weed.]  NOTES    ON    THE    COPPER    MINES    OF    VERMONT.  199 
SUMMARY. 
The  Vermont  copper  belt  contains  three  districts,  Corinth,  Copper- 
•  field,  and  South  Strafford.  The  deposits  occur  along  a  due  north-south 
of  line,  which  corresponds  to  the  general  direction  of  schistosity  of  the 
i,  rocks.  The  rocks  are  micaceous  schists  and  gneisses,  formed  from 
sandstones  and  shales  by  regional  metamorphism.  The  original  bed- 
ding, though  obscure,  is  occasionally  detectable,  and  does  not  cor- 
respond to  the  foliation.  Igneous  intrusions  of  granite  are  common 
in  the  region,  but  not  in  the  immediate  vicinity  of  the  ore  deposits. 
The  ore  bodies  are  lenticular  masses  which  simulate  bedded  deposits, 
since  they  appear  to  conform  to  the  banding  of  the  inclosing  schists. 
At  each  locality  but  one  workable  lens  has  been  found  outcropping, 
and  in  the  deep  mines  the  lens  wedges  out  in  depth,  but  is  found  to 
overlap  the  upper  tapered  end  of  another  lens  in  the  foot-wall  rock. 
The  deposits  have  no  gossan  cap,  the  sulphides  appearing  at  the  sur- 
face. The  ores  consist  of  massive  pyrrhotite,  chalcop37rite,  pyrite,  and 
a  little  sphalerite  mixed  with  varying  amounts  of  quartz,  actinolite, 
and  in  the  leaner  ores  of  garnet  and  biotite.  The  deposits  correspond 
in  character  and  copper  contents  to  the  Ducktown,  Tenn.,  ores,  and 
can  probably  be  as  cheaply  mined  and  treated  as  those  of  that  locality. 
