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RELATED PARTY TRANSACTIONS: (Tables)

6 Months Ended

Jun. 30, 2012

RELATED PARTY TRANSACTIONS:

Receivable and payable balances with affiliated companies

		As of
		June 30, 2012			December 31, 2011
Affiliate receivable:
Grupo Mexico, S.A.B de C.V. (“Grupo Mexico”) and affiliates		$	0.8		$	0.7
Asarco LLC (“Asarco”)		—			0.2
Compania Perforadora Mexico, S.A.P.I. de C.V.		0.3			0.1
Mexico Proyectos y Desarrollos, S.A de C.V. and affiliates		1.3			1.0
		$	2.4		$	2.0
Affiliate payable:
Grupo Mexico and affiliates		$	4.5		$	2.0
Asarco		1.0			—
Higher Technology S.A.C.		0.5			0.1
Breaker S.A. de C.V		0.2			0.2
Exploraciones Mineras del Peru S.A.C.		—			0.3
Mexico Transportes Aereos, S.A. de C.V. (“Mextransport”)		0.4			0.5
Ferrocarril Mexicano, S.A. de C.V.		1.0			1.3
		$	7.6		$	4.4

Purchase activity with related parties

		Six months ended June 30,
		2012			2011
Grupo Mexico and affiliates:
Grupo Mexico Servicios, S.A de C.V		$	6.9		$	7.0
Asarco		16.4			7.7
Ferrocarril Mexicano, S.A de C.V.		7.4			4.1
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates		1.1			0.4
Consorcio Tricobre		—			0.5
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates		24.8			15.9

Other Larrea family companies:
Mexico Compania de Productos Automotrices, S.A. de C.V.		—			0.2
Mextransport		1.5			1.3

Companies with relationships to SCC executive officers families:
Higher Technology S.A.C.		1.5			0.9
Servicios y Fabricaciones Mecanicas S.A.C.		0.1			0.2
Sempertrans France Belting Technology		—			0.2
PIGOBA, S.A. de C.V.		0.1			0.1
Breaker, S.A. de C.V.		1.2			2.9
Total purchased		$	61.0		$	41.4

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 June 30, 2012 (in millions)		$1.9

Sales and other revenue activity with related parties

		3 Months Ended June 30,						6 Months Ended June 30,
		2012			2011			2012			2011

Asarco		$	0.4		$	34.6		$	11.4		$	52.5
Mexico Proyectos y Desarrollos, S.A. de C.V.		0.1			—			0.2			—
Mextransport		0.1			—			0.8			—
Total		$	0.6		$	34.6		$	12.4		$	52.5