﻿ADIRONDACK 
  MAGNETIC 
  IRON 
  ORES 
  11 
  J 
  

  

  lished. 
  The 
  geologic 
  relations 
  are 
  obscured 
  by 
  the 
  heavy 
  drift 
  

   covering 
  the 
  lower 
  slopes 
  of 
  the 
  ridge 
  and 
  the 
  valley 
  floor. 
  The 
  

   results 
  of 
  magnetic 
  surveys 
  and 
  diamond 
  drill 
  tests, 
  so 
  far 
  as 
  they 
  

   can 
  be 
  interpreted, 
  indicate 
  the 
  probable 
  interruption 
  of 
  the 
  

   deposits 
  at 
  a 
  point 
  not 
  much 
  distant 
  from 
  the 
  Burden 
  pit. 
  

  

  Another 
  group 
  of 
  deposits 
  has 
  been 
  shown 
  to 
  occur, 
  though 
  

   completely 
  buried 
  beneath 
  drift, 
  on 
  a 
  low 
  ridge 
  2000 
  feet 
  west 
  of 
  

   the 
  main 
  group 
  and 
  is 
  known 
  as 
  the 
  Phillips 
  vein. 
  Its 
  northern 
  

   extremity 
  lies 
  about 
  2000 
  feet 
  northwest 
  of 
  the 
  Burden 
  while 
  

   its 
  trend 
  is 
  southwest 
  toward 
  the 
  81 
  ore 
  body. 
  It 
  consists 
  of 
  

   two 
  parallel 
  veins 
  which 
  correspond 
  quite 
  closely 
  with 
  the 
  front 
  

   and 
  back 
  veins 
  of 
  the 
  main 
  group 
  and 
  like 
  them 
  have 
  a 
  north- 
  

   westerly 
  dip. 
  Their 
  position 
  and 
  similarity 
  of 
  relations 
  suggest 
  

   the 
  possibility 
  that 
  they 
  are 
  a 
  displaced 
  portion 
  of 
  the 
  main 
  ore 
  

   zone. 
  The 
  existence 
  of 
  a 
  fault 
  with 
  a 
  throw 
  to 
  the 
  northwest 
  

   would 
  explain 
  the 
  sudden 
  termination 
  of 
  the 
  ore 
  near 
  the 
  Burden 
  

   pit 
  and 
  may 
  be 
  considered 
  also 
  not 
  improbable 
  owing 
  to 
  the 
  severe 
  

   dynamic 
  strains 
  to 
  which 
  the 
  strata 
  have 
  been 
  subjected, 
  as 
  mani- 
  

   fested 
  by 
  the 
  folding 
  and 
  by 
  the 
  minor 
  flexures 
  and 
  shearing 
  

   effects 
  that 
  are 
  observable 
  in 
  the 
  adjacent 
  ore 
  bodies 
  and 
  inclosing 
  

   walls. 
  The 
  indicated 
  throw 
  of 
  the 
  fault 
  is 
  a 
  little 
  west 
  of 
  north, 
  

   approximately 
  parallel 
  to 
  the 
  axis 
  of 
  the 
  main 
  fold. 
  

  

  Mining 
  operations 
  are 
  confined 
  at 
  the 
  present 
  time 
  to 
  the 
  southern 
  

   section 
  of 
  the 
  ore 
  zone. 
  In 
  this 
  part 
  there 
  are 
  some 
  20 
  slopes 
  or 
  

   inclined 
  shafts, 
  besides 
  open 
  cast 
  workings, 
  located 
  at 
  intervals 
  

   along 
  the 
  outcrop 
  of 
  the 
  front 
  and 
  back 
  veins. 
  Beginning 
  at 
  the 
  

   southwestern 
  extremity, 
  the 
  first 
  opeaiags 
  01 
  the 
  froat 
  vein 
  are 
  

   the 
  Weston 
  and 
  Haainoai, 
  then 
  follow 
  in 
  orler 
  Nos. 
  1, 
  2, 
  Hall, 
  

   3, 
  4, 
  and 
  so 
  on 
  up 
  to 
  No. 
  16, 
  which 
  is 
  near 
  the 
  old 
  mill. 
  On 
  the 
  

   back 
  vein 
  are 
  the 
  Burden, 
  Cannon 
  and 
  Dicksoa 
  pits. 
  

  

  Most 
  of 
  the 
  ore 
  is 
  now 
  obtained 
  by 
  underground 
  mining 
  in 
  the 
  

   Hall 
  slope 
  and 
  the 
  adjacent 
  slopes 
  3, 
  4 
  and 
  5, 
  and 
  by 
  open-cut 
  

   workings 
  at 
  the 
  Burden 
  and 
  Cannon 
  pits. 
  The 
  deepest 
  working 
  is 
  

   No. 
  4 
  which 
  has 
  be^n 
  carried 
  down 
  to 
  a 
  depth 
  of 
  1400 
  fiet 
  on 
  the 
  

   course 
  of 
  the 
  deposit 
  or 
  about 
  8oo 
  feet 
  vertically. 
  The 
  Hall 
  and 
  

   No. 
  3 
  slopes 
  have 
  reached 
  nearly 
  equal 
  depth. 
  The 
  dip 
  of 
  the 
  

   ore 
  bodies 
  in 
  this 
  section 
  is 
  about 
  45 
  north 
  at 
  the 
  surface 
  but 
  

   gradually 
  flattens 
  dowaward 
  to 
  25 
  or 
  less. 
  

  

  At 
  the 
  Burden 
  and 
  Caanon 
  open 
  cuts 
  the 
  width 
  of 
  the 
  back 
  vein 
  

   is 
  fully 
  150 
  feet 
  measured 
  aloag 
  the 
  surface. 
  In 
  the 
  bottom 
  of 
  the 
  

   Hall 
  slope 
  the 
  horizontal 
  drifts 
  are 
  200 
  feet 
  wide. 
  Such 
  thick- 
  

   nesses 
  are 
  unusual, 
  however, 
  and 
  in 
  the 
  former 
  instance 
  may 
  be 
  

  

  