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Mineral Property (Tables)
 6 Months Ended
Jun. 30, 2018
Extractive Industries [Abstract]  
Capitalized Investment in Mineral Property
(in thousands) June 30, 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
(in thousands) Three months ended
 June 30,		 Six months ended
 June 30,
  2018 2017 2018 2017
Geologic and field expenses $21  $99  $45  $121 
Administrative 141  89  297  218 
Total exploration costs $162  $188  $342  $339