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Commitments And Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Oct. 31, 2007
AMI Resources, Inc.
Mar. 31, 2013
Dunkwa Properties
oz
Mar. 31, 2013
Hwini-Butre
May 31, 2009
Hwini-Butre
Mar. 31, 2013
Government of Ghana
Dec. 31, 2003
Minimum
Dunkwa Properties
Mar. 31, 2013
Minimum
Hwini-Butre
oz
Dec. 31, 2003
Maximum
Dunkwa Properties
Mar. 31, 2013
Surety Bond
Golden Star (Bogoso/Prestea) LTD
Mar. 31, 2013
Surety Bond
Golden Star (Wassa) LTD
Mar. 31, 2013
Surety Bond
Letter of Credit
Golden Star (Bogoso/Prestea) LTD
May 01, 2012
Surety Bond
Letter of Credit
Golden Star (Bogoso/Prestea) LTD
Mar. 31, 2013
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]                              
Purchase Agreement Production Threshold             1,000,000                
Purchase Agreement Production Threshold, Period From Start of Production     5 years                        
Guarantor obligations maximum exposure                 $ 9.0 $ 10.6 $ 8.1 $ 8.1 $ 0.9 $ 1.7 $ 9.6
Increase in guarantee obligation maximum exposure                   2.7          
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                      
Ownership position in Obuom property 54.00%                            
Gold production percentage 54.00%