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COMMITMENTS AND CONTINGENCIES: (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 0 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2013
item
Mar. 31, 2012
item
Dec. 31, 2011
item
Dec. 31, 2010
item
Mar. 31, 2013
Tia Maria
ha
Mar. 31, 2013
Virgen Maria
ha
Mar. 31, 2013
Garcia Ataucuri litigation
plaintiff
Jul. 31, 2012
Minera Krypton Mining Rehabilitation
workers
Dec. 25, 2012
Peruvian operations
Feb. 28, 2013
Peruvian operations
Mar. 31, 2013
Peruvian operations
item
Dec. 31, 1992
Peruvian operations
Dec. 31, 1978
Peruvian operations
Dec. 31, 1971
Peruvian operations
Mar. 31, 2013
Peruvian operations
Agreements expiring during 2012
item
Apr. 30, 1996
Peruvian operations
Garcia Ataucuri and Others against SCC's Peruvian Branch
person
Mar. 31, 2013
Peruvian operations
Garcia Ataucuri and Others against SCC's Peruvian Branch
laborshares
Mar. 31, 2013
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 3,876,380,679.65    
Face value of one labor share                                 100.00 100.00    
Plaintiffs do not represent the percent of SCC's eligible employees                                 100.00% 100.00%    
Soles de oro equivalent to today's one nuevo sol                                 1,000,000,000 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                     65.00%                  
Total number of workers                     4,574                  
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                     2,229                  
Number of labor unions other than majority workers unions                     5                  
Term of collective bargaining agreement                   3 years                    
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                      
Number of strikes during period 0 0 0 0