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Mineral Properties (Tables)
 3 Months Ended
Mar. 31, 2013
Extractive Industries [Abstract]  
Mineral Investment Mineral Properties
(in thousands) March 31, December 31,
  2013 2012
Development (United States)    
   Mt. Hamilton $9,790  $9,275 
Exploration    
   Pachuca (Mexico) 20  20 
   Norcan (Mexico) 6  6 
   Aconchi (Mexico) 5  5 
   Canta Colorado (Mexico) 3  3 
   Cerro Azul (Peru) 3  3 
   La Promesa (Peru) 5  5 
   Atico (Peru) -    5 
   Jaripo (Mexico) -    5 
     Total exploration  42    52 
     Total mineral property $9,832 $9,327
Mineral Exploration Expense
(in thousands) Three months ended
 March 31,
  2013 2012  
Geologic and field expenses $246  $237 
Administrative 116  118 
Mt. Hamilton exploration and development   -    169 
Total exploration costs $ 362  $ 524