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RELATED PARTY TRANSACTIONS: (Tables)

3 Months Ended

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