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RELATED PARTY TRANSACTIONS: (Details) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Mar. 31, 2012
Grupo Mexico, S.A.B de C.V. and affiliates
Dec. 31, 2011
Grupo Mexico, S.A.B de C.V. and affiliates
Mar. 31, 2012
Asarco LLC
Mar. 31, 2011
Asarco LLC
Dec. 31, 2011
Asarco LLC
Mar. 31, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
Dec. 31, 2011
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
Mar. 31, 2012
Higher Technology S.A.C.
Mar. 31, 2011
Higher Technology S.A.C.
Dec. 31, 2011
Higher Technology S.A.C.
Mar. 31, 2012
Breaker, S.A. de C.V
Mar. 31, 2011
Breaker, S.A. de C.V
Dec. 31, 2011
Breaker, S.A. de C.V
Mar. 31, 2011
Pigoba, S.A. de C.V
Mar. 31, 2012
Exploraciones Mineras del Peru S.A.C.
Dec. 31, 2011
Exploraciones Mineras del Peru S.A.C.
Mar. 31, 2012
Mexico transportes aereos S.A de C.V. ("Mextransport")
Mar. 31, 2011
Mexico transportes aereos S.A de C.V. ("Mextransport")
Dec. 31, 2011
Mexico transportes aereos S.A de C.V. ("Mextransport")
Mar. 31, 2012
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
Mar. 31, 2011
Mexico Compania de Productos Automotrices, S.A. de C.V.
Mar. 31, 2012
Ferrocarril Mexicano, S.A. de C.V.
Mar. 31, 2011
Ferrocarril Mexicano, S.A. de C.V.
Dec. 31, 2011
Ferrocarril Mexicano, S.A. de C.V.
Mar. 31, 2012
Grupo Mexico Servicios S.A de C.V
Mar. 31, 2011
Grupo Mexico Servicios S.A de C.V
Mar. 31, 2012
Cia Perforadora Mexico S.A.P.I. de C.V and affiliates
Mar. 31, 2011
Cia Perforadora Mexico S.A.P.I. de C.V and affiliates
Dec. 31, 2011
Cia Perforadora Mexico S.A.P.I. de C.V and affiliates
Mar. 31, 2011
Consortio Tricobre
Mar. 31, 2012
CONSORCIO CESEL- CONSUTEC
Servicios de Ingenieria Consultec, S.A. de C. V.
Mar. 31, 2011
Servicios y Fabricaciones Mecanicas S.A.C.
Mar. 31, 2011
Sempertrans France Belting Technology
Mar. 31, 2012
Exploraciones Mineras del Peru S.A.C. / Grupo Mexico Servicios de Ingenieria S.A. de C.V.
Mar. 31, 2012
Mexico Constructora Industrial S.A. de C.V
Mar. 31, 2011
Mexico Constructora Industrial S.A. de C.V
Mar. 31, 2012
Exploraciones Mineras del Peru S.A.C. / Mexico Proyectos y Desarrollos, S.A. de C.V.
Mar. 31, 2011
Exploraciones Mineras del Peru S.A.C. / Mexico Proyectos y Desarrollos, S.A. de C.V.
Mar. 31, 2012
Consorcio Tricobre
Servicios de Ingenieria Consultec, S.A. de C. V.
Related party transactions                                                                                      
Affiliate receivable $ 1,024,000   $ 1,988,000 $ 800,000 $ 700,000     $ 200,000   $ 1,000,000                                         $ 200,000   $ 100,000                    
Affiliate payable 12,000,000   4,400,000 2,700,000 2,000,000 4,900,000     1,500,000       100,000 400,000   200,000   100,000 300,000 1,200,000   500,000       1,200,000   1,300,000                              
Total purchases from related parties 26,000,000 21,700,000       5,600,000 7,700,000       300,000 300,000   500,000 1,100,000   100,000     700,000 700,000       100,000 4,100,000 500,000   3,500,000 3,500,000 100,000 100,000   100,000   100,000 200,000   11,200,000 7,200,000      
Ownership percentage                                                                     50.00%     99.97%     0.03%   42.70%
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 2,745,900,000   2,745,700,000                                       1,900,000                                        
Sales to related parties $ 10,972,000 $ 17,885,000       $ 11,000,000 $ 17,900,000                         $ 700,000                                         $ 100,000 $ 100,000