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Subsequent Events (Details) (USD $)
 1 Months Ended 2 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Feb. 29, 2012
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 15, 2013
Subsequent Event [Member]
Feb. 14, 2013
Subsequent Event [Member]
Feb. 14, 2013
Subsequent Event [Member]
Gold Equivalent Ounces on Properties [Member]
Subsequent Event [Line Items]                
Accelerated payment             $ 5,000,000  
Number of gold equivalent ounces               200,000
Proceeds from the issuance of common stock 17,250,000 9,300,000 24,349,203       10,000,000    
Proceeds from the issuance of common stock, net of issuance costs $ 15,300,000 $ 8,300,000       $ 9,800,000    
Shares issued           5,000,000