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COMMITMENTS AND CONTINGENCIES: (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Peruvian operations | Mar. 31, 2014 Peruvian operations item | Mar. 31, 2013 Peruvian operations | Dec. 31, 2013 Peruvian operations | Apr. 08, 2014 Peruvian operations Subsequent event | Mar. 31, 2014 Peruvian operations Maximum | Mar. 31, 2014 Mexican operations | Mar. 31, 2013 Mexican operations | Dec. 31, 2011 Mexican operations person category
Environmental costs |  |  |  |  |  |  |  |  |  |  |
Environmental capital expenditure | $ 16.2 | $ 12.3 |  | $ 9.8 | $ 1.8 |  |  |  | $ 6.4 | $ 10.5 |
Period required for ambient air monitoring as per environmental regulation |  |  |  |  |  | 12 months |  |  |  |  |
Revised air quality standards for sulfur dioxide as per new environmental regulation (in micrograms per cubic meter) |  |  |  |  |  |  |  | 20 |  |  |
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 |  |  |  |  |  |  |
Number of months for identification of contaminated sites and around in facilities |  |  | 12 months |  |  |  |  |  |  |  |
Period for preparation of decontamination plan |  |  | P24M |  |  |  |  |  |  |  |
Period of extension for preparation of decontamination plan |  |  | 1 year |  |  |  |  |  |  |  |
Number of days in which results of soil confirmation tests are to be presented to authorities |  |  | 30 days |  |  |  |  |  |  |  |
Period within which the plan must be reported to the government |  |  |  |  |  |  | 1 year |  |  |  |
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

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- Definition Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities. + References Reference 1: 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=28360866&loc=d3e11660-110855 + Details
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