STOCKHOLDERS' EQUITY: (Tables)

9 Months Ended

Sep. 30, 2013

Activity in treasury stock in the nine-month period ended September 30, 2013 and 2012 is as follows (in millions):

	2013			2012
Southern Copper common shares
Balance as of January 1,	$	729.8		$	734.1
Purchase of shares	124.0			132.4
Stock dividend	—			(151.4		)
Used for corporate purposes	(0.3		)	(0.3		)
Balance as of September 30,	853.5			714.8

Parent Company (Grupo Mexico) common shares
Balance as of January 1,	189.0			163.7
Other activity, including dividend, interest and currency translation effect	12.9			24.1
Balance as of September 30,	201.9			187.8

Treasury stock balance as of September 30,	$	1,055.4		$	902.6

Schedule of share distributions

The following table summarizes share distributions in the nine months of 2013 and 2012:

	2013	2012
Southern Copper common shares
Directors’ Stock Award Plan	12,000	14,400

Parent Company (Grupo Mexico) common shares
Employee stock purchase plan (shares in millions)	4.5	7.0

Schedule of share repurchase program activity

						Maximum Number
					Total Number of	of Shares that May
		Total Number of	Average		Shares Purchased as	Yet Be Purchased
Period		Shares	Price Paid		Part of Publicly	Under the Plan	Total Cost
From	To	Purchased	per Share		Announced Plan	*@ $27.24 ()**	($ in millions)

2008:
08/11/08	12/31/08	28,510,150	$	13.49	28,510,150		$	384.7
2009:
01/12/09	09/30/09	4,912,000	14.64		33,422,150		71.9
2010:
05/05/10	10/14/10	15,600	29.69		33,437,750		0.5
2011:
05/02/11	12/31/11	9,034,400	30.29		42,472,150		273.7
2012:
04/10/12	10/31/12	4,442,336	33.17		46,914,486		147.3
2013:
04/01/13	04/30/13	1,500	32.96		46,915,986		0.1
05/01/13	05/31/13	807,100	32.33		47,723,086		26.1
06/01/13	06/30/13	1,350,000	29.05		49,073,086		39.2
Total second quarter		2,158,600	30.28				65.4

07/01/13	07/31/13	1,300,000	27.60		50,373,086		35.9
08/01/13	08/31/13	641,400	26.68		51,014,486		17.1
09/01/13	09/30/13	204,012	27.65		51,218,498		5.6
Total third quarter		2,145,412	27.33				58.6

Total nine months 2013		4,304,012	28.81				124.0

Total purchased		51,218,498	$	19.56		36,635,590	$	1,002.1

(*) NYSE closing price of SCC common shares at September 30, 2013.

Schedule of activity in Directors' Stock Award Plan

	2013		2012
Total SCC shares reserved for the plan	600,000		600,000

Total shares granted at January 1,	(285,600	)	(271,200	)
Granted in the period	(12,000	)	(14,400	)
Total shares granted at September 30,	(297,600	)	(285,600	)

Remaining shares reserved	302,400		314,400

Deduction from the amount to be paid to the employee in case of voluntary resignation

If the resignation occurs during:	% Deducted
1st year after the grant date	90	%
2nd year after the grant date	80	%
3rd year after the grant date	70	%
4th year after the grant date	60	%
5th year after the grant date	50	%
6th year after the grant date	40	%
7th year after the grant date	20	%

Deduction from the amount to be paid to the employee in case of involuntary termination

If the termination occurs during:	% Deducted
1st year after the grant date	100	%
2nd year after the grant date	95	%
3rd year after the grant date	90	%
4th year after the grant date	80	%
5th year after the grant date	70	%
6th year after the grant date	60	%
7th year after the grant date	50	%

Employee Stock Purchase Plan

Share based compensation plan

Schedule of stock-based compensation expense and unrecognized compensation expense

The stock based compensation expense for the nine months ended September 30, 2013 and 2012 and the unrecognized compensation expense as of September 30, 2013 and 2012 under this plan were as follows (in millions):

	2013		2012
Stock based compensation expense	$	1.6	$	1.6
Unrecognized compensation expense	$	2.6	$	4.8

Schedule of stock award activity of the Employee Stock Purchase Plan

The following table presents the stock award activity of the Employee Stock Purchase Plan for the nine months ended September 30, 2013 and 2012:

	Shares		Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2013	6,955,572		$	1.16
Granted	—		—
Exercised	(2,396,354	)	1.16
Forfeited	(31,159	)	1.16
Outstanding shares at September 30, 2013	4,528,059		$	1.16

Outstanding shares at January 1, 2012	7,270,341		$	1.16
Granted	—		—
Exercised	(208,199	)	1.16
Forfeited	(94,339	)	1.16
Outstanding shares at September 30, 2012	6,967,803		$	1.16

New Employee Stock Purchase Plan

Share based compensation plan

Schedule of stock-based compensation expense and unrecognized compensation expense

	2013		2012
Stock based compensation expense	$	0.4	$	0.4
Unrecognized compensation expense	$	2.8	$	3.4

Schedule of stock award activity of the Employee Stock Purchase Plan

The following table presents the stock award activity of the New Employee Stock Purchase Plan for the nine months ended September 30, 2013 and 2012:

	Shares		Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2013	2,944,742		$	2.05
Granted	226,613		2.05
Exercised	(22,470	)	2.05
Forfeited	(103,513	)	2.05
Outstanding shares at September 30, 2013	3,045,372		$	2.05

Outstanding shares at January 1, 2012	3,807,146		$	2.05
Granted	—		—
Exercised	(727,134	)	2.05
Forfeited	(89,554	)	2.05
Outstanding shares at September 30, 2012	2,990,458		$	2.05