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Reclamation Bond Deposit (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Surety Bond [Member]
Loss Contingencies [Line Items]      
Amount of bond     $ 4,666,091
Bonding fee, percentage     2.50%
Accrued reclamation deposit     2,300,000
Accrued reclamation deposit, noncurrent     700,000
Accrued reclamation deposit, current 1,350,000    1,400,000
Required cash collateral     2,500,000
Required bond deposit     $ 722,000