STOCKHOLDERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2020

Share based Compensation Plan

Schedule of activity in treasury stock

Activity in treasury stock in the three-month period ended June 30, 2020 and 2019 is 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)
Balance as of June 30,		2,767.9		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		(7.4)		13.2
Balance as of June 30,		273.6		264.5
Treasury stock balance as of June 30,	$	3,041.5	$	3,032.4

Summary of non-controlling interest activity

The following table presents the non-controlling interest activity for the six months ended June 30, 2020 and 2019 (in millions):

	2020		2019
Balance as of January 1,	$	47.9	$	45.4
Net earnings		2.8		3.0
Dividend paid		(2.6)		(0.1)
Balance as of June 30,	$	48.1	$	48.3

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 six months of 2020 and 2019 and the unrecognized compensation expense under this plan were as follows (in millions):

	2020		2019
Stock based compensation expense	$	0.3	$	0.3
Unrecognized compensation expense	$	1.7	$	2.3

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	(54,221)	$	2.63
Forfeited	—		—
Outstanding shares at June 30, 2020	1,325,513	$	2.63
Outstanding shares at January 1, 2019	1,840,336	$	2.63
Granted	—		—
Exercised	(425,076)	$	2.63
Forfeited	—		—
Outstanding shares at June 30, 2019	1,415,260	$	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 six months ended June 30, 2020 and 2019 and the unrecognized compensation expense under this plan were as follows (in millions):

	2020		2019
Stock based compensation expense	$	0.3	$	0.2
Unrecognized compensation expense	$	4.2	$	3.4

Schedule of stock award activity

	2020		2019
Stock based compensation expense	$	0.3	$	0.2
Unrecognized compensation expense	$	4.2	$	3.4