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COMMITMENTS AND CONTINGENCIES: (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 46 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 category person | Dec. 31, 2013
Environmental costs |  |  |  |
Environmental capital expenditure | $ 60.7 | $ 27.4 | $ 14.0 |
Peruvian operations |  |  |  |
Environmental costs |  |  |  |
Environmental capital expenditure | 20.9 | 6.7 | 2.5 |
Period required for ambient air monitoring as per environmental regulation | 12 months |  |  |
Air quality standards level for sulfur dioxide to be maintained when emission is excess than specified as per new environmental regulation (in micrograms per cubic meter) | 80 |  |  |
Number of atmospheric basins established that require further attention | 3 |  |  |
Period for the soil decontamination plan, as a result of any contamination being identified | 3 years |  |  |
Number of months after the issuance of the regulations to update approved environmental programs to comply with the requirements of the rule | 12 months |  |  |
Peruvian operations | Maximum |  |  |  |
Environmental costs |  |  |  |
Revised air quality standards for sulfur dioxide as per new environmental regulation (in micrograms per cubic meter) | 20 |  |  |
Mexican operations |  |  |  |
Environmental costs |  |  |  |
Environmental capital expenditure | 39.8 | 20.7 | 11.5 |
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 |  |  |  | 62.4
Plant demolition and soil cost recognized |  |  |  | $ 35.7

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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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 4 + Details
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