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COMMITMENTS AND CONTINGENCIES: (Details 2)
$ in Millions
 1 Months Ended 3 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
Mar. 31, 2016
PEN
ha
item
plaintiff
item / shares
Dec. 31, 2015
item
Dec. 31, 2012
item
Dec. 31, 2005
item
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              
Number of lawsuits           2              
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              
Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V.                          
Litigation Matter                          
Acquisition percentage   99.999%                      
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           75.00%              
Total number of workers           4,557              
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            
Term of agreement           3 years              
Annual salary increase (as a percent)           5.00%              
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            
Mexico | Mexico Generadora de Energia S. de R.L. ("MGE")                          
Litigation Matter                          
Number of power plants               2 2        
Mexico | Mexico Generadora de Energia S. de R.L. ("MGE") | Controladora de Infraestructura Energetica Mexico, S. A. de C. V.                          
Litigation Matter                          
Acquisition percentage               99.999%