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RELATED PARTY TRANSACTIONS: (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |  |  | 6 Months Ended |  | 3 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 |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010 | Jun. 30, 2011 Grupo Mexico, S.A.B de C.V. and affiliates | Dec. 31, 2010 Grupo Mexico, S.A.B de C.V. and affiliates | Jun. 30, 2011 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates | Jun. 30, 2010 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 | Jun. 30, 2011 Asarco LLC | Mar. 31, 2011 Asarco LLC | Jun. 30, 2010 Asarco LLC | Jun. 30, 2011 Asarco LLC | Jun. 30, 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 | Jun. 30, 2011 Ferrocarril Mexicano, S.A. de C.V. | Jun. 30, 2010 Ferrocarril Mexicano, S.A. de C.V. | Dec. 31, 2010 Ferrocarril Mexicano, S.A. de C.V. | Jun. 30, 2011 Mexico Transportes Aereos S.A de C.V. ("Mextransport") | Jun. 30, 2010 Mexico Transportes Aereos S.A de C.V. ("Mextransport") | Dec. 31, 2010 Mexico Transportes Aereos S.A de C.V. ("Mextransport") | Dec. 31, 2007 Mexico Transportes Aereos S.A de C.V. ("Mextransport") Mexican subsidiaries | Jun. 30, 2011 Mexico Compania de Productos Automotrices, S.A. de C.V. | Jun. 30, 2010 Mexico Compania de Productos Automotrices, S.A. de C.V. | Jun. 30, 2011 Consorcio Tricobre | Jun. 30, 2010 Consorcio Tricobre | Dec. 31, 2010 Consorcio Tricobre | Jun. 30, 2011 Consorcio Tricobre Servicios de Ingenieria Consultec, S.A. de C. V. | Jun. 30, 2011 Higher Technology S.A.C. | Jun. 30, 2010 Higher Technology S.A.C. | Dec. 31, 2010 Higher Technology S.A.C. | Jun. 30, 2011 Breaker, S.A. de C.V | Jun. 30, 2010 Breaker, S.A. de C.V | Dec. 31, 2010 Breaker, S.A. de C.V | Jun. 30, 2011 Pigoba, S.A. de C.V | Jun. 30, 2010 Pigoba, S.A. de C.V | Dec. 31, 2010 Pigoba, S.A. de C.V | Jun. 30, 2011 Grupo Mexico Servicios, S.A de C.V | Jun. 30, 2010 Grupo Mexico Servicios, S.A de C.V | Jun. 30, 2011 Mexico Constructora Industrial S.A. de C.V | Jun. 30, 2011 Cia Perforadora Mexico S.A.P.I. de C.V and affiliates | Jun. 30, 2011 Servicios y Fabricaciones Mecanicas S.A.C. | Jun. 30, 2010 Servicios y Fabricaciones Mecanicas S.A.C. | Jun. 30, 2011 Sempertrans France Belting Technology | Jun. 30, 2010 Sempertrans France Belting Technology
Related party transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining balance at June 30, 2010 | $ 2,750.4 |  | $ 2,760.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount recovered from previously written-off accounts receivable |  |  |  |  |  |  |  |  |  |  | 7.7 |  |  | 5.0 | 1.6 | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales to related parties |  |  |  |  |  |  |  |  | 34.6 | 17.9 | 5.1 | 52.5 | 5.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate receivable | 4.4 |  | 32.7 | 0.8 | 32.7 | 3.3 |  |  | 0.3 |  |  | 0.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate payable | 5.6 |  | 4.7 | 2.6 | 2.3 |  |  | 0.9 |  |  |  |  |  |  |  |  | 1.3 |  | 0.1 | 0.5 |  | 0.4 |  | 0.3 |  |  |  | 0.5 |  |  |  | 0.1 | 0.9 |  | 0.3 |  |  | 0.1 |  |  |  |  |  |  |  |
Total purchased from related parties | 41.4 | 23.3 |  |  |  | 1.8 | 8.8 |  |  |  |  | 7.7 |  |  |  |  | 4.1 | 1.6 |  | 1.3 | 1.0 |  |  | 0.2 | 1.1 | 0.5 | 1.4 |  |  | 0.9 | 1.5 |  | 2.9 | 0.3 |  | 0.1 | 0.1 |  | 7.0 | 6.9 | 14.1 | 0.4 | 0.2 | 0.2 | 0.2 | 0.4
Ownership of Consorcio Tricobre held by Servicios de Ingenieria Consutec, S.A. de C. V. (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans guaranteed by subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original loan balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of variable interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Libor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans repaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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