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COMMITTMENTS AND CONTINGENCIES: (Details 2) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
Garcia Ataucuri litigation
plaintiff
Jul. 31, 2012
Minera Krypton Mining Rehabilitation
workers
Dec. 31, 1992
Peruvian operations
Dec. 31, 1978
Peruvian operations
Dec. 31, 1971
Peruvian operations
Apr. 30, 1996
Peruvian operations
Garcia Ataucuri and Others against SCC's Peruvian Branch
person
Sep. 30, 2012
Peruvian operations
Garcia Ataucuri and Others against SCC's Peruvian Branch
solesdeoro
Aug. 31, 2009
Peruvian operations
Exploraciones de Concesiones Metalicas S.A.C. ("Excomet")
Feb. 19, 2010
Mexican Operations
Pasta de Conchos Accident
person
Litigation matter                  
Number of former employees who filed the complaint           900      
Number of workers hired   130              
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%          
Damages sought by the plaintiff             38,763,806.80 "labor shares" (acciones laborales) (or 3,876,380,679.65 "soles de oro") to be issued under the former profit sharing law proportionally to each former employee in accordance with the time of employment of such employee with SCC's Branch in Peru, plus dividends    
Face value of one labor share             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 plaintiffs involved in lawsuits filed 800                
Purchase price of shares paid to former stockholders               $ 2  
Number of widows of miners who filed the complaint                 3