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RELATED PARTY TRANSACTIONS: (Tables) | 3 Months Ended
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Mar. 31, 2012
RELATED PARTY TRANSACTIONS: |
Receivable and payable balances with affiliated companies |
|  | As of |
|  | March 31, 2012 |  | December 31, 2011 |
Affiliate receivable: |  |  |  |  |
Grupo Mexico S.A.B de C.V. and affiliates |  | $ | 0.8 |  | $ | 0.7 |
Asarco LLC. |  | — |  | 0.2 |
Compania Perforadora Mexico S.A.P.I. de C.V. |  | 0.2 |  | 0.1 |
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates |  | — |  | 1.0 |
|  | $ | 1.0 |  | $ | 2.0 |
Affiliate payable: |  |  |  |  |
Grupo Mexico S.A.B. de C.V. and affiliates |  | $ | 2.7 |  | $ | 2.0 |
Asarco LLC |  | 4.9 |  | — |
Higher Technology S.A.C. |  | — |  | 0.1 |
Breaker S.A. de C.V |  | 0.4 |  | 0.2 |
Exploraciones Mineras del Peru S.A.C. |  | 0.1 |  | 0.3 |
Mexico transportes aereos S.A. de C.V. (“Mextransport”) |  | 1.2 |  | 0.5 |
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates |  | 1.5 |  | — |
Ferrocarril Mexicano S.A. de C.V. |  | 1.2 |  | 1.3 |
|  | $ | 12.0 |  | $ | 4.4 |
Purchase activity with related parties |
|  | As of March 31, |
|  | 2012 |  | 2011 |
Grupo Mexico and affiliates: |  |  |  |  |
Grupo Mexico Servicios S.A de C.V |  | $ | 3.5 |  | $ | 3.5 |
Asarco LLC. |  | 5.6 |  | 7.7 |
Ferrocarril Mexicano S.A de C.V. |  | 4.1 |  | 0.5 |
Mexico Constructora Industrial S.A. de C.V. |  | 11.2 |  | 7.2 |
Cia Perforadora Mexico S.A.P.I. de C.V and affiliates |  | 0.1 |  | 0.1 |
Consortio Tricobre |  | — |  | 0.1 |
Other Larrea family companies: |  |  |  |  |
Mexico Compania de Productos Automotrices S.A. de C.V. |  | — |  | 0.1 |
Mexico Transportes Aereos S.A. de C.V. (“Mextransport”) |  | 0.7 |  | 0.7 |
Companies with relationships to SCC executive officers families: |  |  |  |  |
Higher Technology S.A.C. |  | 0.3 |  | 0.3 |
Servicios y Fabricaciones Mecanicas S.A.C. |  | — |  | 0.1 |
Sempertrans France Belting Technology |  | — |  | 0.2 |
PIGOBA S.A. de C.V. |  | — |  | 0.1 |
Breaker S.A. de C.V. |  | 0.5 |  | 1.1 |
Total purchases |  | $ | 26.0 |  | $ | 21.7 |
Conditions and balance of loan guarantee for related party |
|  | Loan Open |
Original loan balance (in millions) |  | $8.5 |
Maturity |  | August 2013 |
Interest rate |  | Libor + 0.15% |
Remaining balance at March 31, 2012 (in millions) |  | $1.9 |
Sales activity with related parties |
|  | As of March 31, |
|  | 2012 |  | 2011 |
Asarco |  | $ | 11.0 |  | $ | 17.9 |
Mexico Proyectos y Desarrollos, S.A. de C.V. |  | 0.1 |  | 0.1 |
Mextransport |  | 0.7 |  | — |
Total |  | $ | 11.8 |  | $ | 18.0 |

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