STOCKHOLDERS' EQUITY: (Tables)

3 Months Ended

Mar. 31, 2017

Activity in treasury stock in the three-month period ended March 31, 2017 and 2016 is as follows (in millions):

	2017		2016
Southern Copper common shares
Balance as of January 1,	$	2,769.0	$	2,697.6
Purchase of shares	—		53.7

Balance as of March 31,	2,769.0		2,751.3


Parent Company (Grupo Mexico) common shares
Balance as of January 1,	218.6		211.3
Other activity, including dividend, interest and foreign currency transaction effect	2.1		3.7

Balance as of March 31,	220.7		215.0


Treasury stock balance as of March 31,	$	2,989.7	$	2,966.3

Schedule of share repurchase program activity

Period		Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan	Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $35.89(1)	Total Cost ($ in millions)
From	To
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


08/01/16	08/31/16	115,000	25.88		118,910,166		3.0
09/01/16	09/30/16	587,601	25.55		119,497,767		15.0

Total third quarter		702,601	25.61				18.0


Total 2016		2,937,801	24.42				71.7

Total purchased		119,497,767	$	24.42		2,274,543	$	2,918.4

(*) NYSE closing price of SCC common shares at March 31, 2017.

Summary of non-controlling interest activity

	2017			2016
Balance as of January 1,	$	38.6		$	36.3
Net earnings	0.9			0.6
Dividend paid	(0.2		)	—

Balance as of March 31,	$	39.3		$	36.9

Employee Stock Purchase 2010 Plan

STOCKHOLDERS' EQUITY:

Schedule of stock based compensation expense and unrecognized compensation expense

The stock based compensation expense for the first quarter 2017 and 2016 and the unrecognized compensation expense under this plan were as follows (in millions):

	2017		2016
Stock based compensation expense	$	0.1	$	0.1
Unrecognized compensation expense	$	0.7	$	1.3

Schedule of stock award activity

	Shares		Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2017	1,401,096		$	2.05
Granted	—		—
Exercised	—		2.05
Forfeited	—		—

Outstanding shares at March 31, 2017	1,401,096		$	2.05


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

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

Employee Stock Purchase 2015 Plan

STOCKHOLDERS' EQUITY:

Schedule of stock based compensation expense and unrecognized compensation expense

The stock based compensation expense for the first quarter 2017 and 2016 and the unrecognized compensation expense under this plan were as follows (in millions):

	2017		2016
Stock based compensation expense	$	0.2	$	0.2
Unrecognized compensation expense	$	3.4	$	4.2

Schedule of stock award activity

	Shares		Unit Weighted Average Grant Date Fair Value

Outstanding shares at January 1, 2017	2,540,223		$	2.63
Granted	—		—
Exercised	(228,430	)	2.63
Forfeited	—		—

Outstanding shares at March 31, 2017	2,311,793		$	2.63


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

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