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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 |
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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 |

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