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Commitments And Contingencies (Details) (USD $)
9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2008
B.D. Goldfields, Ltd.
Cases
Mar. 31, 2012
Genser Power Ghana Limited
Oct. 31, 2007
Riverstone Resources, Inc.
Dec. 31, 2011
Riverstone Resources, Inc.
Oct. 31, 2007
AMI Resources, Inc.
Sep. 30, 2012
Dunkwa Properties
oz
Sep. 30, 2012
Hwini-Butre
May 31, 2009
Hwini-Butre
Sep. 30, 2012
Government of Ghana
Dec. 31, 2003
Minimum
Dunkwa Properties
Sep. 30, 2012
Minimum
Hwini-Butre
oz
Dec. 31, 2003
Maximum
Dunkwa Properties
Dec. 31, 2008
Warrant
Riverstone Resources, Inc.
Mar. 31, 2008
Riverstone Resources, Inc.
Feb. 02, 2012
Sale of Business
Riverstone Resources, Inc.
Sep. 30, 2012
Surety Bond
Golden Star (Wassa) LTD
Jul. 31, 2011
Surety Bond
Golden Star (Wassa) LTD
Jun. 30, 2011
Surety Bond
Golden Star (Wassa) LTD
Sep. 30, 2012
Surety Bond
Golden Star (Bogoso/Prestea) LTD
Jul. 31, 2011
Surety Bond
Letter of Credit
Golden Star (Wassa) LTD
Jun. 30, 2011
Surety Bond
Letter of Credit
Golden Star (Wassa) LTD
Sep. 30, 2012
Surety Bond
Letter of Credit
Golden Star (Bogoso/Prestea) LTD
May 01, 2012
Surety Bond
Letter of Credit
Golden Star (Bogoso/Prestea) LTD
Jul. 31, 2011
Surety Bond
Cash
Golden Star (Wassa) LTD
Sep. 30, 2012
Surety Bond
Cash
Golden Star (Bogoso/Prestea) LTD
Jul. 31, 2011
Surety Bond
Cash
Golden Star (Bogoso/Prestea) LTD
May 01, 2012
Golden Star (Wassa) LTD
Bonds [Member]
Environmental Exit Cost [Line Items]                                                          
Guarantor obligations maximum exposure                                   $ 10,600,000 $ 7,950,000 $ 3,000,000 $ 9,000,000 $ 7,800,000 $ 2,850,000 $ 8,100,000 $ 8,100,000 $ 150,000 $ 900,000 $ 1,700,000 $ 9,600,000
Increase in guarantee obligation maximum exposure                                   2,650,000                      
Production weight not subject to royalty payment               200,000                                          
Royalty (percentage)             2.00%       5.00% 2.00%   3.50%                              
Gold price per ounce                       400   300                              
Additional contingent cash payment                   1,000,000                                      
Ownership position in Obuom property             54.00%                                            
Production and recovery threshold                         1,000,000                                
Threshold period from initial start of production                 5 years                                        
Shares entitled to and subsequently received (shares) 23,676,301 700,000     2,000,000                   2,000,000 2,000,000                          
Gold production percentage             54.00%                                            
Length of exploration period on Goulagou and Rounga properties         4 years                                                
Cash payment for sale of exploration projects                                 6,600,000                        
Riverstone common shares issued as part of sale of exploration rights                                 21,700,000                        
Value of Riverstone shares issued 17,117,000 469,000                             15,800,000                        
Number of lawsuits     2                                                    
Carrying value of underlying properties $ 252,496,000 $ 270,157,000       $ 0                                              
Number of Years Plaintiff Operated Electric Power Plant on Behalf of Golden State Resources       2 years