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COMMITMENTS AND CONTINGENCIES: (Details 2)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 23, 2015
item
shares
Mar. 31, 2015
item
Aug. 31, 2009
USD ($)
Apr. 30, 1996
person
Mar. 31, 2016
Jun. 30, 2015
item
Dec. 31, 2015
ha
item
item / shares
Dec. 31, 1992
Dec. 31, 1978
Dec. 31, 1971
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%      
Garcia Ataucuri and Others against SCC's Peruvian Branch                    
Litigation Matter                    
Number of former Branch workers   104                
Garcia Ataucuri litigation                    
Litigation Matter                    
Number of plaintiffs involved in lawsuits filed             800      
Number of former Branch workers             216      
Number of SCC's former Branch workers             37      
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%  
Percentage of labor unionized             72.70%      
Total number of workers             4,602      
Number of labor unions             5      
Number of labor unions represent majority of workers             1      
Number of labor unions other than majority workers unions             4      
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      
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                  
Number of labor shares per one investment share 10,000,000                  
Peru | Exploraciones de Concesiones Metalicas S.A.C. ("Excomet")                    
Litigation Matter                    
Purchase price of shares paid to former stockholders | $     $ 2              
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        
Subsequent Event | Peru                    
Litigation Matter                    
Term of collective bargaining agreement         3 years          
Percentage of annual salary increase as per collective bargaining agreement in year 2016         5.00%          
Percentage of annual salary increase as per collective bargaining agreement in year 2017         5.00%          
Percentage of annual salary increase as per collective bargaining agreement in year 2018         5.00%