﻿68 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  furous 
  magnetite 
  is 
  at 
  all 
  events 
  closely 
  involved 
  with 
  them. 
  

   Crystalline 
  limestones 
  occur 
  abundantly 
  in 
  the 
  225 
  teet 
  or 
  iso^of 
  

   rocks 
  that 
  overlie 
  the 
  Cheever 
  ore 
  body 
  in 
  the 
  deepest 
  part, 
  of 
  its 
  

   basin. 
  The 
  limestones 
  and 
  their 
  associated 
  strata 
  appear 
  on 
  the 
  

   surface, 
  but 
  the 
  wall 
  rock 
  of 
  the 
  ore 
  is 
  a 
  syenitic 
  gneiss 
  of 
  the 
  usual 
  

   mineralogy. 
  The 
  Pilfershire 
  ores 
  occur 
  in 
  almost 
  exactly 
  the 
  same 
  

   relationship. 
  The 
  limestones 
  are 
  near 
  and 
  above 
  but 
  the 
  ore 
  is 
  

   really 
  in 
  a 
  syenitic 
  gneiss. 
  Between 
  the 
  Cheever 
  and 
  the 
  Pilfer- 
  

   shire 
  there 
  intervene 
  nearly 
  2 
  miles 
  of 
  mountainous 
  ridges 
  of 
  

   syenitic 
  gneisses 
  rising 
  a 
  thousand 
  feet 
  above 
  the 
  former, 
  and 
  

   while 
  one 
  may 
  remark 
  the 
  similarity 
  of 
  position, 
  it 
  is 
  rash 
  to 
  go 
  

   further. 
  

  

  The 
  Grenville 
  series 
  is 
  thus 
  closely 
  associated 
  with 
  at 
  least 
  three 
  

   of 
  the 
  ore 
  bodies, 
  but 
  the 
  latter 
  are 
  not 
  actually 
  in 
  undoubted 
  

   sediments. 
  

  

  Description 
  of 
  the 
  mines 
  

  

  Following 
  the 
  map 
  [pi. 
  2] 
  the 
  ore 
  deposits 
  will 
  be 
  briefly 
  outlined 
  

   in 
  order 
  from 
  south 
  to 
  north. 
  

  

  No. 
  1. 
  This 
  pit 
  now 
  abandoned 
  was 
  opened 
  by 
  Butler 
  and 
  

   Gillette 
  and 
  continued 
  under 
  the 
  name 
  of 
  the 
  Essex 
  Mining 
  Co. 
  

   The 
  work 
  was 
  based 
  upon 
  a 
  band 
  of 
  ore 
  now 
  represented 
  by 
  an 
  

   excavation 
  40 
  feet 
  long 
  and 
  8 
  to 
  10 
  feet 
  high, 
  sloping 
  at 
  an 
  angle 
  

   of 
  about 
  6o° 
  and 
  striking 
  approximately 
  n. 
  12 
  w. 
  magnetic. 
  

   The 
  dump 
  alone 
  reveals 
  a 
  rather 
  lean 
  ore 
  with 
  much 
  hornblende 
  

   and 
  feldspar 
  intermingled. 
  The 
  walls 
  are 
  reddish 
  granitic 
  gneiss. 
  

   No 
  analyses 
  of 
  the 
  ore 
  are 
  available 
  nor 
  were 
  any 
  samples 
  taken 
  

   or 
  notes 
  recorded 
  by 
  B. 
  T. 
  Putnam 
  for 
  the 
  Tenth 
  Census. 
  

  

  No. 
  2. 
  Lee 
  mine. 
  This 
  opening 
  is 
  just 
  in 
  the 
  outskirts 
  of 
  Port 
  

   Henry 
  and 
  in 
  a 
  little 
  hillock 
  with 
  abrupt 
  north 
  and 
  east 
  sides 
  

   which 
  rises 
  from 
  a 
  valley 
  covered 
  with 
  sand. 
  The 
  nearest 
  rocks 
  

   both 
  to 
  the 
  east 
  and 
  west 
  are 
  the 
  Grenville 
  limestones 
  and 
  their 
  

   associates, 
  but 
  faults 
  quite 
  certainly 
  intervene 
  between 
  them 
  and 
  

   the 
  mine. 
  Its 
  wall 
  rock 
  is 
  a 
  granitic 
  gneiss, 
  whose 
  dark 
  silicate 
  

   is 
  biotite. 
  It 
  is 
  reddish 
  in 
  color 
  and 
  somewhat 
  different 
  both 
  in 
  

   minerals 
  and 
  appearance 
  from 
  the 
  greenish 
  syenitic 
  wall 
  rocks, 
  

   elsewhere 
  met 
  with 
  the 
  ores. 
  The 
  ore 
  strikes 
  n. 
  20 
  w. 
  and 
  dips 
  

   about 
  1 
  9 
  westward 
  into 
  the 
  hill 
  at 
  the 
  more 
  northern 
  slope, 
  

   but 
  swings 
  around 
  to 
  the 
  southeast 
  and 
  steepens 
  to 
  a 
  30 
  dip 
  

   on 
  the 
  south. 
  B. 
  T. 
  Putnam 
  visited 
  it 
  in 
  1880, 
  for 
  the 
  Tenth 
  

   Census 
  [XV: 
  115], 
  and 
  has 
  left 
  a 
  plan 
  and 
  sections. 
  The 
  mine 
  is 
  

   cut 
  off 
  on 
  the 
  north 
  by 
  a 
  trap 
  dike 
  with 
  an 
  east 
  and 
  west 
  strike. 
  

   The 
  dike 
  can 
  be 
  traced 
  across 
  the 
  hills 
  to 
  the 
  eastward. 
  

  

  