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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 |
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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 |

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