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Mineral Property (Tables)
6 Months Ended
Jun. 30, 2020
Extractive Industries [Abstract]  
Investment in mineral property
(in thousands)   June 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 June 30,     Six months ended June 30,  
    2020     2019     2020     2019  
Geologic and field expenses   $ 23     $ 680     $ 113     $ 827  
Administrative     21       22       44       38  
Total exploration costs   $ 44     $ 702     $ 157     $ 865