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Other Assets (Tables)
3 Months Ended
Mar. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands)  March 31, December 31,
  2015 2014
Deferred offering costs RMB Loan $  77  $126 
Accumulated Mt. Hamilton advance royalty payments 900  900 
Furniture and Fixtures, net of accumulated depreciation   58    63 
Exploration bonds and other assets   73    74 
Total other assets $ 1,108  $ 1,163