STOCKHOLDERS' EQUITY: (Details) (USD $)	1 Months Ended		3 Months Ended	12 Months Ended						68 Months Ended		3 Months Ended			3 Months Ended
	Mar. 21, 2014	Jan. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Treasury stock Southern Copper	Mar. 31, 2013 Treasury stock Southern Copper	Dec. 31, 2012 Treasury stock Southern Copper	Mar. 31, 2014 Treasury stock Parent Company (Grupo Mexico)	Mar. 31, 2013 Treasury stock Parent Company (Grupo Mexico)
Activity in treasury stock
Balance at the beginning of the period		$ 1,216,599,000	$ 1,216,599,000								$ 931,200,000	$ 1,011,000,000	$ 729,800,000	$ 729,800,000	$ 205,600,000	$ 189,000,000
Purchase of shares	2,900,000	49,600,000	52,500,000	281,400,000	147,300,000	273,700,000	500,000	71,900,000	384,700,000	1,212,000,000		52,500,000
Other activity, including dividend, interest and currency translation effect															6,300,000	12,400,000
Balance at the end of the period			$ 1,275,403,000	$ 1,216,599,000						$ 1,275,403,000	$ 931,200,000	$ 1,063,500,000	$ 729,800,000	$ 729,800,000	$ 211,900,000	$ 201,400,000
Treasury stock balance at the end of the period (in shares)												51,152,615	39,045,536		72,814,824	76,394,108