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Mineral Properties (Tables)
 6 Months Ended
Jun. 30, 2014
Notes to Financial Statements  
Investment in Mineral Properties
(in thousands) June 30, December 31,
  2014 2013
Development (United States)    
   Mt. Hamilton $13,317  $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 $13,336  $12,098 
Capitalized Development Costs
(in thousands)

Three months ended

June 30,

Six months ended

June 30,

  2014 2013 2014 2013
Development expenditures $ 355  $ 441  $ 840  $ 768 
Capitalized interest 149  193  302  373 
Property payments 100  100  100  100 
Capitalized depreciation 8  8  16  16 
  Total capitalized costs $ 612  $ 742  $ 1,258  $ 1,257 
Exploration Expense
(in thousands) Three months ended
 June 30		 Six months ended
 June 30,
  2014 2013 2014 2013
Geologic and field expenses $112  $247  $138  $493 
Administrative 24  89  46  205 
Total exploration costs $136  $ 336  $184  $ 698