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STOCKHOLDERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2021

Share based Compensation Plan

Schedule of activity in treasury stock

​

Activity in treasury stock in the six-month period ended June 30, 2021 and 2020 is as follows (in millions):

​

​	​	​	​	​	​	​
​		2021			2020
Southern Copper common shares	​	​	​	​	​	​
Balance as of January 1,	​	$	2,767.5	​	$	2,767.9
Used for corporate purposes	​		(0.1)	​		—
Balance as of June 30,	​		2,767.4	​		2,767.9
​	​	​	​	​	​	​
Parent Company (Grupo Mexico) common shares	​	​	​	​	​	​
Balance as of January 1,	​		296.0	​		281.0
Other activity, including dividend, interest and foreign currency transaction effect	​		12.4	​		(7.4)
Balance as of June 30,	​		308.4	​		273.6
Treasury stock balance as of June 30,	​	$	3,075.8	​	$	3,041.5

Summary of non-controlling interest activity

The following table presents the non-controlling interest activity for the six months ended June 30, 2021 and 2020 (in millions):

​

​	​	​	​	​	​	​
​		2021			2020
Balance as of January 1,		$	51.2		$	47.9
Net earnings	​		7.0	​		2.8
Dividend paid	​		(2.9)	​		(2.6)
Balance as of June 30,		$	55.3		$	48.1

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 first semester of 2021 and 2020 and the unrecognized compensation expense under this plan were as follows (in millions):

​	​	​	​	​	​	​
​		2021			2020
Stock based compensation expense	​	$	0.3	​	$	0.3
Unrecognized compensation expense	​	$	1.1	​	$	1.7

​

Schedule of stock award activity

​

​	​	​	​	​	​
​		​		Unit Weighted Average
​	​	Shares	​	Grant Date Fair Value
Outstanding shares at January 1, 2021		1,264,410	​	$	2.63
Granted		—	​		—
Exercised		(370,959)	​	$	2.63
Forfeited		—	​		—
Outstanding shares at June 30, 2021		893,451	​	$	2.63
Outstanding shares at January 1, 2020		1,379,734	​	$	2.63
Granted		—	​		—
Exercised		(54,221)	​	$	2.63
Forfeited		—	​		—
Outstanding shares at June 30, 2020		1,325,513	​	$	2.63

​

Employee Stock Purchase 2018 Plan

Share based Compensation Plan

Schedule of stock based compensation expense and unrecognized compensation expense

​

The stock based compensation expense for the six months ended June 30, 2021 and 2020 and the unrecognized compensation expense under this plan were as follows (in millions):

​	​	​	​	​	​	​
​		2021		​	2020
Stock based compensation expense	​	$	0.3		$	0.3
Unrecognized compensation expense	​	$	3.6		$	4.2

​

Schedule of stock award activity

​

​	​	​	​	​
​	​	​	​	Unit Weighted Average
​		Shares		Grant Date Fair Value
Outstanding shares at January 1, 2021		3,918,458	$	1.86
Granted		—	​	—
Exercised		(625,742)	$	1.86
Forfeited		—	​	—
Outstanding shares at June 30, 2021		3,292,716	$	1.86
Outstanding shares at January 1, 2020	​	4,002,898	$	1.86
Granted	​	—	​	—
Exercised	​	(37,940)	​	1.86
Forfeited	​	—	​	—
Outstanding shares at June 30, 2020		3,964,958	$	1.86

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