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Other Assets (Tables)
 6 Months Ended
Jun. 30, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands)  June 30, December 31,
  2013 2012  
Deferred offering costs RMB Loan $420  $518 
Accumulated Mt. Hamilton advance royalty payments 300  300 
Furniture and Fixtures, net of accumulated depreciation   117  143 
Exploration bonds and other assets   105  111 
Total other assets $ 942  $ 1,072