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STOCKHOLDERS' EQUITY: (Tables)

6 Months Ended

Jun. 30, 2024

Share based Compensation Plan

Schedule of activity in treasury stock

Activity in treasury stock in the six-month period ended June 30, 2024 and 2023 is as follows (in millions):

​	​	​	​	​	​	​
​		2024			2023
Southern Copper common shares	​	​	​	​	​	​
Balance as of January 1,	​	$	2,766.7	​	$	2,766.9
Used for corporate purposes	​		(199.7)	​		(0.1)
Balance as of June 30,	​		2,566.9	​		2,766.8
​	​	​	​	​	​	​
Parent Company (Grupo Mexico) common shares	​	​	​	​	​	​
Balance as of January 1,	​	​	382.3	​		340.7
Other activity, including dividend, interest and foreign currency transaction effect	​	​	(3.1)	​		24.3
Balance as of June 30,	​		379.3	​		365.0
Treasury stock balance as of June 30,	​	$	2,946.2	​	$	3,131.8

(*) Less than $0.1 million.

Schedule of activity in Directors' Stock Award Plan

​

​	​	​	​	​
​		2024		2023
Total SCC shares reserved for the plan		600,000		600,000
Total shares granted at January 1,		(428,800)		(416,800)
Granted in the period		(8,800)		(6,400)
Total shares granted at June 30,		(437,600)		(423,200)
Remaining shares reserved		162,400		176,800

Summary of non-controlling interest activity

The following table presents the non-controlling interest activity the six-month period ended June 30, 2024 and 2023 (in millions):

​	​	​	​	​	​	​
​		2024			2023
Balance as of January 1,		$	63.1		$	62.7
Net earnings	​		6.4	​		4.9
Dividend paid	​		(1.8)	​		(4.6)
Balance as of June 30,		$	67.7		$	63.0

​

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-month period ended June 30, 2024 and 2023 and the unrecognized compensation expense under this plan were as follows (in millions):

​	​	​	​	​	​	​
​		2024		​	2023
Stock based compensation expense	​	$	0.3		$	0.3
Unrecognized compensation expense	​	$	1.4		$	2.1

Schedule of stock award activity

​

​	​	​	​	​
​	​	​	​	Unit Weighted Average
​		Shares		Grant Date Fair Value
Outstanding shares at January 1, 2024		1,962,936	$	1.86
Granted		​	​	—
Exercised		(41,742)	$	1.86
Forfeited		​	​	—
Outstanding shares at June 30, 2024		1,921,194	$	1.86
Outstanding shares at January 1, 2023	​	2,754,506	$	1.86
Granted	​	—	​	—
Exercised	​	(694,565)	​	1.86
Forfeited	​	—	​	—
Outstanding shares at June 30, 2023		2,059,941	$	1.86

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