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RELATED PARTY TRANSACTIONS: (Details) | 12 Months Ended |  | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |
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Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 Minera Mexico | Dec. 31, 2012 Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates USD ($) | Dec. 31, 2011 Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates USD ($) | Dec. 31, 2010 Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates USD ($) | Dec. 31, 2010 Asarco LLC ("Asarco") USD ($) | Dec. 31, 2012 Asarco LLC ("Asarco") USD ($) | Dec. 31, 2011 Asarco LLC ("Asarco") USD ($) | Dec. 31, 2010 Asarco LLC ("Asarco") USD ($) | Dec. 31, 2010 Asarco LLC ("Asarco") Cost of sales USD ($) | Dec. 31, 2010 Asarco LLC ("Asarco") Other income USD ($) | Dec. 31, 2010 Asarco LLC ("Asarco") Interest income USD ($) | Dec. 31, 2012 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($) | Dec. 31, 2011 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($) | Dec. 31, 2010 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($) | Dec. 31, 2012 Higher Technology S.A.C. USD ($) | Dec. 31, 2011 Higher Technology S.A.C. USD ($) | Dec. 31, 2010 Higher Technology S.A.C. USD ($) | Dec. 31, 2012 Servicios y Fabricaciones Mecanicas S.A.C. USD ($) | Dec. 31, 2011 Servicios y Fabricaciones Mecanicas S.A.C. USD ($) | Dec. 31, 2010 Servicios y Fabricaciones Mecanicas S.A.C. USD ($) | Dec. 31, 2012 Sempertrans France Belting Technology USD ($) | Dec. 31, 2011 Sempertrans France Belting Technology USD ($) | Dec. 31, 2010 Sempertrans France Belting Technology USD ($) | Dec. 31, 2012 PIGOBA, S.A. de C.V. USD ($) | Dec. 31, 2011 PIGOBA, S.A. de C.V. USD ($) | Dec. 31, 2010 PIGOBA, S.A. de C.V. USD ($) | Dec. 31, 2012 Breaker, S.A. de C.V USD ($) | Dec. 31, 2011 Breaker, S.A. de C.V USD ($) | Dec. 31, 2010 Breaker, S.A. de C.V USD ($) | Mar. 31, 2012 MGE | Dec. 31, 2012 MGE USD ($) | Dec. 31, 2005 MGE item | May 31, 2010 MGE USD ($) | Dec. 31, 2012 MGE Line of credit USD ($) | Dec. 31, 2011 MGE Line of credit USD ($) | Dec. 31, 2012 MGE Controladora de Infraestructura Energetica Mexico, S. A. de C. V. USD ($) | Dec. 31, 2012 MGE Controladora de Infraestructura Energetica Mexico, S. A. de C. V. MXN | Dec. 31, 2012 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($) | Dec. 31, 2011 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($) | Dec. 31, 2010 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($) | Dec. 31, 2012 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") Mexican subsidiaries USD ($) | Dec. 31, 2011 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") Mexican subsidiaries item | Dec. 31, 2011 Mexico Compania de Productos Automotrices, S.A. de C.V. USD ($) | Dec. 31, 2010 Mexico Compania de Productos Automotrices, S.A. de C.V. USD ($) | Dec. 31, 2012 Ferrocarril Mexicano, S.A. de C.V. USD ($) | Dec. 31, 2011 Ferrocarril Mexicano, S.A. de C.V. USD ($) | Dec. 31, 2010 Ferrocarril Mexicano, S.A. de C.V. USD ($) | Dec. 31, 2012 Compania Perforadora Mexico S.A.P.I. de C.V and affiliates USD ($) | Dec. 31, 2011 Compania Perforadora Mexico S.A.P.I. de C.V and affiliates USD ($) | Dec. 31, 2010 Compania Perforadora Mexico S.A.P.I. de C.V and affiliates USD ($) | Dec. 31, 2011 Consorcio Tricobre USD ($) | Dec. 31, 2010 Consorcio Tricobre USD ($) | Dec. 31, 2012 Consorcio Tricobre Servicios de Ingenieria Consultec, S.A. de C. V. | Dec. 31, 2012 Mexico Generadora de Energia S.de R.L. ("MGE") USD ($) | Dec. 31, 2010 Cadena Mexicana de Exhibicion S.A. de C.V. USD ($) | Dec. 31, 2010 Fundacion Grupo Mexico USD ($) | Dec. 31, 2011 Perforadora Mexico S.A. de C.V. USD ($) | Dec. 31, 2010 Perforadora Mexico S.A. de C.V. USD ($) | Dec. 31, 2011 CONSORCIO CESEL- CONSUTEC USD ($) | Dec. 31, 2012 CONSORCIO CESEL- CONSUTEC Servicios de Ingenieria Consultec, S.A. de C. V. | Dec. 31, 2011 Grupo Mexico Servicios S.A de C.V
Related party transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related parties receivable current: | $ 2,337,000 | $ 1,988,000 |  |  | $ 1,800,000 | $ 700,000 |  |  |  | $ 200,000 |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Related parties receivable non-current: | 183,950,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 184,000,000 |  |  |  |  |  |  |
Related parties payable: | 20,300,000 | 4,400,000 |  |  |  | 2,000,000 |  |  | 15,300,000 |  |  |  |  |  | 2,100,000 | 300,000 |  | 200,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  | 100,000 | 500,000 |  |  |  |  |  | 2,600,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchases from related parties | 147,500,000 | 100,100,000 | 66,500,000 |  | 13,900,000 | 13,900,000 | 10,900,000 |  | 58,600,000 | 23,400,000 | 6,600,000 |  |  |  | 49,500,000 | 34,400,000 | 29,000,000 | 3,100,000 | 1,900,000 | 2,800,000 | 200,000 | 600,000 | 200,000 | 300,000 | 200,000 | 400,000 | 800,000 | 200,000 | 600,000 | 2,300,000 | 5,300,000 | 1,500,000 |  |  |  |  |  |  |  |  | 2,700,000 | 2,800,000 | 3,000,000 |  |  | 200,000 | 2,300,000 | 13,900,000 | 11,600,000 | 3,500,000 | 2,200,000 | 1,800,000 | 200,000 | 500,000 | 5,300,000 |  |  | 200,000 |  |  |  | 3,300,000 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power plants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 0.001% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.999% | 99.999% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.70% |  |  |  |  |  |  | 50.00% | 99.97%
Value of interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 | 1,928,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan repaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount drawn |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,600,000 | 146,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans guaranteed by subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.18% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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, 2012 | 4,213,900,000 | 2,745,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and other revenues from related parties | $ 23,500,000 | $ 68,800,000 | $ 43,500,000 |  |  |  |  |  | $ 23,500,000 | $ 68,800,000 | $ 43,500,000 |  |  |  | $ 500,000 | $ 500,000 | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 200,000 |  |  |

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