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STOCKHOLDERS' EQUITY: (Tables) | 6 Months Ended
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Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of activity in treasury stock |
|  | 2011 |  | 2010 |
Southern Copper common shares |  |  |  |  |
Balance as of January 1, |  | $ | 461.0 |  | $ | 460.7 |
Purchase of shares |  | 148.0 |  | 0.4 |
Used for corporate purposes |  | (0.5 | ) | (0.2 | )
Balance as of June 30, |  | 608.5 |  | 460.9 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Balance as of January 1, |  | 161.7 |  | 142.7 |
Other activity, including dividend, interest and currency translation effect |  | 14.3 |  | 9.7 |
Balance as of June 30, |  | 176.0 |  | 152.4 |
Treasury stock balance as of June 30, |  | $ | 784.5 |  | $ | 613.3 |
Schedule of share distributions |
|  | 2011 |  | 2010 |
Southern Copper common shares |  |  |  |  |
Directors’ Stock Award Plan |  | 14,400 |  | 13,200 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Employee stock purchase plan (shares in millions) |  | 3.5 |  | 0.6 |
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 |  | @ $32.87 |  | 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 |  | 5,929,726 |  | 147.5 |
Total second quarter |  |  |  | 4,581,920 |  | 32.32 |  |  |  |  |  | 148.0 |
Total purchased |  |  |  | 38,019,670 |  | $ | 15.92 |  | 38,019,670 |  |  |  | $ | 605.1 |
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 | ) | (13,200 | )
Total shares granted at June 30, |  | (271,200 | ) | (254,400 | )
Remaining shares reserved |  | 328,800 |  | 345,600 |
Employee stock purchase plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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 | %
Schedule of stock-based compensation expense and unrecognized compensation expense |
|  | 2011 |  | 2010 |
Stock based compensation expense |  | $ | 1.1 |  | $ | 1.1 |
Unrecognized compensation expense |  | $ | 7.4 |  | $ | 9.5 |
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 |  | (558,297 | ) | 1.16 |
Outstanding shares at June 30, 2010 |  | 10,998,328 |  | $ | 1.16 |
Outstanding shares at January 1, 2011 |  | 10,920,693 |  | $ | 1.16 |
Granted |  | — |  | — |
Exercised |  | (3,338,992 | ) | 1.16 |
Forfeited |  | (128,986 | ) | 1.16 |
Outstanding shares at June 30, 2011 |  | 7,452,715 |  | $ | 1.16 |
New Employee Stock Purchase Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of stock-based compensation expense and unrecognized compensation expense |
|  | 2011 |  | 2010 |
Stock based compensation expense |  | $ | 0.3 |  | — |
Unrecognized compensation expense |  | $ | 4.0 |  | — |
Schedule of stock award activity of the Employee Stock Purchase Plan |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2011 |  | 3,901,901 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | — |  | — |
Forfeited |  | — |  | — |
Outstanding shares at June 30, 2011 |  | 3,901,901 |  | $ | 2.05 |

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