﻿ADIRONDACK 
  MAGNETIC 
  IRON 
  ORES 
  41 
  

  

  The 
  Grenville 
  has 
  been 
  broken 
  up 
  into 
  patches 
  and 
  larger 
  irregu- 
  

   lar 
  areas 
  by 
  granite 
  which 
  has 
  invaded 
  the 
  series 
  from 
  below. 
  

   The 
  granite 
  is 
  more 
  or 
  less 
  gneissoid, 
  but 
  yet 
  has 
  a 
  quite 
  massive 
  

   appearance 
  in 
  contrast 
  with 
  the 
  sedimentary 
  gneisses. 
  It 
  con- 
  

   sists 
  mainly 
  of 
  microcline 
  and 
  quartz, 
  with 
  biotite 
  and 
  magnetite 
  

   as 
  the 
  principal 
  dark 
  minerals. 
  It 
  is 
  of 
  pinkish 
  color. 
  The 
  granite 
  

   frequently 
  cuts 
  across 
  the 
  stratification 
  of 
  the 
  sediments 
  and 
  sends 
  

   off 
  dikes 
  and 
  stringers 
  which 
  penetrate 
  the 
  latter 
  in 
  all 
  directions. 
  

   It 
  is 
  very 
  likely 
  a 
  part 
  of 
  the 
  same 
  mass 
  described 
  as 
  being 
  intrusive 
  

   in 
  the 
  Grenville 
  around 
  Hammondville 
  to 
  which 
  it 
  is 
  very 
  similar 
  

   in 
  its 
  characters. 
  

  

  Vineyard 
  and 
  Butler 
  mines. 
  These 
  mines 
  are 
  located 
  on 
  the 
  

   same 
  deposit. 
  They 
  lie 
  in 
  the 
  narrow 
  valley 
  between 
  Buck 
  moun- 
  

   tain 
  and 
  the 
  next 
  ridge 
  to 
  the 
  west 
  known 
  as 
  Dibble 
  mountain, 
  

   just 
  over 
  the 
  border 
  of 
  Crown 
  Point 
  in 
  Ticonderoga 
  township. 
  

   Their 
  outcrop 
  is 
  2 
  miles 
  distant 
  from 
  and 
  500 
  feet 
  above 
  Lake 
  

   Champlain. 
  

  

  The 
  Vineyard 
  mine 
  was 
  last 
  worked 
  by 
  the 
  Lake 
  Champlain 
  

   Ore 
  & 
  Transportation 
  Co., 
  during 
  the 
  years 
  1887 
  and 
  1888, 
  but 
  it 
  

   had 
  been 
  under 
  operation 
  40 
  years 
  before. 
  Some 
  of 
  the 
  ore 
  was 
  

   used 
  at 
  the 
  Crown 
  Point 
  furnace. 
  The 
  deposit 
  can 
  be 
  traced 
  along 
  

   the 
  outcrop 
  for 
  100 
  rods 
  or 
  more 
  following 
  the 
  highway 
  that 
  leads 
  

   to 
  Crown 
  Point 
  Center. 
  It 
  is 
  inclosed 
  by 
  a 
  laminated 
  black 
  horn- 
  

   blendic 
  gneiss. 
  The 
  strike 
  for 
  most 
  of 
  the 
  distance 
  is 
  a 
  little 
  west 
  

   of 
  north, 
  but 
  on 
  the 
  south 
  end 
  it 
  bends 
  around 
  and 
  becomes 
  east 
  of 
  

   north. 
  The 
  main 
  workings 
  are 
  on 
  the 
  southern 
  portion 
  and 
  con- 
  

   sist 
  of 
  open 
  cuts 
  and 
  shallow 
  pits 
  sunk 
  on 
  the 
  dip 
  which 
  is 
  westerly 
  

   at 
  an 
  angle 
  of 
  40 
  or 
  more 
  as 
  measured 
  near 
  the 
  surface. 
  The 
  

   principal 
  pit 
  has 
  recently 
  been 
  pumped 
  out. 
  It 
  is 
  less 
  than 
  100 
  

   feet 
  deep 
  and 
  shows 
  5 
  feet 
  of 
  ore 
  at 
  the 
  surface 
  which 
  widens 
  to 
  

   nearly 
  15 
  feet 
  at 
  the 
  bottom. 
  

  

  The 
  ore 
  is 
  a 
  fairly 
  rich, 
  coarse 
  magnetite. 
  It 
  contains 
  pyrite 
  in 
  

   variable 
  amount, 
  more 
  abundant 
  toward 
  the 
  walls 
  than 
  in 
  the 
  

   central 
  part. 
  The 
  following 
  analysis 
  by 
  J. 
  B. 
  Britton 
  is 
  quoted 
  

   from 
  Maynard 
  who 
  states 
  that 
  it 
  was 
  made 
  from 
  a 
  sample 
  after 
  

   rejecting 
  the 
  most 
  sulfury 
  portion. 
  

  

  Ir 
  on 
  51.34 
  

  

  Silica 
  21.07 
  

  

  Sulfur 
  1. 
  17 
  

  

  Phosphorus 
  36 
  

  

  Water 
  24 
  

  

  