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Other Assets (Tables)
 6 Months Ended
Jun. 30, 2020
Other Assets [Abstract]  
Other assets
(in thousands)   June 30,     December 31  
    2020     2019  
Furniture and fixtures, net of accumulated depreciation   $ 36     $ 39  
Lik project equipment, net of accumulated depreciation     40       50  
Office lease asset     26       45  
Vendetta warrants     33       21  
Exploration bonds and other assets     4       4  
Total other   $ 139     $ 159