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RELATED PARTY TRANSACTIONS: (Details) MXN in Millions, $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 04, 2014 item	May 31, 2010 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2012 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2012 item MW	Dec. 31, 2005 item	Dec. 31, 2016 USD ($)	Mar. 31, 2012 MXN	Mar. 31, 2012 USD ($)
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			$ 74.0		$ 74.0				$ 23.4
Related parties payable:			98.6		98.6				62.2
Asarco LLC
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			47.6		47.6				5.5
Related parties payable:			40.6		40.6				36.3
Total purchases					19.6	$ 14.8
Total sales					82.1	34.6
Boutique Bowling de Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.1		0.1				0.1
Related parties payable:			0.3		0.3				0.2
Total purchases					0.1	0.2
Total sales					0.1	0.1
Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			1.5		1.5				1.3
Total sales					0.2	0.4
Grupo Mexico
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			4.8		4.8				4.5
Related parties payable:			2.6		2.6				0.1
Total purchases					6.9	6.9
Total sales					0.2	0.3
Donations			1.4
Mexico Generadora de Energia S. de R.L. ("MGE")
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			18.5		18.5				10.2
Related parties payable:			43.0		43.0				13.9
Total purchases					118.9	108.7
Total sales					49.4	50.1
Maximum amount of line of credit granted to related party		$ 350.0
Interest rate (as a percent)		4.40%
Loan repaid				$ 150.0
Interest earned						3.1
Mexico Generadora de Energia S. de R.L. ("MGE") | Mexico
RELATED PARTY TRANSACTIONS:
Number of power plants | item							2	2
Net total capacity (in megawatts) | MW							516.2
Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
RELATED PARTY TRANSACTIONS:
Percentage of interest acquired										99.999%	99.999%
Value of interest acquired										MXN 1,928.6	$ 150.0
Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V. | Mexico
RELATED PARTY TRANSACTIONS:
Percentage of interest acquired							99.999%
Mexico Generadora de Energia S. de R.L. ("MGE") | Minera Mexico | Maximum
RELATED PARTY TRANSACTIONS:
Ownership percentage										0.001%	0.001%
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			1.2		1.2				1.5
Related parties payable:			7.7		7.7				7.8
Total purchases					72.3	42.8
Total sales						0.3
Operadora de Cinemas S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:			0.3		0.3				0.2
Related parties payable:			0.5		0.5				0.4
Total purchases					0.1	0.3
Total sales					0.1
Operadora de Generadoras de Energia Mexico S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties receivable current:									0.1
Eolica El Retiro, S.A.P.I. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			0.7		0.7				0.1
Total purchases					2.0	1.0
Number of wind turbines | item	37
Percentage of supply to third-party energy users	28.00%
Ferrocarril Mexicano, S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Related parties payable:			3.1		3.1				3.0
Total purchases					23.5	21.0
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
RELATED PARTY TRANSACTIONS:
Related parties payable:			$ 0.1		0.1				0.1
Total purchases					0.4	1.0
Total sales						0.2
Higher Technology S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases						0.6
Pigoba S.A. de C.V.
RELATED PARTY TRANSACTIONS:
Total purchases						0.1
Servicios y Fabricaciones Mecanicas S.A.C.
RELATED PARTY TRANSACTIONS:
Total purchases					0.2	0.2
Breaker, S.A. de C.V and affiliates ("Breaker")
RELATED PARTY TRANSACTIONS:
Related parties payable:									$ 0.3
Total purchases						0.4
Breaker, S.A. de C.V and affiliates ("Breaker") | Maximum
RELATED PARTY TRANSACTIONS:
Total purchases					$ 0.1
Equity investment in affiliate
RELATED PARTY TRANSACTIONS:
Ownership percentage			44.20%		44.20%
Grupo Mexico and affiliates
RELATED PARTY TRANSACTIONS:
Total purchases					$ 243.2	195.2
Total sales					131.9	85.7
Companies with relationship to SCC executive officers
RELATED PARTY TRANSACTIONS:
Total purchases					0.2	1.3
Companies with relationship to the controlling group
RELATED PARTY TRANSACTIONS:
Total purchases					0.6	1.5
Total sales					$ 0.2	$ 0.3

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