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Mineral Properties (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Capitalized Investment in Mineral Properties
(in thousands) December 31,
  2017 2016
Exploration    
   Lik project (Alaska – US) $15,611  $  -  
   La Promesa (Peru)   6   6 
   Montana Royalty property (US) 40  40 
     Total exploration mineral property   $15,657    $46 
Exploration Expense
 

For the year ended

December 31,

(in thousands) 2017 2016
Geologic and field expenses $447  $537 
Administrative 252  91 
  Total exploration expense $699  $628