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STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 2021

Share based Compensation Plan

Schedule of activity in treasury stock

​

Activity in treasury stock in the three-month period ended March 31, 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	​		—	​		—
Balance as of March 31,	​		2,767.5	​		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	​		(2.3)	​		(14.7)
Balance as of March 31,	​		293.7	​		266.3
Treasury stock balance as of March 31,	​	$	3,061.2	​	$	3,034.2

Summary of non-controlling interest activity

The following table presents the non-controlling interest activity for the three months ended March 31, 2021 and 2020 (in millions):

​

​	​	​	​	​	​	​
​		2021			2020
Balance as of January 1,		$	51.2		$	47.9
Net earnings	​		3.3	​		1.4
Dividend paid	​		(1.3)	​		(2.3)
Balance as of March 31,		$	53.2		$	47.0

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

​	​	​	​	​	​	​
​		2021			2020
Stock based compensation expense	​	$	0.2	​	$	0.2
Unrecognized compensation expense	​	$	1.2	​	$	1.8

​

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		(293,041)	​	$	2.63
Forfeited		—	​		—
Outstanding shares at March 31, 2021		971,369	​	$	2.63
Outstanding shares at January 1, 2020		1,379,734	​	$	2.63
Granted		—	​		—
Exercised		(54,221)	​	$	2.63
Forfeited		—	​		—
Outstanding shares at March 31, 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 three months ended March 31, 2021 and 2020 and the unrecognized compensation expense under this plan were as follows (in millions):

​	​	​	​	​	​	​
​		2021		​	2020
Stock based compensation expense	​	$	0.2		$	0.2
Unrecognized compensation expense	​	$	3.6		$	4.3

​

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		(592,768)		1.86
Forfeited		—	​	—
Outstanding shares at March 31, 2021		3,325,690	$	1.86
Outstanding shares at January 1, 2020	​	4,002,898	$	1.86
Granted	​	—	​	—
Exercised	​	—	​	—
Forfeited	​	—	​	—
Outstanding shares at March 31, 2020		4,002,898	$	1.86

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