STOCKHOLDERS' EQUITY: (Tables)

Activity in treasury stock in the six-month period ended June 30, 2015 and 2014 is as follows (in millions):

	2015			2014
Southern Copper common shares
Balance as of January 1,	$	1,693.5		$	1,011.0
Purchase of shares	414.6			65.5
Used for corporate purposes	(0.4		)	(0.3		)

Balance as of June 30,	2,107.7			1,076.2


Parent Company (Grupo Mexico) common shares
Balance as of January 1,	207.2			205.6
Other activity, including dividend, interest and currency translation effect	(2.5		)	8.8

Balance as of June 30,	204.7			214.4


Treasury stock balance as of June 30,	$	2,312.4		$	1,290.6

The following table summarizes share distributions in the first six months of 2015 and 2014:

	2015	2014
Southern Copper common shares
Directors’ Stock Award Plan	13,200	12,000

Parent Company (Grupo Mexico) common shares
Employee stock purchase plan (shares in millions)	0.2	0.7

					Total Number of	Maximum Number
			Average		Shares	of Shares that May
		Total Number	Price		Purchased as	Yet Be Purchased
Period		of Shares	Paid per		Part of Publicly	Under the Plan	Total Cost
From	To	Purchased	Share		Announced Plan	@ $29.41 (*)	($ in millions)
2008	2012	46,914,486	$	18.72	46,914,486		$	878.1
2013		10,245,000	27.47		57,159,486		281.4
2014		22,711,428	30.06		79,870,914		682.8
2015
01/01/15	01/31/15	5,927,154	27.12		85,798,068		160.7
02/01/15	02/28/15	2,590,076	29.45		88,388,144		76.3
03/01/15	03/31/15	4,563,649	29.16		92,951,793		133.1

Total first quarter		13,080,879	29.29				370.1

04/01/15	04/30/15	1,511,200	29.42		94,462,993		44.5

Total second quarter		1,511,200	29.42				44.5
						25,269,210
Total purchased		94,462,993	$	23.89			$	2,256.9

(*) NYSE closing price of SCC common shares at June 30, 2015.

	2015		2014
Total SCC shares reserved for the plan	600,000		600,000


Total shares granted at January 1,	(309,600	)	(297,600	)
Granted in the period	(13,200	)	(12,000	)

Total shares granted at June 30,	(322,800	)	(309,600	)

Remaining shares reserved	277,200		290,400

	Shares		Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2015	4,298,612		$	1.16
Granted	—		—
Exercised	(4,128,970	)	1.16
Forfeited	—		—

Outstanding shares at June 30, 2015	169,642		$	1.16


Outstanding shares at January 1, 2014	4,449,599		$	1.16
Granted	—		—
Exercised	(58,663	)	1.16
Forfeited	—		—

Outstanding shares at June 30, 2014	4,390,936		$	1.16

The stock based compensation expense for the first six months of 2015 and 2014 and the unrecognized compensation expense under this plan were as follows (in millions):

	2015		2014
Stock based compensation expense	$	0.2	$	0.1
Unrecognized compensation expense	$	1.9	$	2.4

	Shares		Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2015	2,287,891		$	2.05
Granted	—		—
Exercised	(20,273	)	$	2.05
Forfeited	—		—

Outstanding shares at June 30, 2015	2,267,618		$	2.05


Outstanding shares at January 1, 2014	3,012,464		$	2.05
Granted	—		—
Exercised	(669,157	)	2.05
Forfeited	—		—

Outstanding shares at June 30, 2014	2,343,307		$	2.05

The stock based compensation expense for the first six months of 2015 and the unrecognized compensation expense under this plan were as follows (in millions):

	2015
Stock based compensation expense	$	—
Unrecognized compensation expense	$	4.8

	Shares	Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2015	—		—
Granted	2,652,886	$	2.63
Exercised	—	—
Forfeited	—	—

Outstanding shares at June 30, 2015	2,652,886	$	2.63

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	%

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	%