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Mineral Property (Tables)
9 Months Ended
Sep. 30, 2020
Extractive Industries [Abstract]  
Investment in mineral property
(in thousands)   September 30,     December 31,  
    2020     2019  
Exploration            
   Lik project (Alaska – US)   $ 15,611     $ 15,611  
   La Promesa (Peru)     6       6  
     Total exploration mineral property   $ 15,617     $ 15,617  
Exploration expense
(in thousands)   Three months ended September 30,     Nine months ended September 30,  
    2020     2019     2020     2019  
Geologic and field expenses   $ 91     $ 794     $ 204     $ 1,621  
Administrative     21       21       65       59  
Total exploration costs   $ 112     $ 815     $ 269     $ 1,680