RELATED PARTY TRANSACTIONS: (Tables)

12 Months Ended

Dec. 31, 2012

Receivable and payable balances with related parties are shown below (in millions):

	As of December 31,
	2012		2011
Related parties receivable current:
Grupo Mexico, S.A.B de C.V. and affiliates	$	1.8	$	0.7
Asarco LLC	—		0.2
Compania Perforadora Mexico S.A.P.I. de C.V.	0.5		0.1
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates	—		1.0
	$	2.3	$	2.0

Related parties receivable non-current:
Mexico Generadora de Energia S.de R.L. (“MGE”)	$	184.0	$	—

Related parties payable:
Grupo Mexico S.A.B. de C.V. and affiliates	$	—	$	2.0
Asarco LLC	15.3
Higher Technology S.A.C.	0.2		0.1
Breaker, S.A. de C.V	—		0.2
Mexico Transportes Aereos S.A. de C.V. (“Mextransport”)	0.1		0.5
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates	2.1		0.3
Ferrocarril Mexicano S.A. de C.V.	2.6		1.3
	$	20.3	$	4.4

The following table summarizes the purchase activity with related parties in 2012, 2011 and 2010 (in millions):

	2012		2011		2010
Grupo Mexico and affiliates:
Grupo Mexico S.A B. de C.V	$	13.9	$	13.9	$	10.9
Ferrocarril Mexicano, S.A de C.V.	13.9		11.6		3.5
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates	49.5		34.4		29.0
Compania Perforadora Mexico S.A.P.I. de C.V.	2.2		1.8		0.2
Consorcio Tricobre	—		0.5		5.3
Consorcio CESEL — CONSUTEC	—		3.3		—
Asarco LLC	58.6		23.4		6.6

Other Larrea family companies:
Mexico Compania de Productos Automotrices, S.A. de C.V.	—		0.2		2.3
Mextransport	2.7		2.8		3.0
Cadena Mexicana de Exhibicion S.A. de C.V.	—		—		0.2

Companies with relationships to SCC executive officers’ families:
Higher Technology S.A.C.	3.1		1.9		2.8
Servicios y Fabricaciones Mecanicas S.A.C.	0.2		0.6		0.2
Sempertrans France Belting Technology	0.3		0.2		0.4
PIGOBA, S.A. de C.V.	0.8		0.2		0.6
Breaker, S.A. de C.V.	2.3		5.3		1.5
Total purchased	$	147.5	$	100.1	$	66.5

Conditions and balance as of December 31, 2012 are as follows:

		Loan Open
Original loan balance (in millions)		$8.5
Maturity		August 2013
Interest rate		Libor + 0.15%
Remaining balance at December 31, 2012 (in millions)		$1.3

The following table summarizes the sales and other revenue activity with related parties in 2012 and 2011 (in millions).

	2012		2011		2010
Asarco	$	23.5	$	68.8	$	43.5
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates	0.5		0.5		0.5
Perforadora Mexico S.A. de C.V.	—		0.2		0.2
Mextransport	0.9		—		—
Total	$	24.9	$	69.5	$	44.2