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STOCKHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2020

Share based Compensation Plan

Schedule of activity in treasury stock

​

Activity in treasury stock in the years 2020 and 2019 was as follows (in millions):

​

​	​	​	​	​	​	​
​		2020			2019
Southern Copper common shares	​	​	​	​	​	​
Balance as of January 1,	​	$	2,767.9	​	$	2,768.3
Used for corporate purposes	​		(0.4)	​		(0.4)
Balance as of December 31,	​		2,767.5	​		2,767.9
​	​	​	​	​	​	​
Parent Company (Grupo Mexico) common shares	​	​	​	​	​	​
Balance as of January 1,	​		281.0	​		251.3
Other activity, including dividend, interest and foreign currency transaction effect	​		15.0	​		29.7
Balance as of December 31,	​		296.0	​		281.0
Treasury stock balance as of December 31,	​	$	3,063.5	​	$	3,048.9

Schedule of activity in Directors' Stock Award Plan

​

​	​	​	​	​
​		2020		2019
Total SCC shares reserved for the plan		600,000		600,000
Total shares granted at January 1,		(377,200)		(362,800)
Granted in the period		(14,400)		(14,400)
Total shares granted at December 31,		(391,600)		(377,200)
Remaining shares reserved		208,400		222,800

​

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 years ended December 31, 2020, 2019 and 2018 and the unrecognized compensation expense under this plan were as follows (in millions):

​	​	​	​	​	​	​	​	​	​
​		2020			2019			2018
Stock based compensation expense	​	$	0.6	​	$	0.6	​	$	0.6
Unrecognized compensation expense	​	$	1.4	​	$	2.0	​	$	2.6

​

Schedule of stock award activity

​

​	​	​	​	​	​
​		​		Unit Weighted Average
​	​	Shares	​	Grant Date Fair Value
Outstanding shares at January 1, 2020		1,379,734	​	$	2.63
Granted		—	​		​
Exercised		(115,324)	​	$	2.63
Forfeited		—	​		—
Outstanding shares at December 31, 2020		1,264,410	​	$	2.63
Outstanding shares at January 1, 2019		1,840,336	​	$	2.63
Granted		—	​		—
Exercised		(460,602)	​	$	2.63
Forfeited		—	​		—
Outstanding shares at December 31, 2019		1,379,734	​	$	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 years ended December 31, 2020 and 2019 and the unrecognized compensation expense under this plan were as follows (in millions):

​

​	​	​	​	​	​	​
​		2020		​	2019
Stock based compensation expense	​	$	0.7		$	0.7
Unrecognized compensation expense	​	$	3.8		$	4.5

Schedule of stock award activity

​

​	​	​	​	​
​	​	​	​	Unit Weighted Average
​		Shares		Grant Date Fair Value
Outstanding shares at January 1, 2020		4,002,898	$	1.86
Granted		—	​	​
Exercised		(84,440)	$	1.86
Forfeited		—		​
Outstanding shares at December 31, 2020		3,918,458	$	1.86
Outstanding shares at January 1, 2019	​	2,782,424	$	1.86
Granted	​	1,238,169	$	1.86
Exercised	​	(17,695)	$	1.86
Forfeited	​	—		—
Outstanding shares at December 31, 2019		4,002,898	$	1.86

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