428         CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   L906,   PART    I. 
of  0.04  to  0.15  mm.  To  separate  such  finely  divided  graphite  from 
the  minerals  associated  with  it  would  require  very  fine  grinding  and, 
although  t he  percentage  of  mica  in  the  schist  is  small,  the  expense  of 
a  clean  separation  of  the  graphite  and  mica  to  form  a  high-grade' 
product  would  be  prohibitive.  The  graphite  is  of  the  variety  knowi 
in  the  trade  as  amorphous  graphite  and  is  suitable  only  for  paint, 
other  coloring  matter,  and  foundry  facings. 
Haulage  from  the  graphite  bed  to  the  Chicago,  Burlington  and 
Quincy  Railroad  at  Ironton,  Wyo.,  costs,  approximately,  $1.25  to 
$1.50  per  ton. 
Under  the  conditions  which  control  the  American  graphite  trade  at 
present,  it  is  exceedingly  improbable  that  these  deposits  can  be 
worked  at  a  profit.  At  some  future  time,  however,  they  may  be  of 
commercial  importance.  This  is  more  particularly  likely  to  be  true 
of  the  bed  in  McCanns  Pass,  which  is  8  to  L0  feel  wide. 
of 
