STOCKHOLDERS' EQUITY: (Tables)

12 Months Ended

Dec. 31, 2014

Activity in treasury stock in the years 2014 and 2013 was as follows (in millions):

	2014			2013
Southern Copper common shares
Balance as of January 1,	$	1,011.0		$	729.8
Purchase of shares	682.8			281.4
Used for corporate purposes	(0.3		)	(0.2		)
Balance as of December 31,	1,693.5			1,011.0

Parent Company (Grupo Mexico) common shares
Balance as of January 1,	205.6			189.0
Other activity, including dividend, interest and currency translation effect	1.6			16.6
Balance as of December 31,	207.2			205.6

Treasury stock balance as of December 31,	$	1,900.7		$	1,216.6

Schedule of share repurchase program activity

						Maximum Number
					Total Number of	of Shares that May
		Total Number of	Average Price		Shares Purchased as	Yet Be Purchased		Total Cost
Period		Shares	Paid per		Part of Publicly	Under the Plan		($ in
From	To	Purchased	Share		Announced Plan	@ $28.20 (1)		millions)
2008	2011	42,472,150	$	17.20	42,472,150			$	730.8
2012:		4,442,336	33.17		46,914,486			147.3
2013:		10,245,000	27.47		57,159,486			281.4
2014:
01/01/14	01/31/14	1,768,000	28.06		58,927,486			49.6
03/01/14	03/21/14	106,079	27.04		59,033,565			2.9
Total first quarter		1,874,079	28.00					52.5

06/01/14	06/30/14	450,532	28.92		59,484,097			13.0
Total second quarter		450,532	28.92					13.0

07/01/14	07/31/14	724,516	33.04		60,208,613			23.9
08/01/14	08/31/14	4,926,534	32.09		65,135,147			158.1
09/01/14	09/30/14	4,498,263	31.44		69,633,410			141.4
Total third quarter		10,149,313	31.87					323.4

10/01/14	10/31/14	5,821,213	28.86		75,454,623			168.0
11/01/14	11/30/14	1,286,767	29.50		76,741,390			38.0
12/01/14	12/31/14	3,129,524	28.08		79,870,914			87.9
Total fourth quarter		10,237,504	28.70					293.9

Total purchased		79,870,914	$	23.07		5,593,347	(2)	$	1,842.3

(1) NYSE closing price of SCC common shares at December 31, 2014.

(2) Maximum number of shares will increase by approximately 35.5 million shares, with the Board authorized increase of $1 billion approved on January 29, 2015.

Schedule of activity in Directors' Stock Award Plan

	2014		2013
Total SCC shares reserved for the plan	600,000		600,000

Total shares granted at January 1,	(297,600	)	(285,600	)
Granted in the period	(12,000	)	(12,000	)
Total shares granted at December 31,	(309,600	)	(297,600	)

Remaining shares reserved	290,400		302,400

Employee Stock Purchase Plan

Share based compensation plan

Schedule of stock based compensation expense and unrecognized compensation expense

	2014		2013		2012
Stock based compensation expense	$	2.1	$	2.1	$	2.1
Unrecognized compensation expense	—		$	2.1	$	4.2

Schedule of stock award activity

	Shares		Unit Weighted Average Grant Date Fair Value
Outstanding shares at January 1, 2014	4,449,599		$	1.16
Granted	—		—
Exercised	(150,987	)	1.16
Forfeited	—		1.16
Outstanding shares at December 31, 2014	4,298,612		1.16

Outstanding shares at January 1, 2013	6,955,572		$	1.16
Granted	—		—
Exercised	(2,474,814	)	1.16
Forfeited	(31,159	)	1.16
Outstanding shares at December 31, 2013	4,449,599		1.16

New Employee Stock Purchase Plan

Share based compensation plan

Schedule of stock based compensation expense and unrecognized compensation expense

	2014		2013		2012
Stock based compensation expense	$	0.6	$	0.6	$	0.6
Unrecognized compensation expense	$	2.0	$	2.6	$	3.2

Schedule of stock award activity

	Shares		Unit Weighted Average Grant Date Fair Value
Outstanding shares at January 1, 2014	3,012,464		$	2.05
Granted	—		—
Exercised	(724,573	)	2.05
Forfeited	—		—
Outstanding shares at December 31, 2014	2,287,891		2.05

Outstanding shares at January 1, 2013	2,944,742		$	2.05
Granted	226,613		2.05
Exercised	(38,098	)	2.05
Forfeited	(120,793	)	2.05
Outstanding shares at December 31, 2013	3,012,464		2.05