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Commitments And Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Oct. 31, 2007
AMI Resources, Inc.
Dec. 31, 2012
Dunkwa Properties
oz
Dec. 31, 2012
Hwini-Butre
May 31, 2009
Hwini-Butre
Dec. 31, 2012
Government of Ghana
Dec. 31, 2003
Minimum
Dunkwa Properties
Dec. 31, 2012
Minimum
Hwini-Butre
oz
Dec. 31, 2003
Maximum
Dunkwa Properties
Dec. 31, 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
Dec. 31, 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
Dec. 31, 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
Dec. 31, 2012
Surety Bond
Cash
Golden Star (Bogoso/Prestea) LTD
Jul. 31, 2011
Surety Bond
Cash
Golden Star (Bogoso/Prestea) LTD
May 01, 2012
Bonds
Golden Star (Wassa) LTD
Environmental Exit Cost [Line Items]                                        
Guarantor obligations maximum exposure                 $ 10.60 $ 7.95 $ 3.00 $ 9.00 $ 7.80 $ 2.85 $ 8.10 $ 8.10 $ 0.15 $ 0.90 $ 1.70 $ 9.60
Increase in guarantee obligation maximum exposure                 2.65                      
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       $ 1.0                                
Purchase Agreement Production Threshold             1,000,000                          
Purchase Agreement Production Threshold, Period From Start of Production     5 years                                  
Ownership position in Obuom property 54.00%                                      
Gold production percentage 54.00%