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COMMITTMENTS AND CONTINGENCIES: (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended		19 Months Ended
	Mar. 31, 2010	Sep. 30, 2011 Union categories claimant Year	Sep. 30, 2010	Sep. 30, 2011
Environmental costs
Environmental capital expenditure		$ 9.4	$ 12.5
Peruvian operations.
Environmental costs
Environmental capital expenditure		1.7	5.0
Mexican operations
Environmental costs
Environmental capital expenditure		7.7	7.5
Number of categories of collective actions		3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC)		30
Plant demolition and soil remediation budgeted cost	$ 35.7
Plant demolition and soil cost recognized				18500000

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The amount of environmental remediation costs capitalized during the period. These expenditures may relate to long-lived improvements in operating facilities.

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Represents the minimum number of people claiming injury, to initiate collective action for environmental matters.

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Represents the number of categories of collective actions for environmental matters.

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Costs recognized in the balance sheet and income statement in the period for known or estimated future costs arising from requirements to perform activities to remediate one or more sites.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859

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The total anticipated costs with respect to site restoration or other environmental exit costs that may occur on the sale, disposal, or abandonment of property.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section Y

-Paragraph Question 4



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q4)

-URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751

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