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Mineral Property (Tables)
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Investment in Mineral Properties
(in thousands) September 30, December 31,
  2017 2016
Exploration    
   Lik project (Alaska- US) $15,728  $  -  
   La Promesa (Peru)  6  6 
   Montana Royalty property (US) 40   40 
     Total exploration mineral property  $15,774    $46 
Exploration Expense
(in thousands) Three months ended
September 30,		 Nine months ended
September 30,
  2017 2016 2017 2016
Geologic and field expenses $74  $72  $195  $320 
Administrative 106  60  324  154 
Total exploration costs $ 180  $ 132  $ 519  $ 474