﻿ADIRONDACK 
  MAGNETIC 
  IRON 
  ORES 
  , 
  1 
  35 
  

  

  have 
  been 
  put 
  down 
  somewhere 
  in 
  the 
  vicinity 
  of 
  the 
  pit, 
  though 
  

   their 
  exact 
  location 
  is 
  not 
  now 
  known. 
  

  

  Within 
  the 
  limits 
  of 
  the 
  exposures 
  the 
  ore 
  exhibits 
  much 
  uni- 
  

   formity. 
  This 
  feature 
  is 
  naturally 
  of 
  prime 
  importance 
  to 
  the 
  

   economic 
  working 
  of 
  a 
  low 
  grade 
  body 
  such 
  as 
  the 
  present 
  one. 
  

   Occasional 
  stringers 
  of 
  pegmatite 
  and 
  a 
  fine 
  reddish 
  granite 
  are 
  

   encountered 
  which 
  carry 
  little 
  magnetite, 
  but 
  they 
  have 
  not 
  proved 
  

   a 
  serious 
  obstacle 
  to 
  exploitation. 
  In 
  the 
  previous 
  working, 
  the 
  

   deposit 
  was 
  quarried 
  without 
  leaving 
  any 
  waste 
  and 
  the 
  entire 
  

   output 
  was 
  sent 
  to 
  the 
  mill. 
  

  

  The 
  deposit 
  has 
  apparently 
  undergone 
  little 
  disturbance 
  in 
  the 
  

   way 
  of 
  faulting. 
  A 
  slip 
  seems 
  to 
  have 
  taken 
  place 
  near 
  the 
  hanging 
  

   wall 
  at 
  the 
  pit 
  entrance 
  parallel 
  to 
  the 
  strike 
  of 
  the 
  ore 
  body, 
  but 
  

   it 
  is 
  probably 
  slight, 
  as 
  there 
  is 
  ore 
  showing 
  on 
  both 
  sides 
  with 
  no 
  

   marked 
  brecciation. 
  A 
  thin 
  dike 
  has 
  been 
  intruded 
  along 
  the 
  

   fault 
  fissure. 
  The 
  ore 
  next 
  to 
  the 
  fault 
  has 
  been 
  partially 
  altered 
  

   to 
  martite. 
  

  

  Character 
  of 
  the 
  ore. 
  The 
  minerals 
  accompanying 
  the 
  magnetite 
  

   are 
  quartz, 
  feldspar, 
  garnet, 
  biotite, 
  pyrite 
  and 
  apatite. 
  Quartz 
  

   and 
  feldspar 
  constitute 
  the 
  matrix 
  for 
  the 
  most 
  part, 
  while 
  the 
  

   magnetite 
  functions 
  as 
  a 
  binding 
  material. 
  The 
  feldspar 
  is 
  mainly 
  

   the 
  orthoclase 
  variety. 
  The 
  pyrite 
  and 
  garnet 
  are 
  intimately 
  

   associated 
  with 
  the 
  magnetite, 
  the 
  former 
  occurring 
  as 
  small 
  

   included 
  grains 
  and 
  the 
  latter 
  as 
  rims 
  on 
  the 
  borders 
  of 
  the 
  magne- 
  

   tite 
  particles. 
  From 
  the 
  manner 
  in 
  which 
  the 
  magnetite 
  and 
  pyrite 
  

   are 
  intergrown, 
  it 
  is 
  evident 
  that 
  they 
  have 
  been 
  deposited 
  at 
  the 
  

   same 
  time. 
  The 
  garnet, 
  however, 
  is 
  a 
  later 
  crystallization 
  formed 
  

   by 
  a 
  reaction 
  between 
  the 
  magnetite 
  and 
  the 
  feldspar 
  in 
  which 
  the 
  

   chemical 
  constituents 
  of 
  both 
  have 
  been 
  combined. 
  It 
  is 
  a 
  red 
  

   garnet 
  and 
  responds 
  strongly 
  to 
  tests 
  for 
  manganese. 
  As 
  a 
  rule 
  

   the 
  ore 
  is 
  rather 
  fine 
  grained, 
  though 
  coarser 
  in 
  this 
  respect 
  than 
  

   the 
  country 
  gneiss. 
  Like 
  the 
  latter 
  it 
  shows 
  a 
  gneissoid 
  texture. 
  

   Occasionally 
  the 
  magnetite 
  is 
  segregated 
  in 
  thin 
  bands 
  interleaved 
  

   with 
  the 
  silicates. 
  

  

  The 
  following 
  analyses 
  give 
  details 
  as 
  to 
  the 
  chemical 
  composition 
  

   of 
  the 
  ore. 
  No. 
  i 
  is 
  the 
  result 
  obtained 
  from 
  a 
  sample 
  of 
  the 
  ore 
  

   exposed 
  in 
  the 
  present 
  workings, 
  the 
  sample 
  being 
  made 
  up 
  of 
  

   numerous 
  specimens 
  selected 
  so 
  as 
  to 
  give 
  an 
  average 
  for 
  the 
  entire 
  

   face 
  of 
  the 
  quarry. 
  The 
  sample 
  was 
  gathered 
  and 
  analyzed 
  by 
  

   E. 
  Touceda. 
  No. 
  2 
  represents 
  a 
  sample 
  of 
  concentrates, 
  an 
  average 
  

   of 
  132 
  cars; 
  and 
  No. 
  3 
  a 
  sample 
  of 
  concentrates 
  recently 
  taken 
  

   from 
  a 
  small 
  lot 
  in 
  the 
  storage 
  bin 
  at 
  the 
  mines. 
  

  

  