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Mineral Property (Tables)
3 Months Ended
Mar. 31, 2020
Extractive Industries [Abstract]  
Investment in mineral property
(in thousands)   March 31,     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 March 31,  
    2020     2019  
Geologic and field expenses   $ 90     $ 147  
Administrative     23       16  
Total exploration costs   $ 113     $ 163