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COMMITMENTS AND CONTINGENCIES: (Details 2)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2015
item
Mar. 31, 2012
item
May. 31, 2011
item
Aug. 31, 2009
USD ($)
Apr. 30, 1996
person
Jun. 30, 2015
item
Sep. 30, 2015
PEN
ha
item
plaintiff
item / shares
Dec. 31, 1992
Dec. 31, 1978
Dec. 31, 1971
Sep. 23, 2015
shares
Tia Maria                      
Litigation matter                      
Area of mining concession (in hectares) | ha             32,989.64        
Virgen Maria                      
Litigation matter                      
Area of mining concession (in hectares) | ha             943.72        
Percentage of mining concession             2.90%        
Purchase price of shares paid to former stockholders | $       $ 2              
Garcia Ataucuri and Others against SCC's Peruvian Branch                      
Litigation matter                      
Number of former Branch workers 104   216                
Armando Cornejo Flores Against SCC Peruvian Branch former workers                      
Litigation matter                      
Number of former Branch workers   37                  
Garcia Ataucuri litigation                      
Litigation matter                      
Number of plaintiffs involved in lawsuits filed | plaintiff             800        
Peru                      
Litigation matter                      
Statutory participation of mine workers in pre-tax profit (as a percent)               8.00%   10.00%  
Statutory participation of mine workers in pre-tax profit paid in cash (as a percent)               100.00% 4.00% 40.00%  
Statutory participation of mine workers in pre-tax profit received as equity interest of enterprise (as a percent)                   60.00%  
Percentage of pre-tax profits delivered as "labor shares"                 5.50%    
Peru | Garcia Ataucuri and Others against SCC's Peruvian Branch                      
Litigation matter                      
Number of former employees who filed the complaint | person         900            
Damages sought by the plaintiff (includes old soles and labor shares)             38,763,806.80        
Damages sought by the plaintiff | PEN             PEN 3.876380680        
Face value of one labor share | item / shares             100        
Labor shares issued by the Branch (as a percent)             100.00%        
Plaintiffs do not represent the percent of SCC's eligible employees             100.00%        
Soles de oro equivalent to today's one nuevo sol             1,000,000,000        
Number of shares seized as security for damages sought (in shares) | shares                     10,501,857
Peru | Labor Matters                      
Litigation matter                      
Percentage of labor unionized             72.00%        
Total number of workers             4,605        
Number of labor unions             5        
Number of labor unions represent majority of workers           1 1        
Number of labor unions other than majority workers unions           4 4        
Peru | Labor Matters | Ilo and Cuajone                      
Litigation matter                      
Number of labor unions represent majority of workers           2          
Peru | Labor Matters | Toquepala                      
Litigation matter                      
Number of labor unions other than majority workers unions           1