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STOCKHOLDERS' EQUITY: (Tables) | 3 Months Ended
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Mar. 31, 2015
STOCKHOLDERS' EQUITY |
Schedule of activity in treasury stock | Activity in treasury stock in the three- month period ended March 31, 2015 and 2014 is as follows (in millions):
|  | 2015 |  | 2014 |
Southern Copper common shares |  |  |  |  |
Balance as of January 1, |  | $ | 1,693.5 |  | $ | 1,011.0 |
Purchase of shares |  | 370.1 |  | 52.5 |
Balance as of March 31, |  | 2,063.6 |  | 1,063.5 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Balance as of January 1, |  | 207.2 |  | 205.6 |
Other activity, including dividend, interest and currency translation effect |  | (2.9 | ) | 6.3 |
Balance as of March 31, |  | 204.3 |  | 211.9 |
Treasury stock balance as of March 31, |  | $ | 2,267.9 |  | $ | 1,275.4 |
Schedule of share repurchase program activity |
|  |  |  |  |  |  |  | Total Number of |  | Maximum Number |  |  |
|  |  |  |  |  | Average |  | Shares |  | of Shares that May |  |  |
|  |  |  | Total Number |  | Price |  | Purchased as |  | Yet Be Purchased |  |  |
Period |  | of Shares |  | Paid per |  | Part of Publicly |  | Under the Plan |  | Total Cost |
From |  | To |  | Purchased |  | Share |  | Announced Plan |  | @ $29.18 (*) |  | ($ in millions) |
2008 |  | 2012 |  | 46,914,486 |  | $ | 18.72 |  | 46,914,486 |  |  |  | $ | 878.1 |
2013 |  |  |  | 10,245,000 |  | 27.47 |  | 57,159,486 |  |  |  | 281.4 |
2014 |  |  |  | 22,711,428 |  | 30.06 |  | 79,870,914 |  |  |  | 682.8 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |
01/01/15 |  | 01/31/15 |  | 5,927,154 |  | 27.12 |  | 85,798,068 |  |  |  | 160.7 |
02/01/15 |  | 02/28/15 |  | 2,590,076 |  | 29.45 |  | 88,388,144 |  |  |  | 76.3 |
03/01/15 |  | 03/31/15 |  | 4,563,649 |  | 29.16 |  | 92,951,793 |  |  |  | 133.1 |
Total first quarter |  |  |  | 13,080,879 |  | 29.29 |  |  |  |  |  | 370.1 |
|  |  |  |  |  |  |  |  |  | 26,992,079 |  |  |
Total purchased |  |  |  | 92,951,793 |  | $ | 23.80 |  |  |  |  |  | $ | 2,212.4 |
(*) NYSE closing price of SCC common shares at March 31, 2015.
Employee Stock Purchase 2007 Plan |
STOCKHOLDERS' EQUITY |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the first quarter 2015 and 2014 and the unrecognized compensation expense as of March 31, 2015 and 2014 under the Employee Stock Purchase Plan were as follows (in millions):
|  | 2015 |  | 2014 |
Stock based compensation expense |  | $ | — |  | $ | 0.5 |
Unrecognized compensation expense |  | $ | — |  | $ | 1.6 |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2015 |  | 4,298,612 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | — |  | — |
Forfeited |  | (3,660,945 | ) | $ | 1.16 |
Outstanding shares at March 31, 2015 |  | 637,667 |  | $ | 1.16 |
Outstanding shares at January 1, 2014 |  | 4,449,599 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | (40,632 | ) | $ | 1.16 |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2014 |  | 4,408,967 |  | $ | 1.16 |
Employee Stock Purchase 2010 Plan |
STOCKHOLDERS' EQUITY |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the first quarter 2015 and 2014 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2015 |  | 2014 |
Stock based compensation expense |  | $ | 0.1 |  | $ | 0.1 |
Unrecognized compensation expense |  | $ | 2.0 |  | $ | 2.5 |
Schedule of stock award activity | The following table presents the stock award activity of this plan for the three months ended March 31, 2015 and 2014:
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2015 |  | 2,287,891 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | — |  | — |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2015 |  | 2,287,891 |  | $ | 2.05 |
Outstanding shares at January 1, 2014 |  | 3,012,464 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | (249,446 | ) | $ | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at March 31, 2014 |  | 2,763,018 |  | $ | 2.05 |
Employee Stock Purchase 2015 Plan | Voluntary Resignation |
STOCKHOLDERS' EQUITY |
Schedule of percentage deduction from the amount to be paid to the employee on termination of service |
|  | % Deducted |
If the resignation occurs during: |  |  |
1st year after the grant date |  | 90 | %
2nd year after the grant date |  | 80 | %
3rd year after the grant date |  | 70 | %
4th year after the grant date |  | 60 | %
5th year after the grant date |  | 50 | %
6th year after the grant date |  | 40 | %
7th year after the grant date |  | 20 | %
Employee Stock Purchase 2015 Plan | Involuntary Termination |
STOCKHOLDERS' EQUITY |
Schedule of percentage deduction from the amount to be paid to the employee on termination of service |
|  | % Deducted |
If the termination occurs during: |  |  |
1st year after the grant date |  | 100 | %
2nd year after the grant date |  | 95 | %
3rd year after the grant date |  | 90 | %
4th year after the grant date |  | 80 | %
5th year after the grant date |  | 70 | %
6th year after the grant date |  | 60 | %
7th year after the grant date |  | 50 | %

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