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Mineral Property (Tables)
 9 Months Ended
Sep. 30, 2014
Notes to Financial Statements  
Investment in Mineral Properties
(in thousands) September 30, December 31,
  2014 2013
Development (United States)    
   Mt. Hamilton $14,025  $12,059 
Exploration    
   Pachuca (Mexico) -  20 
   Norcan (Mexico) 6  6 
   Aconchi (Mexico) 5  5 
   Canta Colorado (Mexico) 3  3 
   La Promesa (Peru) 5  5 
     Total exploration  19    39 
     Total mineral property $14,044  $12,098 
Capitalized Development Costs
(in thousands)

Three months ended

September 30,

Nine months ended

September 30,

  2014 2013 2014 2013
Development expenditures $ 543  $ 601  $ 1,383  $ 1,369 
Capitalized interest 161    184  463    557 
Property payments -    75  100  175 
Capitalized depreciation 4  7  20  23 
  Total capitalized costs $ 708  $ 867  $ 1,966  $ 2,124 
Exploration Expense
(in thousands) Three months ended
 September 30		 Nine months ended
September 30,
  2014 2013 2014 2013
Geologic and field expenses $38  $28  $176  $521 
Administrative 20  48  66  253 
Total exploration costs $58  $ 76  $242  $ 774