﻿540 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  tures 
  common 
  in. 
  this 
  mineral. 
  Its 
  optical 
  properties 
  are 
  normal. 
  

   Thin 
  sections 
  across 
  the 
  foliation 
  of 
  the 
  rock 
  give 
  basal 
  sections 
  

   of 
  the 
  sillimanite 
  and 
  excellent 
  biaxial 
  interference 
  figures. 
  

  

  The 
  foot 
  wall 
  has 
  more 
  quartz 
  and 
  contains 
  also 
  microperthite. 
  

   Otherwise 
  it 
  is 
  like 
  the 
  hanging. 
  

  

  The 
  oldest 
  rock 
  of 
  all 
  is 
  a, 
  hornbJendic 
  gneiss 
  on 
  which 
  the 
  

   others 
  rest. 
  It 
  has 
  the 
  general 
  mineralogy 
  of 
  a 
  granite, 
  with 
  

   some 
  variations. 
  It 
  contains 
  quartz, 
  microcline, 
  microperthite, 
  

   brown 
  hornblende, 
  emerald 
  green 
  augite, 
  magnetite 
  and 
  titanite, 
  

   and 
  is 
  a 
  type 
  not 
  infrequently 
  met. 
  It 
  probably 
  belongs 
  in 
  the 
  

   general 
  eruptive 
  series 
  with 
  the 
  Whitehall 
  augite-syenite 
  gneiss. 
  

   It 
  may 
  have 
  preceded 
  the 
  sediments 
  but 
  that 
  is 
  not 
  yet 
  demon- 
  

   strated. 
  At 
  all 
  events 
  it 
  occurs 
  below 
  them. 
  

  

  Above 
  the 
  sillimanite-gneiss 
  lies 
  a 
  quartzite 
  without 
  graphite, 
  

   and 
  the 
  same 
  variety 
  of 
  rock 
  is 
  met 
  just 
  west 
  of 
  Hague 
  village 
  

   and 
  at 
  several 
  points 
  along 
  the 
  road 
  from 
  Hague 
  to 
  the 
  mines. 
  

  

  The 
  graphitic 
  quartzite 
  and 
  its 
  wall-rocks 
  are 
  repeated 
  by 
  

   faulting 
  as 
  shown 
  on 
  the 
  map 
  and 
  section, 
  fig. 
  4. 
  

  

  Series 
  4. 
  The 
  paleozoic 
  rocks 
  occur 
  at 
  but 
  one 
  point 
  and 
  that 
  

   is 
  between 
  Silver 
  bay 
  and 
  Van 
  Buren 
  bay. 
  A 
  drab 
  limestone 
  

   is 
  found 
  which 
  appears 
  to 
  be 
  Calciferous. 
  

  

  Series 
  5. 
  No 
  trap 
  dikes 
  were 
  found. 
  

  

  Series 
  6. 
  Glacial 
  drift 
  is 
  widespread. 
  Striae 
  are 
  occasionally 
  

   discernible. 
  Just 
  north 
  of 
  Sabbathday 
  Point 
  they 
  range 
  N 
  25 
  E. 
  

   A 
  mile 
  west 
  of 
  Swede 
  pond 
  they 
  run 
  N 
  35 
  E. 
  Clay 
  sets 
  up 
  the 
  

   valley 
  of 
  Northwest 
  brook, 
  and 
  reaches 
  the 
  town 
  line 
  of 
  Hague 
  

   although 
  mostly 
  in 
  Bolton. 
  

  

  Economic 
  geology. 
  The 
  graphite 
  mine 
  is 
  the 
  only 
  development 
  of 
  

   the 
  useful 
  minerals 
  of 
  the 
  township. 
  It 
  is 
  mined, 
  crushed 
  and 
  

   stamped 
  in 
  a 
  battery 
  of 
  California 
  stamps 
  and 
  then 
  buddled 
  so 
  

   as 
  to 
  save 
  the 
  lighter 
  portion, 
  while 
  the 
  heavier 
  quartz 
  is 
  

   eliminated 
  in 
  the 
  tailings. 
  When 
  concentrated 
  to 
  about 
  50$ 
  

   graphite, 
  it 
  is 
  taken 
  to 
  Ticonderoga 
  and 
  washed 
  up 
  to 
  a 
  product 
  

   that 
  is 
  suitable 
  for 
  lubricants, 
  but 
  the 
  process 
  is 
  kept 
  secret." 
  

  

  a 
  The 
  graphite 
  mine 
  in 
  Hague 
  has 
  received 
  mention 
  once 
  or 
  twice 
  already 
  in 
  print. 
  

   C. 
  D. 
  Walcott, 
  in 
  the 
  bulletin 
  of 
  the 
  U. 
  S. 
  Geeological 
  survey, 
  no. 
  86, 
  p. 
  391, 
  describes 
  

   it 
  in 
  a 
  single 
  sentence 
  as 
  follows: 
  " 
  A 
  graphite 
  mine 
  in 
  the 
  neighborhood 
  of 
  Hague 
  

   is 
  a 
  layer 
  of 
  very 
  graphitic 
  gneiss, 
  comparable 
  to 
  a 
  coal 
  seam 
  in 
  an 
  ordinary 
  bedded 
  

   succession." 
  See 
  further 
  note 
  with 
  a 
  photoengraving 
  of 
  one 
  of 
  the 
  open 
  cuts, 
  Bull, 
  

   geol. 
  soc. 
  Amer. 
  10:227, 
  pi. 
  22. 
  An 
  anonymous 
  writer 
  in 
  the 
  Engineering 
  and 
  mining 
  

   journal, 
  Aug. 
  24, 
  1889, 
  p. 
  158, 
  under 
  the 
  head 
  of 
  " 
  Vacation 
  notes 
  on 
  northern 
  New 
  

   York," 
  also 
  refers 
  to 
  it. 
  

  

  