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Mineral Property (Tables)
6 Months Ended
Jun. 30, 2019
Extractive Industries [Abstract]  
Investment in Mineral Property
(in thousands) June 30, December 31,
  2019 2018
Exploration    
   Lik project (Alaska – US) $15,611  $15,611 
   La Promesa (Peru)
   Montana Royalty property (US) -   40 
     Total exploration mineral property   $15,617    $15,657 
       
Exploration Expense
(in thousands) Three months ended
 June 30,
Six months ended
 June 30,
  2019 2018 2019 2018
Geologic and field expenses $680  $  21  $827  $  45 
Administrative 22  141  38  297 
Total exploration costs $702  $162  $865  $342