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Mineral Property (Tables)
 6 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Abstract]  
Investment in Mineral Properties
(in thousands) June 30, December 31,
  2017 2016
Exploration    
   La Promesa (Peru) $ 6  $  6 
   Montana Royalty property (US) 40   40 
     Total exploration mineral property  $46    $46 
Exploration Expense
(in thousands) Three months ended
June 30,		 Six months ended
June 30,
  2017 2016 2017 2016
Geologic and field expenses $99  $172  $121  $248 
Administrative 89  48  218  94 
Total exploration costs $ 188  $ 220  $ 339  $ 342