﻿ADIRONDACK 
  MAGNETIC 
  IRON 
  ORES 
  

  

  163 
  

  

  already 
  been 
  noted. 
  The 
  ores 
  which 
  have 
  anorthosite 
  for 
  walls 
  

   are 
  more 
  uniform 
  than 
  the 
  others 
  in 
  their 
  physical 
  appearance 
  and 
  

   mineralogy, 
  and 
  also 
  appear 
  to 
  be 
  somewhat 
  richer 
  in 
  iron. 
  As 
  

   a 
  rule 
  they 
  are 
  coarsely 
  textured; 
  the 
  constituent 
  grains 
  of 
  magne- 
  

   tite 
  have 
  a 
  mean 
  diameter 
  of 
  J 
  to 
  J 
  inch. 
  When 
  free 
  from 
  feldspar 
  

   they 
  can 
  scarcely 
  be 
  distinguished 
  in 
  hand 
  specimens 
  from 
  the 
  

   nontitaniferous 
  magnetites. 
  Variations 
  in 
  granularity 
  can 
  be 
  

   noticed 
  in 
  different 
  parts 
  of 
  the 
  same 
  ore 
  body, 
  but 
  the 
  grain 
  

   seldom 
  approaches 
  the 
  fineness 
  of 
  the 
  ores 
  included 
  by 
  the 
  gabbro. 
  

   With 
  the 
  exception 
  of 
  inclusions 
  of 
  labradorite 
  and 
  occasional 
  

   crystals 
  of 
  pyroxene, 
  they 
  are 
  remarkably 
  pure 
  ores. 
  The 
  ores 
  

   found 
  in 
  the 
  gabbro 
  usually 
  carry 
  these 
  minerals 
  in 
  quantity, 
  as 
  

   well 
  as 
  garnet 
  and 
  small 
  amounts 
  of 
  pyrite 
  and 
  apatite. 
  Their 
  

   texture 
  approaches 
  that 
  of 
  a 
  normal 
  gabbro, 
  owing 
  to 
  the 
  presence 
  

   of 
  the 
  silicates, 
  and 
  they 
  are 
  very 
  dense 
  and 
  tough. 
  

  

  The 
  following 
  analyses 
  furnish 
  particulars 
  as 
  to 
  the 
  chemical 
  

   composition 
  of 
  the 
  ores 
  from 
  the 
  principal 
  deposits. 
  They 
  have 
  

   been 
  obtained 
  from 
  the 
  papers 
  by 
  Kemp 
  and 
  Rossi, 
  except 
  Nos. 
  5 
  

   and 
  1 
  1 
  which 
  have 
  been 
  communicated 
  by 
  Mr 
  W. 
  L. 
  Cumings 
  and 
  

   No. 
  6 
  which 
  was 
  made 
  by 
  Prof. 
  E. 
  W. 
  Morley 
  from 
  a 
  sample 
  gathered 
  

   by 
  the 
  writer. 
  

  

  Sanford 
  deposit 
  

  

  6 
  

   083,4 
  

  

  Fe 
  3 
  4 
  ... 
  

  

  Si0 
  2 
  

  

  Ti0 
  2 
  .... 
  

   Al 
  ... 
  

  

  .. 
  70 
  

  

  1 
  

  

  .. 
  19 
  

  

  . 
  . 
  4 
  

  

  .80 
  

  

  39 
  

  

  •52 
  

  

  .00 
  

   022 
  

   028 
  

  

  7i 
  

  

  1 
  

  

  18 
  

  

  ! 
  

  

  •03 
  

  

  34 
  

   .70 
  

  

  3 
  

  

  70 
  

  

  2 
  

   20 
  

  

  3 
  

  

  73 
  

   46 
  

  

  03 
  

   50 
  

  

  A 
  

   IO 
  

  

  60 
  

  

  87 
  

  

  9 
  1 
  

   53 
  

  

  2 
  V 
  3 
  

  

  p 
  

  

  

  

  s 
  

  

  

  

  

  

  

  

  

  

  

  

  

  Iron 
  

  

  •• 
  5i 
  

  

  3° 
  

  

  5i 
  

  

  44 
  

  

  5i 
  

  

  22 
  

  

  62 
  

  

  65 
  

  

  

  

  

  Mil] 
  pond 
  pit 
  

  

  

  

  

  ci- 
  

  

  2 
  

  

  09 
  

  

  9 
  

  

  45 
  

  

  

  007 
  

  

  

  027 
  

  

  14 
  

  

  63-36 
  

  

  60.5 
  

  

  Fe 
  3 
  4 
  . 
  

   SiCL 
  .. 
  

  

  Ti0 
  2 
  . 
  

   A1 
  2 
  3 
  

   P... 
  

   S.... 
  

  

  87.20 
  

   1 
  .09 
  

  

  io-73 
  

   .44 
  

   nil 
  

   nil 
  

  

  Cheney 
  pit 
  

  

  — 
  » 
  Iron 
  dam 
  

  

  82.37 
  

  

  3-67 
  

  

  I3-38 
  

  

  I.50 
  

  

  .017 
  

  

  .068 
  

  

  9 
  

   73.62 
  

  

  53 
  

   74 
  

   5o 
  

  

  o37 
  

   08 
  

  

  55-64 
  

   9-79 
  

  

  15-77 
  

   7. 
  12 
  

  

  1 
  .00 
  

  

  11 
  

   86.53 
  

  

  25 
  

  

  39 
  

   74 
  

  

  1 
  

   10 
  

  

  96 
  

  

  85 
  

  

  008 
  

  

  009 
  

  

  Iron 
  63.45 
  59.56 
  53.62 
  40.33 
  62.15 
  64.47 
  

  

  Fe 
  2 
  3 
  55.9; 
  FeO 
  27.5. 
  

  

  