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Other Assets (Tables)
6 Months Ended
Jun. 30, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands)  June 30, December 31,
  2014 2013  
Deferred offering costs RMB Loan $224  $322 
Accumulated Mt. Hamilton advance royalty payments 600  600 
Furniture and Fixtures, net of accumulated depreciation   72  95 
Exploration bonds and other assets   42  52 
Total other assets $ 938  $ 1,069