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Other Assets - Other Assets (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Deferred offering costs RMB Loan | $ 420,000 | $ 518,000
Accumulated Mt. Hamilton advance royalty payments | 300,000 | 300,000
Furniture and Fixtures, net of accumulated depreciation | 117,000 | 143,000
Exploration bonds and other assets | 105,000 | 111,000
Total other assets | $ 942,000 | $ 1,072,000

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