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RELATED PARTY TRANSACTIONS: (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
Item
Dec. 31, 2011
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
Jun. 30, 2012
Asarco LLC ("Asarco")
Jun. 30, 2011
Asarco LLC ("Asarco")
Jun. 30, 2012
Asarco LLC ("Asarco")
Jun. 30, 2011
Asarco LLC ("Asarco")
Dec. 31, 2011
Asarco LLC ("Asarco")
Jun. 30, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
Jun. 30, 2011
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
Jun. 30, 2012
Higher Technology S.A.C.
Jun. 30, 2011
Higher Technology S.A.C.
Dec. 31, 2011
Higher Technology S.A.C.
Jun. 30, 2012
Servicios y Fabricaciones Mecanicas S.A.C.
Jun. 30, 2011
Servicios y Fabricaciones Mecanicas S.A.C.
Jun. 30, 2011
Sempertrans France Belting Technology
Jun. 30, 2012
PIGOBA, S.A. de C.V.
Jun. 30, 2011
PIGOBA, S.A. de C.V.
Jun. 30, 2012
Breaker, S.A. de C.V
Jun. 30, 2011
Breaker, S.A. de C.V
Dec. 31, 2011
Breaker, S.A. de C.V
Dec. 31, 2011
Exploraciones Mineras del Peru S.A.C.
Jun. 30, 2012
Mexico Transportes Aereos S.A de C.V. ("Mextransport")
Jun. 30, 2012
Mexico Transportes Aereos S.A de C.V. ("Mextransport")
Jun. 30, 2011
Mexico Transportes Aereos S.A de C.V. ("Mextransport")
Dec. 31, 2011
Mexico Transportes Aereos S.A de C.V. ("Mextransport")
Jun. 30, 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
Jun. 30, 2011
Mexico Compania de Productos Automotrices, S.A. de C.V.
Jun. 30, 2012
Ferrocarril Mexicano, S.A. de C.V.
Jun. 30, 2011
Ferrocarril Mexicano, S.A. de C.V.
Dec. 31, 2011
Ferrocarril Mexicano, S.A. de C.V.
Jun. 30, 2012
Grupo Mexico Servicios S.A de C.V
Jun. 30, 2011
Grupo Mexico Servicios S.A de C.V
Jun. 30, 2012
Compania Perforadora Mexico S.A.P.I. de C.V and affiliates
Jun. 30, 2011
Compania Perforadora Mexico S.A.P.I. de C.V and affiliates
Dec. 31, 2011
Compania Perforadora Mexico S.A.P.I. de C.V and affiliates
Jun. 30, 2011
Consorcio Tricobre
Jun. 30, 2012
Exploraciones Mineras del Peru S.A.C. / Grupo Mexico Servicios de Ingenieria S.A. de C.V.
Jun. 30, 2012
Exploraciones Mineras del Peru S.A.C. / Mexico Proyectos y Desarrollos, S.A. de C.V.
Jun. 30, 2012
Exploraciones Mineras del Peru S.A.C. / Mexico Proyectos y Desarrollos, S.A. de C.V.
Related party transactions                                                                                            
Affiliate receivable $ 2,455,000   $ 2,455,000   $ 1,988,000 $ 800,000 $ 700,000         $ 200,000 $ 1,300,000   $ 1,000,000                                                 $ 300,000   $ 100,000        
Affiliate payable 7,600,000   7,600,000   4,400,000 4,500,000 2,000,000 1,000,000   1,000,000           500,000   100,000           200,000   200,000 300,000 400,000 400,000   500,000       1,000,000   1,300,000                  
Total purchases from related parties     61,000,000 41,400,000           16,400,000 7,700,000   24,800,000 15,900,000   1,500,000 900,000   100,000 200,000 200,000 100,000 100,000 1,200,000 2,900,000       1,500,000 1,300,000       200,000 7,400,000 4,100,000   6,900,000 7,000,000 1,100,000 400,000   500,000      
Number of subsidiaries involved in Mexican operations           3                                                                                
Ownership percentage                                                                                       99.97% 0.03% 0.03%
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 June 30, 2012 2,741,000,000   2,741,000,000   2,745,700,000                                                     1,900,000                            
Sales and other revenues from related parties $ 600,000 $ 34,600,000 $ 12,400,000 $ 52,500,000       $ 400,000 $ 34,600,000 $ 11,400,000 $ 52,500,000                                 $ 100,000 $ 800,000                               $ 100,000 $ 200,000