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Mineral Property (Tables)
3 Months Ended
Mar. 31, 2021
Extractive Industries [Abstract]  
Investment in mineral property
(in thousands)   March 31,     December 31,  
    2021     2020  
Exploration            
   Lik project (Alaska – US)   $ 15,611     $ 15,611  
   Gold Coin (Arizona – US)     17       17  
     Total exploration mineral property   $ 15,628     $ 15,628  
Exploration expense
(in thousands)   Three months ended March 31,  
    2021     2020  
Geologic and field expenses   $ 125     $ 90  
Administrative     22       23  
Total exploration costs   $ 147     $ 113