferrocarril Mexicano, S.A. de C.V.
Dec. 31, 2009
Ferrocarril Mexicano, S.A. de C.V.
Dec. 31, 2011
Grupo Mexico S.A B. de C.V
Dec. 31, 2010
Grupo Mexico S.A B. de C.V
Dec. 31, 2009
Grupo Mexico S.A B. de C.V
Dec. 31, 2011
Compania Perforadora Mexico S.A.P.I.de C.V
Dec. 31, 2010
Compania Perforadora Mexico S.A.P.I.de C.V
Dec. 31, 2011
Exploraciones Mineras del Peru S.A.C.
Dec. 31, 2011
Exploraciones Mineras del Peru S.A.C.
Servicios de Ingenieria Consultec, S.A. de C. V.
Dec. 31, 2010
Cadena Mexicana de Exhibicion S.A. de C.V.
Dec. 31, 2009
Cadena Mexicana de Exhibicion S.A. de C.V.
Dec. 31, 2011
Servicios y Fabricaciones Mecanicas S.A.C.
Dec. 31, 2010
Servicios y Fabricaciones Mecanicas S.A.C.
Dec. 31, 2009
Servicios y Fabricaciones Mecanicas S.A.C.
Dec. 31, 2011
Sempertrans France Belting Technology
Dec. 31, 2010
Sempertrans France Belting Technology
Dec. 31, 2009
Sempertrans France Belting Technology
Dec. 31, 2010
Fundacion Grupo Mexico
Dec. 31, 2011
Perforadora Mexico S.A. de C.V.
Dec. 31, 2010
Perforadora Mexico S.A. de C.V.
Dec. 31, 2011
Grupo Mexico S.A. de C.V
Related party transactions                                                                                                                
Affiliate receivable $ 1,988,000 $ 32,700,000   $ 700,000 $ 32,700,000 $ 200,000         $ 1,000,000                                                           $ 100,000                              
Affiliate payable 4,392,000 4,665,000   2,000,000 2,300,000             900,000   100,000 100,000   200,000 300,000     100,000   300,000   500,000   500,000 400,000             1,300,000 100,000                                        
Total purchased from related parties 100,100,000 66,500,000 44,700,000     23,400,000 6,600,000       32,400,000 29,000,000 15,100,000 1,900,000 2,800,000 5,400,000 5,300,000 1,500,000 900,000 200,000 600,000 100,000 200,000 500,000 5,300,000   2,800,000 3,000,000 1,900,000     200,000 2,300,000 300,000 11,600,000 3,500,000 6,000,000 13,900,000 10,900,000 13,800,000 1,800,000 200,000 3,300,000   200,000 300,000 600,000 200,000 300,000 200,000 400,000 600,000        
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                                                                                            
Ownership of Consorcio Tricobre held by Servicios de Ingenieria Consutec, S.A. de C. V. (as a percent)                     0.03%                             42.70%                                   50.00%                       99.97%
Number of loans guaranteed by subsidiaries                                                             2                                                  
Number of loans repaid                                                           1                                                    
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, 2011 2,745,700,000 2,760,400,000                                                       2,600,000                                                    
Sales to related parties $ 68,800,000 $ 43,500,000       $ 68,800,000 $ 43,500,000       $ 500,000 $ 500,000                                                                                   $ 200,000 $ 200,000