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COMMITTMENTS AND CONTINGENCIES: (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 22 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2011 person category | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Environmental costs |  |  |  |
Environmental capital expenditure | $ 13.9 | $ 13.9 | $ 16.6 | $ 27.5
Peru |  |  |  |
Environmental costs |  |  |  |
Environmental capital expenditure | 2.4 | 2.4 | 6.4 | 2.4
Mexican Operations. |  |  |  |
Environmental costs |  |  |  |
Environmental capital expenditure | 11.5 | 11.5 | 10.2 | 25.1
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 |  | $ 22.5 |  |

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- Definition 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-Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 90-8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 + Details
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- Definition 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 + Details
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