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STOCKHOLDERS' EQUITY: (Tables)

6 Months Ended

Jun. 30, 2025

Share based Compensation Plan

Schedule of activity in treasury stock

Activity in treasury stock in the six-month periods ended June 30, 2025 and 2024 was as follows (in millions):

​

​	​	​	​	​	​	​
​		2025			2024
Southern Copper common shares	​	​	​	​	​	​
Balance as of January 1,	​	$	2,337.3	​	$	2,766.7
Dividends paid in common stock	​		(338.8)	​		(199.5)
Used for corporate purposes	​		(0.2)	​		(0.2)
Balance as of June 30,	​		1,998.4	​		2,567.0
​	​	​	​	​	​	​
Parent Company (Grupo Mexico) common shares	​	​	​	​	​	​
Balance as of January 1,	​		363.4	​		382.3
Other activity, including dividend, interest and foreign currency translation effect	​		10.2	​		(3.1)
Balance as of June 30,	​		373.5	​		379.3
Treasury stock balance as of June 30,	​	$	2,371.9	​	$	2,946.2

Schedule of activity in Directors' Stock Award Plan

​

​	​	​	​	​
​		2025		2024
Total SCC shares reserved for the plan		600,000		600,000
Total shares granted at January 1,		(444,400)		(428,800)
Granted in the period		(6,400)		(8,800)
Total shares granted at June 30,		(450,800)		(437,600)
Remaining shares reserved		149,200		162,400

Summary of non-controlling interest activity

The following table presents the non-controlling interest activity for the six-month periods ended June 30, 2025 and 2024 (in millions):

​

​	​	​	​	​	​	​
​		2025			2024
Balance as of January 1,		$	66.6		$	63.1
Net earnings	​		6.4	​		6.4
Dividend paid	​		(4.4)	​		(1.8)
Balance as of June 30,		$	68.6		$	67.7

​

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, 2025 and 2024 and the unrecognized compensation expense under this plan were as follows (in millions):

​

​	​	​	​	​	​	​
​		2025		​	2024
Stock based compensation expense	​	$	0.3		$	0.3
Unrecognized compensation expense	​	$	0.7		$	1.4

Schedule of stock award activity

​

​	​	​	​	​
​	​	​	​	Unit Weighted Average
​		Shares		Grant Date Fair Value
Outstanding shares at January 1, 2025		1,901,089	$	1.86
Granted		—	$	—
Exercised		(602,500)		1.86
Forfeited		—	​	—
Outstanding shares at June 30, 2025		1,298,589	$	1.86
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

Employee Stock Purchase 2025 Plan

Share based Compensation Plan

Schedule of stock award activity

​

​	​	​	​	​
​	​	​	​	Unit Weighted Average
​		Shares		Grant Date Fair Value
Outstanding shares at January 1, 2025		—	​	—
Granted		2,372,449	$	4.94
Exercised		—		—
Forfeited		—	​	—
Outstanding shares at June 30, 2025		2,372,449	$	4.94

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