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Mineral Properties (Tables)
 12 Months Ended
Dec. 31, 2013
Notes to Financial Statements  
Properties - Investment in Mineral Properties
(in thousands) December 31,
  2013 2012
Development (United States)    
   Mt. Hamilton $12,059  $9,275 
Exploration    
   Pachuca (Mexico) 20  20 
   La Promesa (Peru) 5  5 
   Norcan (Mexico) 6  6 
   Aconchi (Mexico) 5  5 
   Canta Colorado (Mexico) 3  3 
   Atico (Peru) -   5 
   Cerro Azul (Peru) -   3 
   Jaripo (Mexico) -   5 
     Total exploration   39    52 
     Total mineral property $12,098 $9,327
Properties - Capitalized Development Costs
(in thousands)

Year ended

December 31,

  2013 2012
Development expenditures $    1,854  $ 3,107 
Capitalized interest   726  -    
Property payments 174  325 
Capitalized depreciation 30  22 
  Total capitalized costs $ 2,784  $ 3,454 
Properties - Exploration Expense
 

For the year ended

December 31,

(in thousands) 2013 2012
Geologic and field expenses $311  $1,307 
Administrative 486  378 
Mt. Hamilton exploration -       301 
  Total exploration expense $797  $1,986