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COMMITTMENTS AND CONTINGENCIES: (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended	15 Months Ended
	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010
Environmental costs
Environmental capital expenditure		$ 4.8	$ 4.8	$ 9.3
Peruvian operations.
Environmental costs
Environmental capital expenditure		1.1	1.1	3.8
Mexican operations
Environmental costs
Environmental capital expenditure		3.7	3.7	5.5
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
Duration for initiative to come into force after the publication in the Official Gazette (in months)		6
Plant demolition and soil remediation budgeted cost	$ 35.7
Plant demolition and soil cost recognized			13,200,000

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 90-8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 25
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=6906153&loc=d3e11660-110855

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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.

+ References

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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