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Other Assets (Tables)
 3 Months Ended
Mar. 31, 2020
Other Assets [Abstract]  
Other assets
(in thousands)   March 31,     December 31  
    2020     2019  
Furniture and fixtures, net of accumulated depreciation   $ 38     $ 39  
Lik project equipment, net of accumulated depreciation     45       50  
Office lease asset     36       45  
Vendetta warrants     13       21  
Exploration bonds and other assets     4       4  
Total other   $ 136     $ 159