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Mineral Properties (Tables)
 12 Months Ended
Dec. 31, 2018
Extractive Industries [Abstract]  
Capitalized Investment in Mineral Properties
(in thousands) December 31,
  2018 2017
Exploration    
   Lik project (Alaska – US) $15,611  $15,611 
   La Promesa (Peru) 6  6 
   Montana Royalty property (US) 40  40 
     Total exploration mineral property   $15,657    $15,657 
Exploration Expense
 

For the year ended

December 31,

(in thousands) 2018 2017
Geologic and field expenses $1,165  $447 
Administrative 89  252 
  Total exploration expense $1,254  $699