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STOCKHOLDERS' EQUITY: (Tables)

6 Months Ended

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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