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Mineral Property (Tables)
9 Months Ended
Sep. 30, 2019
Extractive Industries [Abstract]  
Investment in mineral property
(in thousands)   September 30,     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
(in thousands)   Three months ended September 30,     Nine months ended September 30,  
    2019     2018     2019     2018  
Geologic and field expenses   $ 794     $ 322     $ 1,621     $ 619  
Administrative     21       22       59       67  
Total exploration costs   $ 815     $ 344     $ 1,680     $ 686