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COMMITMENTS AND CONTINGENCIES: (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 0 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Apr. 08, 2014
Peruvian operations
Mar. 31, 2014
Peruvian operations
Jun. 30, 2014
Peruvian operations
item
Jun. 30, 2013
Peruvian operations
Dec. 31, 2013
Peruvian operations
Jun. 30, 2014
Peruvian operations
Maximum
Jun. 30, 2014
Mexican operations
Jun. 30, 2013
Mexican operations
Dec. 31, 2011
Mexican operations
person
category
Environmental costs                      
Environmental capital expenditure $ 65.3 $ 53.6     $ 57.6 $ 32.4     $ 7.7 $ 21.2  
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       24 months              
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