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COMMITMENTS AND CONTINGENCIES: - Litigation Matters (Details)
$ in Millions
 1 Months Ended 6 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, 2016
PEN
ha
item
plaintiff
item / shares
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           4            
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                        
Percentage of interest acquired   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 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           4,560            
Number of labor unions           5            
Number of labor unions represent majority of workers           1            
Number of labor unions other than majority workers unions           4            
Term of agreement           3 years            
Annual salary increase (as a percent)           5.00%            
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                        
Percentage of interest acquired             99.999%