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Mineral Properties (Tables)
12 Months Ended
Dec. 31, 2019
Extractive Industries [Abstract]  
Investment in mineral property
(in thousands)   December 31,  
    2019     2018  
Exploration            
   Lik project (Alaska – US)   $ 15,611     $ 15,611  
   La Promesa (Peru)     6       6  
   Montana Royalty property (US)     -       40  
     Total exploration mineral property   $ 15,617     $ 15,657  
Exploration expense
   

For the year ended

December 31,

 
(in thousands)   2019     2018  
Geologic and field expenses   $ 1,726     $ 1,165  
Administrative     81       89  
  Total exploration expense   $ 1,807     $ 1,254