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Mineral Properties (Tables)
 12 Months Ended
Dec. 31, 2012
Notes to Financial Statements  
Investments in Mineral property
(in thousands) December 31,
  2012 2011
Development (United States)    
   Mt. Hamilton $9,275  $8,821 
Exploration    
   Cerro Azul (Peru) 3  3 
   La Promesa (Peru) 5  5 
   Aticio (Peru) 5  5 
   Pachuca (Mexico) 20  20 
   Norcan (Mexico) 6  6 
   Aconchi (Mexico) 5  5 
   Canta Colorado (Mexico) 3  -   
   Jaripo (Mexico) 5  5 
   Excelsior (Peru) -    6 
   Triunfo (Bolivia) -    20 
   Espanola (Bolivia)      -    5 
     Total exploration 52  80 
     Total mineral property $9,327 $8,901 
Exploration Expense
(in thousands) 2012 2011
Geologic and field expenses $1,307  $1,922 
Administrative 378  324 
Mt. Hamilton exploration 301  3,700 
  Total exploration expense $1,986  $5,946