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Other Assets (Tables)
 12 Months Ended
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands) December 31,
  2013 2012  
Deferred offering costs RMB Loan $322  $518 
Accumulated Mt. Hamilton advance royalty payments (1) 600  300 
Furniture and Fixtures, net of accumulated depreciation   95  143 
Exploration bonds and other assets   52  111 
Total other assets $ 1,069  $ 1,072