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  ADIRONDACK 
  MAGNETIC 
  IRON 
  ORES 
  1 
  37 
  

  

  Si0 
  2 
  

  

  A1 
  2 
  3 
  

  

  Fe 
  2 
  3 
  

  

  FeO 
  

  

  CaO 
  

  

  MgO 
  

  

  Na 
  2 
  

  

  K 
  2 
  

  

  PA 
  

  

  MnO 
  

  

  S 
  

  

  99.92 
  

  

  Jayville 
  mines. 
  Jayville 
  is 
  14 
  miles 
  west 
  of 
  Benson 
  Mines 
  and 
  

   29 
  miles 
  by 
  rail 
  from 
  Carthage. 
  With 
  the 
  cessation 
  of 
  mining 
  in 
  

   1888 
  the 
  buildings 
  and 
  machinery 
  were 
  removed 
  and 
  the 
  place 
  has 
  

   since 
  been 
  practically 
  abandoned, 
  leaving 
  only 
  the 
  waste 
  heaps 
  

   and 
  pits 
  as 
  witness 
  to 
  the 
  former 
  activity. 
  The 
  mines 
  were 
  last 
  

   operated 
  by 
  the 
  Magnetic 
  Iron 
  Ore 
  Co., 
  who 
  instituted 
  extensive 
  

   developments 
  in 
  1886. 
  The 
  existence 
  of 
  the 
  larger 
  deposits 
  at 
  

   Benson 
  Mines 
  soon 
  led 
  the 
  company, 
  however, 
  to 
  give 
  up 
  the 
  under- 
  

   taking 
  in 
  favor 
  of 
  that 
  locality. 
  The 
  mines 
  are 
  credited 
  by 
  Smock 
  

   with 
  an 
  output 
  of 
  25,000 
  tons 
  during 
  the 
  last 
  period 
  of 
  operation. 
  

  

  The 
  ore 
  occurrence 
  presents 
  a 
  phase 
  quite 
  dissimilar 
  from 
  that 
  

   at 
  Benson 
  Mines 
  and 
  more 
  like 
  the 
  magnetite 
  deposits 
  on 
  the 
  east 
  

   side 
  of 
  the 
  Adirondacks. 
  There 
  are 
  innumerable 
  shoots, 
  lenses 
  

   and 
  irregular 
  bunches 
  in 
  which 
  the 
  magnetite 
  is 
  found 
  showing 
  

   sharp 
  boundaries 
  in 
  contact 
  with 
  the 
  wall 
  rock. 
  The 
  latter 
  is 
  for 
  

   the 
  most 
  part 
  a 
  hornblende 
  -biotite 
  gneiss 
  of 
  sedimentary 
  appear- 
  

   ance. 
  The 
  horizon 
  of 
  the 
  ore 
  lies 
  close 
  to 
  the 
  contact 
  of 
  the 
  gneiss 
  

   with 
  a 
  red 
  pegmatitic 
  hornblende 
  granite. 
  Outcrops 
  of 
  the 
  granite 
  

   occur 
  to 
  the 
  north 
  and 
  east 
  within 
  short 
  distances 
  where 
  they 
  

   break 
  through 
  and 
  cut 
  off 
  the 
  gneiss 
  area 
  in 
  such 
  a 
  way 
  that 
  their 
  

   intrusive 
  character 
  is 
  plainly 
  evidenced. 
  In 
  some 
  of 
  the 
  openings 
  

   the 
  granite 
  can 
  be 
  seen 
  in 
  immediate 
  contact 
  with 
  the 
  ore. 
  

  

  The 
  openings 
  are 
  on 
  the 
  northeastern 
  and 
  northwestern 
  slopes 
  

   of 
  a 
  low 
  ridge 
  of 
  the 
  gneiss 
  that 
  rises 
  just 
  west 
  of 
  the 
  railroad. 
  The 
  

   pits 
  nearest 
  the 
  station 
  are 
  Hart 
  no. 
  1 
  and 
  no. 
  2, 
  of 
  which 
  the 
  first 
  

   is 
  said 
  to 
  be 
  300 
  feet 
  deep 
  following 
  a 
  shoot 
  20 
  feet 
  wide 
  and 
  10 
  feet 
  

   thick. 
  Hart 
  no. 
  2 
  is 
  much 
  shallower. 
  At 
  the 
  northeastern 
  end 
  

   of 
  the 
  ridge 
  where 
  it 
  curves 
  to 
  the 
  west 
  are 
  the 
  pits 
  called 
  New 
  

  

  