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Other Assets (Tables)
 3 Months Ended
Mar. 31, 2021
Other Assets [Abstract]  
Other assets
(in thousands)   March 31,     December 31,  
    2021     2020  
Furniture and fixtures, net of accumulated depreciation   $ 33     $ 34  
Lik project equipment, net of accumulated depreciation     25       30  
Office lease asset     97       7  
Vendetta warrants     46       49  
Exploration bonds and other assets     4       4  
Total other   $ 205     $ 124