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RELATED PARTY TRANSACTIONS: (Details)			9 Months Ended			1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended						9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended			9 Months Ended					9 Months Ended
	Sep. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2014 Grupo Mexico S.A. de C.V. USD ($)	Sep. 30, 2013 Grupo Mexico S.A. de C.V. USD ($)	Dec. 31, 2013 Grupo Mexico S.A. de C.V. USD ($)	May 31, 2010 Mexico Generadora de Energia S. de R.L. ("MGE") USD ($)	Mar. 31, 2012 Mexico Generadora de Energia S. de R.L. ("MGE") USD ($)	Sep. 30, 2014 Mexico Generadora de Energia S. de R.L. ("MGE") USD ($)	Sep. 30, 2013 Mexico Generadora de Energia S. de R.L. ("MGE") USD ($)	Dec. 31, 2012 Mexico Generadora de Energia S. de R.L. ("MGE") USD ($)	Dec. 31, 2005 Mexico Generadora de Energia S. de R.L. ("MGE") item	Dec. 31, 2013 Mexico Generadora de Energia S. de R.L. ("MGE") USD ($)	Mar. 31, 2012 Mexico Generadora de Energia S. de R.L. ("MGE") Controladora de Infraestructura Energetica Mexico, S. A. de C. V. USD ($)	Mar. 31, 2012 Mexico Generadora de Energia S. de R.L. ("MGE") Controladora de Infraestructura Energetica Mexico, S. A. de C. V. MXN	Mar. 31, 2012 Mexico Generadora de Energia S. de R.L. ("MGE") Minera Mexico Maximum	Sep. 30, 2014 Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates USD ($)	Sep. 30, 2013 Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates USD ($)	Dec. 31, 2013 Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates USD ($)	Sep. 30, 2014 Equity investment in affiliate USD ($)	Sep. 30, 2013 Equity investment in affiliate USD ($)	Dec. 31, 2013 Equity investment in affiliate USD ($)	Sep. 30, 2014 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Sep. 30, 2013 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Dec. 31, 2013 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Sep. 30, 2014 Asarco LLC ("Asarco") USD ($)	Sep. 30, 2013 Asarco LLC ("Asarco") USD ($)	Dec. 31, 2013 Asarco LLC ("Asarco") USD ($)	Sep. 30, 2014 Higher Technology S.A.C. USD ($)	Sep. 30, 2013 Higher Technology S.A.C. USD ($)	Dec. 31, 2013 Higher Technology S.A.C. USD ($)	Sep. 30, 2014 Breaker, S.A. de C.V and affiliates ("Breaker") USD ($)	Sep. 30, 2013 Breaker, S.A. de C.V and affiliates ("Breaker") USD ($)	Dec. 31, 2013 Breaker, S.A. de C.V and affiliates ("Breaker") USD ($)	Sep. 30, 2014 Sempertrans and affiliates USD ($)	Sep. 30, 2013 Sempertrans and affiliates USD ($)	Dec. 31, 2013 Sempertrans and affiliates USD ($)	Sep. 30, 2014 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($)	Sep. 30, 2013 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($)	Dec. 31, 2013 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($)	Sep. 30, 2014 Pigoba S.A. de C.V. USD ($)	Sep. 30, 2013 Pigoba S.A. de C.V. USD ($)	Sep. 30, 2014 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Sep. 30, 2013 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Dec. 31, 2013 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Sep. 30, 2014 Servicios y Fabricaciones Mecanicas S.A.C. USD ($)	Sep. 30, 2013 Servicios y Fabricaciones Mecanicas S.A.C. USD ($)	Sep. 30, 2014 Companies with relationship with SCC executive officers' families USD ($)	Sep. 30, 2013 Companies with relationship with SCC executive officers' families USD ($)	Sep. 30, 2014 Grupo Mexico and affiliates USD ($)	Sep. 30, 2013 Grupo Mexico and affiliates USD ($)
Related party transactions
Related parties receivables current:	$ 28,400,000	$ 38,062,000	$ 800,000		$ 800,000			$ 26,400,000				$ 18,800,000				$ 1,200,000		$ 700,000			$ 17,200,000			$ 600,000
Related parties receivable, non-current:	161,244,000	161,244,000						161,200,000		184,000,000		161,200,000
Related parties payables:	65,519,000	28,373,000	800,000		3,300,000			39,900,000				14,400,000										700,000			18,400,000		6,200,000	100,000		100,000	600,000		300,000	100,000		100,000	1,000,000		600,000	100,000		3,800,000		3,300,000
Total purchases from related parties			10,400,000	10,400,000				137,200,000								2,600,000	4,100,000					76,800,000	36,500,000		39,500,000	82,000,000		2,100,000	1,700,000		5,700,000	2,700,000		900,000	1,000,000		2,100,000	2,000,000		400,000	100,000	17,300,000	14,900,000		1,100,000	200,000	10,200,000	5,700,000	283,800,000	147,900,000
Sales revenues from related parties								75,500,000	11,600,000							400,000	400,000					600,000	600,000		22,100,000	71,800,000											200,000	200,000											98,600,000	84,400,000
Number of power plants											2
Maximum amount of line of credit granted to related party						350,000,000
Interest rate (as a percent)						4.40%				5.75%
Percentage of interest acquired													99.999%	99.999%
Value of interest acquired													150,000,000	1,928,600,000
Ownership percentage															0.001%
Loan repaid							150,000,000													18,400,000
Interest earned								7,000,000	7,600,000
Ownership percentage																			44.20%
Loan granted																			$ 56,600,000

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