RELATED PARTY TRANSACTIONS: (Tables)

9 Months Ended

Sep. 30, 2012

Related party transactions

Receivable and payable balances with affiliated companies

	As of
	September 30, 2012		December 31, 2011
Affiliate receivable:
Grupo Mexico, S.A.B de C.V. (“Grupo Mexico”) and affiliates	$	0.8	$	0.7
Mexico Generadora de Energia S.A. de C.V.		178.2		156.3
Asarco LLC (“Asarco”)	—		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	0.5		1.0
	$	180.0	$	158.3
Affiliate payable:
Grupo Mexico and affiliates	$	1.5	$	2.0
Asarco	6.0		—
Higher Technology S.A.C.	0.2		0.1
Breaker S.A. de C.V	0.1		0.2
Exploraciones Mineras del Peru S.A.C.			0.3
Mexico Transportes Aereos, S.A. de C.V. (“Mextransport”)	0.2		0.5
Ferrocarril Mexicano, S.A. de C.V.	2.1		1.3
	$	10.1	$	4.4

Purchase activity with related parties

	Nine months endedSeptember 30,
	2012		2011
Grupo Mexico and affiliates:
Grupo Mexico	$	10.5	$	10.4
Asarco	33.0		17.2
Ferrocarril Mexicano, S.A de C.V.	10.7		8.9
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates	2.2		0.5
Consorcio Tricobre	—		0.5
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates	37.2		23.7
Other Larrea family companies:
Mexico Compania de Productos Automotrices, S.A. de C.V.	—		0.2
Mextransport	2.0		1.9
Companies with relationships to SCC executive officers families:
Higher Technology S.A.C.	2.3		1.6
Servicios y Fabricaciones Mecanicas S.A.C.	0.1		0.5
Sempertrans France Belting Technology	0.1		0.2
PIGOBA, S.A. de C.V.	0.5		0.2
Breaker, S.A. de C.V.	1.8		4.4
Total purchased	$	100.4	$	70.2

Sales and other revenue activity with related parties

	3 Months EndedSeptember 30,				9 Months EndedSeptember 30,
	2012		2011		2012		2011
Asarco	$	11.5	$	16.3	$	22.9	$	68.8
Mexico Proyectos y Desarrollos, S.A. de C.V.	0.1		0.1		0.3		0.4
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates	0.2		(*)		0.2		0.1
Mextransport	0.1		—		0.9		—
Total	$	11.9	$	16.4	$	24.3	$	69.3

(*) amount is lower than $0.1 million

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

Related party transactions

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 September 30, 2012 (in millions)	$	1.3

Mexico Generadora de Energia S.A de C.V

Related party transactions

Conditions and balance of loan guarantee for related party

	Loan Open
Line of credit	$	350.0
Maturity	December 31, 2012
Average interest rate	4.18		%
Remaining balance at September 30, 2012	$	178.2