STOCKHOLDERS' EQUITY: (Tables)

12 Months Ended

Dec. 31, 2022

Share based Compensation Plan

Schedule of activity in treasury stock

Activity in treasury stock in the years 2022 and 2021 was as follows (in millions):

	2022		2021
Southern Copper common shares
Balance as of January 1,	$	2,767.2	$	2,767.5
Used for corporate purposes		(0.3)		(0.3)
Balance as of December 31,		2,766.9		2,767.2
Parent Company (Grupo Mexico) common shares
Balance as of January 1,		306.8		296.0
Other activity, including dividend, interest and foreign currency transaction effect		33.9		10.8
Balance as of December 31,		340.7		306.8
Treasury stock balance as of December 31,	$	3,107.6	$	3,074.0

Schedule of activity in Directors' Stock Award Plan

	2022	2021
Total SCC shares reserved for the plan	600,000	600,000
Total shares granted at January 1,	(405,200)	(391,600)
Granted in the period	(11,600)	(13,600)
Total shares granted at December 31,	(416,800)	(405,200)
Remaining shares reserved	183,200	194,800

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, 2022, 2021 and 2020 and the unrecognized compensation expense under this plan were as follows (in millions):

	2022		2021		2020
Stock based compensation expense	$	0.6	$	0.6	$	0.6
Unrecognized compensation expense	$	0.2	$	0.8	$	1.4

Schedule of stock award activity

		Unit Weighted Average
	Shares	Grant Date Fair Value
Outstanding shares at January 1, 2022	867,234	$	2.63
Granted	—		—
Exercised	(21,339)	$	2.63
Forfeited	—		—
Outstanding shares at December 31, 2022	845,895	$	2.63
Outstanding shares at January 1, 2021	1,264,410	$	2.63
Granted	—		—
Exercised	(397,176)	$	2.63
Forfeited	—		—
Outstanding shares at December 31, 2021	867,234	$	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, 2022, 2021 and 2020 and the unrecognized compensation expense under this plan were as follows (in millions):

	2022		2021		2020
Stock based compensation expense	$	0.7	$	0.7	$	0.7
Unrecognized compensation expense	$	2.4	$	3.1	$	3.8

Schedule of stock award activity

		Unit Weighted Average
	Shares	Grant Date Fair Value
Outstanding shares at January 1, 2022	3,173,924	$	1.86
Granted	—		—
Exercised	(419,418)	$	1.86
Forfeited	—		—
Outstanding shares at December 31, 2022	2,754,506	$	1.86
Outstanding shares at January 1, 2021	3,918,458	$	1.86
Granted	—		—
Exercised	(744,534)	$	1.86
Forfeited	—		—
Outstanding shares at December 31, 2021	3,173,924	$	1.86