STOCKHOLDERS' EQUITY: (Tables)

6 Months Ended

Jun. 30, 2013

STOCKHOLDERS' EQUITY:

Schedule of activity in treasury stock

Activity in treasury stock in the six-month period ended June 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	64.5			33.2
Stock dividend	—			(151.4		)
Used for corporate purposes	(0.2		)	(0.3		)
Balance as of June 30,	794.1			615.6
Parent Company (Grupo Mexico) common shares
Balance as of January 1,	189.0			163.7
Other activity, including dividend, interest and currency translation effect	10.9			9.9
Balance as of June 30,	199.9			173.6
Treasury stock balance as of June 30,	$	994.0		$	789.2

Schedule of share distributions

	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)	2.4	0.1

Schedule of share repurchase program activity

Period		Total Number of Shares	Average Price Paid		Total Number of Shares Purchased as Part of Publicly	Maximum Number of Shares that May Yet Be Purchased Under the Plan	Total Cost
From	To	Purchased	per Share		Announced Plan	@ $27.62	($ 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	782,800	32.31		47,698,786		25.2
06/01/13	06/30/13	1,350,000	29.05		49,048,786		39.2
Total second quarter		2,134,300	30.25				64.5
Total purchased		49,048,786	$	19.22		2,077,643	$	942.6

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 June 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 six months ended June 30, 2013 and 2012 and the unrecognized compensation expense as of June 30, 2013 and 2012 under this plan were as follows (in millions):

	2013		2012
Stock based compensation expense	$	1.1	$	1.1
Unrecognized compensation expense	$	3.1	$	5.3

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 six months ended June 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	(2,385,483	)	1.16
Forfeited	(31,159	)	1.16
Outstanding shares at June 30, 2013	4,538,930		$	1.16
Outstanding shares at January 1, 2012	7,270,341		$	1.16
Granted	—		—
Exercised	(36,303	)	1.16
Forfeited	(90,204	)	1.16
Outstanding shares at June 30, 2012	7,143,834		$	1.16

New 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 six months ended June 30, 2013 and 2012 and the unrecognized compensation expense as of June 30, 2013 and 2012 under this plan were as follows (in millions):

	2013		2012
Stock based compensation expense	$	0.1	$	0.5
Unrecognized compensation expense	$	2.9	$	3.5

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 six months ended June 30, 2013 and 2012:

	Shares		Unit Weighted Average Grant Date Fair Value
Outstanding shares at January 1, 2013	2,944,742		$	2.05
Granted	—		—
Exercised	(10,308	)	2.05
Forfeited	(64,551	)	2.05
Outstanding shares at June 30, 2013	2,869,883		$	2.05
Outstanding shares at January 1, 2012	3,807,146		$	2.05
Granted	—		—
Exercised	(646,065	)	2.05
Forfeited	(72,863	)	2.05
Outstanding shares at June 30, 2012	3,088,218		$	2.05