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This may not be exactly what you are looking for, but it point you in the
right direction.  It is "Online Resources for Earth Scientists", a very
comprehensive listing of sources.  I hope it is useful.
 
On Netscape or Mosaic, open the following URL:
 
ftp://ftp.csn.org/COGS/ores.txt.
 
Good Luck :)
 
P. Andrew Ray
Department of Geography
University of Western Ontario