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COMMITMENTS AND CONTINGENCIES: - Environmental Costs (Details)
$ in Millions, MXN in Billions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 26, 2016
lawsuit
Sep. 15, 2014
MXN
Sep. 15, 2014
USD ($)
Jun. 30, 2017
lawsuit
item
m³
Mar. 31, 2014
Sep. 30, 2016
lawsuit
Jun. 30, 2017
USD ($)
lawsuit
item
Jun. 30, 2016
USD ($)
Jun. 30, 2015
lawsuit
item
Dec. 31, 2015
USD ($)
lawsuit
item
Dec. 31, 2014
item
m³
Dec. 31, 2011
category
person
Dec. 31, 2016
lawsuit
Environmental costs                          
Environmental capital investment | $             $ 80.3 $ 105.7          
Number of collective action lawsuits                 6        
Number of subsidiaries against which lawsuits were filed | item                 2        
Number of collective action lawsuits dismissed 1               4        
Remaining number of Collective action lawsuits                 2        
Number of civil actions seeking damages                   3     3
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                          
Volume of copper sulfate solution (in cubic meters) | m³                     40,000    
Excess provision reversed on closure of trust | $             $ 10.2            
Estimated total damages | $                   $ 136.4      
Number of civil actions seeking damages       28     28     8      
Buenavista del Cobre, S.A. de C.V | Maximum                          
Environmental costs                          
Amount committed to the Mexican Federal Government to establish a trust   MXN 2 $ 150.0                    
Buenavista del Cobre, S.A. de C.V | Minimum                          
Environmental costs                          
Number of workers to clean the river | item                     1,200    
Peru                          
Environmental costs                          
Environmental capital investment | $             $ 44.5 36.2          
Number of atmospheric basins established that require further attention | item             3            
AQS, new hours | item       24                  
AQS, new micrograms of SO2 | m³       250                  
AQS, old hours | item       24                  
Revised air quality standards for sulfur dioxide as per new environmental regulation (in micrograms per cubic meter) | m³       20                  
AQS, new micrograms of gaseous mercury | m³       2                  
Mean monthly AQS | m³       1.5                  
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                
Mexico                          
Environmental costs                          
Environmental capital investment | $             $ 35.8 $ 69.5          
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  
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           3