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STOCKHOLDERS' EQUITY: (Tables) | 3 Months Ended
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Mar. 31, 2013
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock | Activity in treasury stock in the three-month period ended March 31, 2013 and 2012 is as follows (in millions):
|  | 2013 |  | 2012 |
Southern Copper common shares |  |  |  |  |
Balance as of January 1, |  | $ | 729.8 |  | $ | 734.1 |
Purchase of shares |  |  |  |  |
Stock dividend |  | — |  | (151.4 | )
Balance as of March 31, |  | 729.8 |  | 582.7 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Balance as of January 1, |  | 189.0 |  | 163.7 |
Other activity, including dividend, interest and currency translation effect |  | 12.4 |  | 13.7 |
Balance as of March 31, |  | 201.4 |  | 177.4 |
Treasury stock balance as of March 31, |  | $ | 931.2 |  | $ | 760.1 |
Deduction from the amount to be paid to the employee in case of voluntary resignation |
If the resignation occurs during: |  | % Deducted |
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 | %
Deduction from the amount to be paid to the employee in case of involuntary termination |
If the termination occurs during: |  | % Deducted |
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 | %
Employee Stock Purchase Plan |
Share based compensation plan |
Schedule of stock-based compensation expense and unrecognized compensation expense | The stock based compensation expense for the first quarter 2013 and 2012, under the Employee Stock Purchase Plan and the unrecognized compensation expense as of March 31, 2013 and 2012 under this plan were as follows (in million):
|  | 2013 |  | 2012 |
Stock based compensation expense |  | $ | 0.5 |  | $ | 0.5 |
Unrecognized compensation expense |  | $ | 3.7 |  | $ | 5.9 |
Schedule of stock award activity of the Employee Stock Purchase Plan |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2013 |  | 6,955,572 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | (2,349,157 | ) | $ | 1.16 |
Forfeited |  | (29,639 | ) | $ | 1.16 |
Outstanding shares at March 31, 2013 |  | 4,576,776 |  | $ | 1.16 |
Outstanding shares at January 1, 2012 |  | 7,270,341 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | (36,303 | ) | $ | 1.16 |
Forfeited |  | (90,204 | ) | $ | 1.16 |
Outstanding shares at March 31, 2012 |  | 7,143,834 |  | $ | 1.16 |
New Employee Stock Purchase Plan |
Share based compensation plan |
Schedule of stock-based compensation expense and unrecognized compensation expense | The stock based compensation expense for the first quarter 2013 and 2012, under the New Employee Stock Purchase Plan and the unrecognized compensation expense as of March 31, 2013 and 2012 under this plan were as follows (in million):
|  | 2013 |  | 2012 |
Stock based compensation expense |  | $ | 0.1 |  | $ | 0.1 |
Unrecognized compensation expense |  | $ | 3.0 |  | $ | 3.7 |
Schedule of stock award activity of the Employee Stock Purchase Plan |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2013 |  | 2,944,742 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | — |  | — |
Forfeited |  | (22,638 | ) | $ | 2.05 |
Outstanding shares at March 31, 2013 |  | 2,922,104 |  | $ | 2.05 |
Outstanding shares at January 1, 201 2 |  | 3,807,146 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | (636,945 | ) | $ | 2.05 |
Forfeited |  | (51,675 | ) | $ | 2.05 |
Outstanding shares at March 31, 201 2 |  | 3,118,526 |  | $ | 2.05 |

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- Definition Tabular disclosure of an entity's treasury stock, including the average cost per share, carrying basis for each class of treasury stock, description of share repurchase program authorized by an entity's board of directors, the number of shares repurchased, the cost of the shares repurchased, the remaining maximum dollar value of shares available for repurchase under the program, the treatment of the purchase price in excess of the current market value, number of shares held for each class of treasury stock, and other information necessary to a fair presentation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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