XML 27 R17.htm IDEA: XBRL DOCUMENT v3.7.0.1
Mineral Properties (Tables)
 3 Months Ended
Mar. 31, 2017
Extractive Industries [Abstract]  
Investment in Mineral Properties
(in thousands) March 31, 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
 March 31,
  2017 2016
Geologic and field expenses $22  $76 
Administrative 129  46 
Total exploration costs $ 151  $ 122