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COMMITMENTS AND CONTINGENCIES: - Environmental Costs (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Sep. 30, 2016 lawsuit | Jun. 30, 2015 lawsuit item | Sep. 30, 2018 USD ($) lawsuit | Sep. 30, 2017 USD ($) | Dec. 31, 2015 lawsuit item | Dec. 31, 2011 category person | Dec. 31, 2017 lawsuit | Dec. 31, 2016 item
Environmental costs |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  | $ 73.3 | $ 155.6 |  |  |  |
Number of collective action lawsuits |  |  | 6 |  |  |  |  |  |
Number of subsidiaries against which lawsuits were filed | item |  |  | 2 |  |  |  |  |  |
Number of collective action lawsuits dismissed |  |  | 2 |  |  |  |  |  |
Remaining number of lawsuits |  |  | 4 |  |  |  |  |  |
Number of civil actions seeking damages |  |  |  |  |  |  |  | 33 |
Number of constitutional action lawsuits |  |  |  |  |  | 4 |  |  |
Number of subsidiaries to which environmental impact authorizations were granted | item |  |  |  |  |  | 1 |  |  |
Buenavista del Cobre, S.A. de C.V |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |
Number of civil actions seeking damages | item |  |  |  |  |  | 8 |  |  | 3
Peru |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  | 38.0 | 60.5 |  |  |  |
Number of months for identification of contaminated sites and around in facilities | 12 months |  |  |  |  |  |  |  |
Period for preparation of decontamination plan | P30M |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Mexico |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |
Environmental capital investment | $ |  |  |  | $ 35.3 | $ 95.1 |  |  |  |
Number of categories of collective actions | category |  |  |  |  |  |  | 3 |  |
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) | person |  |  |  |  |  |  | 30 |  |
Francisca Garcia Enriquez |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  |  |  |  |  | 2 |  |  |
Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  | 4 |  |  |  |  |  |  |
Norberto Bustamante et al |  |  |  |  |  |  |  |  |
Environmental costs |  |  |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  |  |  | 2 |  |  |  |  |

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