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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

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