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STOCKHOLDERS' EQUITY: (Tables)

12 Months Ended

Dec. 31, 2015

Share based Compensation Plan

Schedule of activity in treasury stock

Activity in treasury stock in the years 2015 and 2014 was as follows (in millions):

		2015			2014
Southern Copper common shares
Balance as of January 1,		$	1,693.5		$	1,011.0
Purchase of shares		1,004.4			682.7
Used for corporate purposes		(0.3		)	(0.2		)
Balance as of December 31,		2,697.6			1,693.5
Parent Company (Grupo Mexico) common shares
Balance as of January 1,		207.1			205.5
Other activity, including dividend, interest and foreign currency transaction effect		4.2			1.6
Balance as of December 31,		211.3			207.1
Treasury stock balance as of December 31,		$	2,908.9		$	1,900.6

Schedule of share repurchase program activity

											Maximum
											Number of Shares
									Total Number of		that May Yet Be
				Total Number		Average			Shares Purchased		Purchased Under		Total Cost
Period				of Shares		Price Paid			as Part of Publicly		the Plan		($ in
From		To		Purchased		per Share			Announced Plan		@ $26.12(1)		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
07/01/15		07/31/15		1,603,800		27.84			96,066,793				44.7
08/01/15		08/31/15		6,160,000		26.90			102,226,793				165.7
09/01/15		09/30/15		3,724,273		26.69			105,951,066				99.4
Total third quarter				11,488,073		26.97							309.8
10/01/15		10/31/15		1,525,000		28.08			107,476,066				42.8
11/01/15		11/30/15		4,635,000		26.59			112,111,066				123.2
12/01/15		12/31/15		4,448,900		25.61			116,559,966				114.0
Total fourth quarter				10,608,900		26.39							280.0
Total 2015				36,689,052		27.38			116,559,966				1,004.4
Total purchased				116,559,966		$	24.42				5,871,706		2,846.6

(1) NYSE closing price of SCC common shares at December 31, 2015.

Schedule of activity in Directors' Stock Award Plan

		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 December 31,		(322,800	)	(309,600	)
Remaining shares reserved		277,200		290,400

Employee Stock Purchase 2007 Plan

Share based Compensation Plan

Schedule of stock based compensation expense and unrecognized compensation expense

		2014			2013
Stock based compensation expense		$	2.1		$	2.1
Unrecognized compensation expense		—			$	2.1

Schedule of stock award activity

		Shares		Unit Weighted Average Grant Date Fair Value
Outstanding shares at January 1, 2015		4,298,612		$	1.16
Granted		—		—
Exercised		(4,189,371	)	1.16
Forfeited		—		—
Outstanding shares at December 31, 2015		109,241		$	1.16

Outstanding shares at January 1, 2014		4,449,599		$	1.16
Granted		—		—
Exercised		(150,987	)	1.16
Forfeited		—		—
Outstanding shares at December 31, 2014		4,298,612		$	1.16

Employee Stock Purchase 2010 Plan

Share based Compensation Plan

Schedule of stock based compensation expense and unrecognized compensation expense

		2015			2014			2013
Stock based compensation expense		$	0.6		$	0.6		$	0.6
Unrecognized compensation expense		$	1.4		$	2.0		$	2.6

Schedule of stock award activity

		Shares		Unit Weighted Average Grant Date Fair Value
Outstanding shares at January 1, 2015		2,287,891		$	2.05
Granted		—		—
Exercised		(60,309	)	2.05
Forfeited		—		—
Outstanding shares at December 31, 2015		2,227,582		2.05
Outstanding shares at January 1, 2014		3,012,464		$	2.05
Granted		—		—
Exercised		(724,573	)	2.05
Forfeited		—		—
Outstanding shares at December 31, 2014		2,287,891		$	2.05

Employee Stock Purchase 2015 Plan

Share based Compensation Plan

Schedule of stock based compensation expense and unrecognized compensation expense

The stock based compensation expense for the year ended December 31, 2015 and the unrecognized compensation expense under this plan were as follows (in millions):

		2015
Stock based compensation expense		$	0.4
Unrecognized compensation expense		$	4.4

Schedule of stock award activity

		Shares		Unit Weighted Average Grant Date Fair Value
Outstanding shares at January 1, 2015		—		—
Granted		2,652,386		$	2.63
Exercised		—		—
Forfeited		—		—
Outstanding shares at December 31, 2015		2,652,386		$	2.63

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