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Marketable Securities
6 Months Ended
Jun. 30, 2011
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
5.           Marketable Securities

   
At June 30, 2011
  
At December 31, 2010
 
   
Cost
  
Unrealized gain
  
Fair value
  
Cost
  
Unrealized gain
  
Fair value
 
                    
 Esperanza Silver Corp.
  10   125   135   10   203   213 
 Black Isle Resources
  50   1   51   50   13   63 
 Nevgold Resources Corp.
  87   124   211   87   205   292 
 Sprott Resources Corp.
  120   70   190   220   150   370 
 Canadian Phoenix
  99   11   110   99   12   111 
 Other
  407   25   432   308   346   654 
   $773  $356  $1,129  $774  $929  $1,703