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Commitments And Contingencies (Details)
6 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 0 Months Ended
Jun. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2008
B.D. Goldfields, Ltd.
Cases
Mar. 31, 2012
Genser Power Ghana Limited
Oct. 31, 2007
Goulagou and Rounga
Feb. 29, 2012
Riverstone Resources, Inc.
USD ($)
Oct. 31, 2007
Riverstone Resources, Inc.
CAD
Dec. 31, 2008
Riverstone Resources, Inc.
USD ($)
Jun. 30, 2012
Riverstone Resources, Inc.
USD ($)
Dec. 31, 2011
Riverstone Resources, Inc.
USD ($)
Oct. 31, 2007
Riverstone Resources, Inc.
USD ($)
Oct. 31, 2007
AMI Resources, Inc.
Jun. 30, 2012
Dunkwa Properties
oz
Jun. 30, 2012
Hwini-Butre
May 31, 2009
Hwini-Butre
USD ($)
Jun. 30, 2012
Government of Ghana
Dec. 31, 2003
Minimum
Dunkwa Properties
Jun. 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.
USD ($)
Jun. 30, 2012
Surety Bond
Golden Star (Wassa) LTD
USD ($)
Jul. 31, 2011
Surety Bond
Golden Star (Wassa) LTD
USD ($)
Jun. 30, 2011
Surety Bond
Golden Star (Wassa) LTD
USD ($)
Jun. 30, 2012
Surety Bond
Golden Star (Bogoso/Prestea) LTD
USD ($)
Jul. 31, 2011
Surety Bond
Letter of Credit
Golden Star (Wassa) LTD
USD ($)
Jun. 30, 2011
Surety Bond
Letter of Credit
Golden Star (Wassa) LTD
USD ($)
Jun. 30, 2012
Surety Bond
Letter of Credit
Golden Star (Bogoso/Prestea) LTD
USD ($)
May 01, 2012
Surety Bond
Letter of Credit
Golden Star (Bogoso/Prestea) LTD
USD ($)
Jul. 31, 2011
Surety Bond
Cash
Golden Star (Wassa) LTD
USD ($)
Jun. 30, 2012
Surety Bond
Cash
Golden Star (Bogoso/Prestea) LTD
USD ($)
Jul. 31, 2011
Surety Bond
Cash
Golden Star (Bogoso/Prestea) LTD
USD ($)
May 01, 2012
Golden Star (Wassa) LTD
Bonds [Member]
USD ($)
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         90.00%             54.00%                                            
Spending required of Riverstone to exercise options             4,000,000                                                      
Potential purchase price of interest in property if options exercised                     18,600,000                                              
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                                                      
Warrants exercise price               $ 0.45                                                    
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                        
Gain recognized on completion of disposition           22,400,000                                                        
Number of lawsuits     2                                                              
Carrying value of underlying properties 259,350,000 270,157,000               0                                                
Number of Years Plaintiff Operated Electric Power Plant on Behalf of Golden State Resources       2 years                                                            
Unrealized Loss on Securities           7,600,000                                                        
Common Stock, Value, Outstanding                 $ 8,200,000