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STOCKHOLDERS' EQUITY: (Tables) | 12 Months Ended
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Dec. 31, 2011
STOCKHOLDERS' EQUITY. |
Schedule of activity in treasury stock |
|  | 2011 |  | 2010 |
Southern Copper common shares |  |  |  |  |
Balance as of January 1, |  | $ | 461.0 |  | $ | 460.7 |
Purchase of shares |  | 273.6 |  | 0.5 |
Used for corporate purposes |  | (0.5 | ) | (0.2 | )
Balance as of December 31, |  | 734.1 |  | 461.0 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Balance as of January 1, |  | 161.7 |  | 142.7 |
Other activity, including dividend, interest and currency translation effect |  | 2.0 |  | 19.0 |
Balance as of December 31, |  | 163.7 |  | 161.7 |
Treasury stock balance as of December 31, |  | $ | 897.8 |  | $ | 622.7 |
Schedule of share repurchase program activity |
Period |  | Total Number of Shares |  | Average Price Paid per |  | Total Number of Shares Purchased as Part of Publicly |  | Maximum Number of Shares that May Yet Be Purchased Under the Plan |  | Total Cost ($ in |
From |  | To |  | Purchased |  | Share |  | Announced Plan |  | @ $30.18(1) |  | millions) |
2008: |  |  |  |  |  |  |  |  |  |  |  |  |
08/11/08 |  | 12/31/08 |  | 28,510,150 |  | 13.49 |  | 28,510,150 |  |  |  | $ | 384.7 |
2009: |  |  |  |  |  |  |  |  |  |  |  |  |
01/12/09 |  | 09/30/09 |  | 4,912,000 |  | 14.64 |  | 33,422,150 |  |  |  | 71.9 |
2010: |  |  |  |  |  |  |  |  |  |  |  |  |
05/05/10 |  | 10/14/10 |  | 15,600 |  | 29.69 |  | 33,437,750 |  |  |  | 0.5 |
2011: |  |  |  |  |  |  |  |  |  |  |  |  |
05/01/11 |  | 05/31/11 |  | 14,400 |  | 37.06 |  | 33,452,150 |  |  |  | 0.5 |
06/01/11 |  | 06/30/11 |  | 4,567,520 |  | 32.30 |  | 38,019,670 |  |  |  | 147.5 |
08/03/11 |  | 08/22/11 |  | 2,762,811 |  | 29.63 |  | 40,782,481 |  |  |  | 81.9 |
09/22/11 |  | 09/30/11 |  | 1,069,669 |  | 26.59 |  | 41,852,150 |  |  |  | 28.4 |
10/03/11 |  | 10/21/11 |  | 620,000 |  | 24.73 |  | 42,472,150 |  |  |  | 15.3 |
|  |  |  | 9,034,400 |  | 30.29 |  |  |  |  |  | 273.7 |
Total purchased |  | 42,472,150 |  | 17.20 |  |  |  | 8,922,746 |  | $ | 730.7 |
(2) NYSE price at December 31, 2011
Schedule of activity in Directors' Stock Award Plan |
|  | 2011 |  | 2010 |
Total SCC shares reserved for the plan |  | 600,000 |  | 600,000 |
Total shares granted at January 1, |  | (256,800 | ) | (241,200 | )
Granted in the period |  | (14,400 | ) | (15,600 | )
Total shares granted at December 31, |  | (271,200 | ) | (256,800 | )
Remaining shares reserved |  | 328,800 |  | 343,200 |
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 award activity of the Employee Stock Purchase Plan |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2010 |  | 11,556,625 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | — |  | — |
Forfeited |  | (635,932 | ) | 1.16 |
Outstanding shares at December 31, 2010 |  | 10,920,693 |  | $ | 1.16 |
Outstanding shares at January 1, 2011 |  | 10,920,693 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | (3,402,855 | ) | 1.16 |
Forfeited |  | (247,497 | ) | 1.16 |
Outstanding shares at December 31, 2011 |  | 7,270,341 |  | $ | 1.16 |
New Employee Stock Purchase Plan |
Share based compensation plan |
Schedule of stock-based compensation expense and unrecognized compensation expense |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2011 |  | 3,901,901 |  | $ | 2.05 |
Granted |  | 51,923 |  | 2.05 |
Exercised |  | — |  | — |
Forfeited |  | (146,678 | ) | 2.05 |
Outstanding shares at December 31, 2011 |  | 3,807,146 |  | $ | 2.05 |

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