STOCKHOLDERS' EQUITY: (Tables)

Activity in treasury stock in the three-month period ended March 31, 2016 and 2015 is as follows (in millions):

	2016		2015
Southern Copper common shares
Balance as of January 1,	$	2,697.6	$	1,693.5
Purchase of shares	53.7		370.1

Balance as of March 31,	2,751.3		2,063.6


Parent Company (Grupo Mexico) common shares
Balance as of January 1,	211.3		207.2
Other activity, including dividend, interest and foreign currency transaction effect	3.7		(2.9		)

Balance as of March 31,	215.0		204.3


Treasury stock balance as of March 31,	$	2,966.3	$	2,267.9

Period		Total Number of Shares	Average Price Paid per		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	Share		Announced Plan	@ $27.71 (*)	($ 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		36,689,052	27.38		116,559,966		1,004.4
2016
01/01/16	01/31/16	2,235,200	24.05		118,795,166		53.7

Total first quarter		2,235,200	24.05				53.7


Total purchased		118,795,166	$	24.41		3,595,217	$	2,900.4

(*) NYSE closing price of SCC common shares at March 31, 2016.

	2016		2015
Balance as of January 1,	$	36.3	$	32.1
Net earnings	0.6		1.3
Dividend paid	—		(0.2		)

Balance as of March 31,	$	36.9	$	33.2

	Shares		Unit Weighted Average Grant Date Fair Value
Outstanding shares at January 1, 2016	109,241		$	1.16
Granted	—		—
Exercised	—		—
Forfeited	—		—

Outstanding shares at March 31, 2016	109,241		$	1.16


Outstanding shares at January 1, 2015	4,298,612		$	1.16
Granted	—		—
Exercised	(3,660,945	)	$	1.16
Forfeited	—		—

Outstanding shares at March 31, 2015	637,667		$	1.16

The stock based compensation expense for the first quarter 2016 and 2015 and the unrecognized compensation expense under this plan were as follows (in millions):

	2016		2015
Stock based compensation expense	$	0.1	$	0.1
Unrecognized compensation expense	$	1.3	$	2.0

	Shares		Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2016	2,227,582		$	2.05
Granted	—		—
Exercised	(338,989	)	2.05
Forfeited	—		—


Outstanding shares at March 31, 2016	1,888,593		$	2.05



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


Outstanding shares at March 31, 2015	2,287,891		$	2.05

The stock based compensation expense for the first quarter 2016 and 2015 and the unrecognized compensation expense under this plan were as follows (in millions):

	2016		2015
Stock based compensation expense	$	0.2	—
Unrecognized compensation expense	$	4.2	—

	Shares	Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2016	2,652,386	$	2.63
Granted	—	—
Exercised	—	—
Forfeited	—	—

Outstanding shares at March 31, 2016	2,652,386	$	2.63


Outstanding shares at January 1, 2015	—	—
Granted	2,652,386	$	2.63
Exercised	—	—
Forfeited	—	—

Outstanding shares at March 31, 2015	2,652,386	$	2.63