RELATED PARTY TRANSACTIONS: (Tables)

3 Months Ended

Mar. 31, 2013

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

	As of
	March 31, 2013		December 31, 2012
Related parties receivable current:
Grupo Mexico S.A.B de C.V. and affiliates	$	0.8	$	1.8
Asarco LLC.	9.2		—
Compania Perforadora Mexico S.A.P.I. de C.V.	0.6		0.5
Compania Minera Coimolache S.A.	23.4		23.4
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates	0.2		—
	$	34.2	$	25.7

Related parties receivable non-current:
Mexico Generadora de Energia S.de R.L. (“MGE”)	$	173.4	$	184.0

Related parties payable:
Grupo Mexico S.A.B. de C.V. and affiliates	$	0.7	$	—
Asarco LLC	—		15.3
Higher Technology S.A.C.	0.1		0.2
Breaker, S.A. de C.V	0.3		—
Mexico Transportes Aereos S.A. de C.V. (“Mextransport”)	0.4		0.1
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates	—		2.1
Ferrocarril Mexicano S.A. de C.V.	2.6		2.6
	$	4.1	$	20.3

The following table summarizes the purchase activity with related parties in the three months ended March 31, 2013 and 2012 (in millions):

	As of March 31,
	2013		2012
Grupo Mexico and affiliates:
Grupo Mexico Servicios S.A de C.V	$	3.5	$	3.5
Asarco LLC.	32.9		5.6
Ferrocarril Mexicano S.A de C.V.	5.8		4.1
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates	9.3		11.2
Cia Perforadora Mexico S.A.P.I. de C.V and affiliates	0.6		0.1

Other Larrea family companies:
Mextransport	0.6		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	0.1		—
Breaker S.A. de C.V.	0.8		0.5
Total purchases	$	54.0	$	26.0

The following table summarizes the sales and other revenue activity with related parties in the first quarter of 2013 and 2012 (in millions):

	As of March 31,
	2013		2012
Asarco	$	36.6	$	11.0
Mexico Proyectos y Desarrollos, S.A. de C.V.	0.2		0.1
Cia Perforadora Mexico S.A.P.I. de C.V and affiliates	0.1		—
MGE	0.1
Mextransport	0.1		0.7
Total	$	37.1	$	11.8

Mexico Transportes Aereos S.A. de C.V. ("Mextransport")

	Loan
Original loan balance (in millions)	$	8.5
Maturity	August 2013
Interest rate	Libor + 0.15		%
Remaining balance at March 31, 2013 (in millions)	$	0.6

Compania Minera Coimolache S.A.

Conditions and balance of the loan as of March 31, 2013 are as follows (in millions):

	Loan
Total loan granted	$	56.6
Interest rate	6 months Libor + 3% (approximately 3.45		)%
Remaining balance at March 31, 2013	$	23.4
Interest earned in the first quarter 2013	$	0.4
Interest earned in the first quarter 2012	$	0.5