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COMMITMENTS AND CONTINGENCIES: (Details 2) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
ha
Dec. 31, 2012
Virgen Maria
ha
Dec. 31, 2012
Garcia Ataucuri litigation
plaintiff
Jul. 31, 2012
Minera Krypton Mining Rehabilitation
workers
Dec. 25, 2012
Peruvian operations
Dec. 31, 2012
Peruvian operations
item
Y
Dec. 31, 1992
Peruvian operations
Dec. 31, 1978
Peruvian operations
Dec. 31, 1971
Peruvian operations
Dec. 31, 2012
Peruvian operations
Agreements expiring during 2012
item
Apr. 30, 1996
Peruvian operations
Garcia Ataucuri and Others against SCC's Peruvian Branch
person
Dec. 31, 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                      
Area of mining concession (in hectares) 32,989.64 943.72                        
Percentage of mining concession   2.90%                        
Purchase price of shares paid to former stockholders                         $ 2  
Number of widows of miners who filed the complaint                           3
Percentage of labor unionized           63.00%                
Total Number Of Workers           4,566                
Number of labor unions           8       8        
Number of labor unions represent majority of workers           3                
Number of labor unions at each production area represent majority of workers           1                
Total number of workers at the three major unions           2,202                
Number of labor unions other than majority workers unions           5                
Term of collective bargaining agreement (in years)           3                
Percentage of annual salary increase as per collective bargaining agreement in year 2013           6.50%                
Percentage of annual salary increase as per collective bargaining agreement in year 2014           5.00%                
Percentage of annual salary increase as per collective bargaining agreement in year 2015           5.00%                
Period of illegal work stoppage         2 days