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STOCKHOLDERS' EQUITY: (Tables)

3 Months Ended

Mar. 31, 2019

STOCKHOLDERS' EQUITY:

Schedule of activity in treasury stock

Activity in treasury stock in the three-month period ended March 31, 2019 and 2018 is as follows (in millions):

		2019			2018
Southern Copper common shares
Balance as of January 1,		$	2,768.3		$	2,768.7
Purchase of shares			—			—
Balance as of March 31,			2,768.3			2,768.7
Parent Company (Grupo Mexico) common shares
Balance as of January 1,			251.3			232.4
Other activity, including dividend, interest and foreign currency transaction effect			6.4			6.5
Balance as of March 31,			257.7			238.9
Treasury stock balance as of March 31,		$	3,026.0		$	3,007.6

Summary of non-controlling interest activity

The following table presents the non-controlling interest activity for the three months ended March 31, 2019 and 2018:

		2019			2018
Balance as of January 1,		$	45.4		$	41.7
Net earnings			1.0			1.2
Dividend paid			(0.1)			(0.3)
Balance as of March 31,		$	46.3		$	42.6

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 2019 and 2018 and the unrecognized compensation expense under this plan were as follows (in millions):

		2019			2018
Stock based compensation expense		$	0.2		$	0.2
Unrecognized compensation expense		$	2.4		$	3.0

Schedule of stock award activity

				Unit Weighted Average
		Shares		Grant Date Fair Value
Outstanding shares at January 1, 2019		1,840,336		$	2.63
Granted		—			—
Exercised		(247,670)			2.63
Forfeited		—			—
Outstanding shares at March 31, 2019		1,592,666		$	2.63
Outstanding shares at January 1, 2018		2,293,120		$	2.63
Granted		—			—
Exercised		(1,873)			2.63
Forfeited		—			—
Outstanding shares at March 31, 2018		2,291,247		$	2.63

Employee Stock Purchase 2018 Plan

STOCKHOLDERS' EQUITY:

Schedule of stock based compensation expense and unrecognized compensation expense

The stock based compensation expense for the three months ended March 31, 2019 and the unrecognized compensation expense under this plan were as follows (in millions):

		2019
Stock based compensation expense		$	0.1
Unrecognized compensation expense		$	3.5

Schedule of stock award activity

The following table presents the stock award activity of this plan for the three months ended March 31, 2019:

				Unit Weighted Average
		Shares		Grant Date Fair Value
Outstanding shares at January 1, 2019		2,782,424		$	1.86
Granted		—			—
Exercised		—			—
Forfeited		—			—
Outstanding shares at March 31, 2019		2,782,424		$	1.86

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