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RELATED PARTY TRANSACTIONS: (Details) | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  | 12 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2013 Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates USD ($) | Dec. 31, 2012 Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates USD ($) | Sep. 30, 2012 Asarco LLC ("Asarco") USD ($) | Sep. 30, 2013 Asarco LLC ("Asarco") USD ($) | Sep. 30, 2012 Asarco LLC ("Asarco") USD ($) | Dec. 31, 2012 Asarco LLC ("Asarco") USD ($) | Sep. 30, 2013 Compania Perforadora Mexico S.A.P.I. de C.V. USD ($) | Dec. 31, 2012 Compania Perforadora Mexico S.A.P.I. de C.V. USD ($) | Sep. 30, 2013 Compania Minera Coimolache S.A. USD ($) | Sep. 30, 2012 Compania Minera Coimolache S.A. USD ($) | Sep. 30, 2013 Compania Minera Coimolache S.A. USD ($) | Sep. 30, 2012 Compania Minera Coimolache S.A. USD ($) | Dec. 31, 2012 Compania Minera Coimolache S.A. USD ($) | Sep. 30, 2013 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($) | Sep. 30, 2012 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($) | Sep. 30, 2013 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($) | Sep. 30, 2012 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($) | Dec. 31, 2012 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($) | Sep. 30, 2013 MGE USD ($) | Mar. 31, 2012 MGE USD ($) | Sep. 30, 2013 MGE USD ($) | Dec. 31, 2012 MGE USD ($) | Dec. 31, 2005 MGE item | May 31, 2010 MGE USD ($) | Dec. 31, 2012 MGE Line of credit USD ($) | Dec. 31, 2011 MGE Line of credit USD ($) | Mar. 31, 2012 MGE Controladora de Infraestructura Energetica Mexico, S. A. de C. V. USD ($) | Mar. 31, 2012 MGE Controladora de Infraestructura Energetica Mexico, S. A. de C. V. MXN | Sep. 30, 2013 Higher Technology S.A.C. USD ($) | Sep. 30, 2012 Higher Technology S.A.C. USD ($) | Dec. 31, 2012 Higher Technology S.A.C. USD ($) | Sep. 30, 2013 Servicios y Fabricaciones Mecanicas S.A.C. USD ($) | Sep. 30, 2012 Servicios y Fabricaciones Mecanicas S.A.C. USD ($) | Sep. 30, 2013 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($) | Dec. 31, 2012 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($) | Dec. 31, 2007 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") Mexican subsidiaries item | Sep. 30, 2013 Sempertrans USD ($) | Sep. 30, 2012 Sempertrans USD ($) | Sep. 30, 2013 Breaker, S.A. de C.V USD ($) | Sep. 30, 2012 Breaker, S.A. de C.V USD ($) | Sep. 30, 2013 PIGOBA, S.A. de C.V. USD ($) | Sep. 30, 2012 PIGOBA, S.A. de C.V. USD ($) | Sep. 30, 2013 Ferrocarril Mexicano, S.A. de C.V. USD ($) | Sep. 30, 2012 Ferrocarril Mexicano, S.A. de C.V. USD ($) | Dec. 31, 2012 Ferrocarril Mexicano, S.A. de C.V. USD ($) | Sep. 30, 2013 Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates USD ($) | Sep. 30, 2012 Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates USD ($) | Sep. 30, 2013 Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates USD ($) | Sep. 30, 2012 Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates USD ($) | Sep. 30, 2012 Mextransport USD ($) | Sep. 30, 2013 Mextransport USD ($) | Sep. 30, 2012 Mextransport USD ($) | Sep. 30, 2013 Grupo Mexico item | Sep. 30, 2013 Mexico Generadora de Energia S.de R.L. ("MGE") USD ($) | Sep. 30, 2013 Mexico Generadora de Energia S.de R.L. ("MGE") USD ($) | Mar. 31, 2012 Mexico Generadora de Energia S.de R.L. ("MGE") Minera Mexico Maximum | Sep. 30, 2013 Grupo Mexico Servicios S.A de C.V USD ($) | Sep. 30, 2012 Grupo Mexico Servicios S.A de C.V USD ($)
RELATED PARTY TRANSACTIONS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related parties receivables, current: | $ 30,434,000 |  | $ 30,434,000 |  | $ 25,740,000 | $ 800,000 | $ 1,800,000 |  |  |  |  | $ 900,000 | $ 500,000 | $ 20,500,000 |  | $ 20,500,000 |  | $ 23,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,200,000 | $ 8,200,000 |  |  |
Related parties receivable, non-current: | 161,244,000 |  | 161,244,000 |  | 183,950,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 161,200,000 |  | 161,200,000 | 184,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related parties payables: | 13,423,000 |  | 13,423,000 |  | 20,310,000 | 800,000 |  |  | 6,800,000 |  | 15,300,000 |  |  |  |  |  |  |  | 1,800,000 |  | 1,800,000 |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  | 100,000 |  | 200,000 |  |  | 300,000 | 100,000 |  |  |  | 200,000 |  |  |  | 3,400,000 |  | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchases from related parties |  |  | 155,600,000 | 100,400,000 |  |  |  |  | 82,000,000 | 33,000,000 |  |  |  |  |  |  |  |  |  |  | 36,500,000 | 37,200,000 |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 | 2,300,000 |  | 200,000 | 100,000 |  |  |  | 1,000,000 | 100,000 | 2,700,000 | 1,800,000 | 100,000 | 500,000 | 14,900,000 | 10,700,000 |  |  |  | 4,100,000 | 2,200,000 |  | 2,000,000 | 2,000,000 |  |  |  |  | 10,400,000 | 10,500,000
Number of subsidiaries involved in Mexican operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Number of power plants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.45% |  |  |  |  |  |  |  |  | 4.40% |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 44.20% |  | 44.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.999% | 99.999% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.001% |  |
Value of interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 | 1,928,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan repaid |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  | 18,400,000 |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,600,000 | 146,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans guaranteed by subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of variable interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months Libor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining balance at September 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,500,000 |  | 20,500,000 |  |  |  |  |  |  |  | 161,200,000 |  | 161,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest earned |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 500,000 | 800,000 | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,600,000 | 7,600,000 |  |  |
Sales and other revenues from related parties |  |  |  |  |  |  |  | 11,500,000 | 71,800,000 | 22,900,000 |  |  |  |  |  |  |  |  | 200,000 | 100,000 | 600,000 | 300,000 |  | 10,900,000 |  | 11,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 200,000 | 400,000 | 200,000 | 100,000 | 200,000 | 900,000 |  |  |  |  |  |
Sales and total other revenues from related parties | $ 11,200,000 | $ 11,900,000 | $ 84,600,000 | $ 24,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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