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Other Assets (Tables)
 3 Months Ended
Mar. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands)  March 31, December 31,
  2013 2012  
Deferred offering costs RMB Loan $469  $518 
Accumulated Mt. Hamilton advance royalty payments 300  300 
Furniture and Fixtures, net of accumulated depreciation   128  143 
Exploration bonds and other assets   110  111 
Total other assets $ 1,007  $ 1,072