﻿THE 
  MIXING 
  AND 
  QUARRY 
  INDUSTRY 
  I9O/ 
  5 
  1 
  

  

  ment 
  are 
  recrushed 
  by 
  rolls 
  and 
  reconcentrated 
  on 
  Hartz 
  jigs. 
  

   The 
  slimes 
  are 
  passed 
  over 
  Overstrom 
  tables. 
  The 
  mill 
  has 
  a 
  

   nominal 
  capacity 
  of 
  500 
  tons 
  crude 
  ore 
  a 
  day. 
  

  

  The 
  ore 
  bodies 
  have 
  much 
  similarity 
  of 
  shape 
  and 
  geological 
  

   relations 
  to 
  the 
  magnetites 
  of 
  the 
  western 
  Adirondack's. 
  They 
  

   are 
  of 
  lenticular 
  form 
  with 
  their 
  axes 
  of 
  extension 
  alined 
  parallel 
  

   to 
  the 
  foliation 
  of 
  the 
  wall 
  rock, 
  but 
  often 
  show 
  a 
  pitch 
  across 
  

   the 
  dip. 
  They 
  range 
  up 
  to 
  30 
  feet 
  thick. 
  They 
  occur 
  in 
  over- 
  

   lapping 
  series 
  sometimes 
  closely 
  set 
  and 
  again 
  separated 
  by 
  

   varying 
  thicknesses 
  of 
  the 
  wall 
  rock. 
  The 
  country 
  is 
  a 
  dark 
  

   hornblende-biotite 
  schist 
  belonging 
  to 
  the 
  sedimentary 
  or 
  Gren- 
  

   ville 
  series 
  of 
  Adirondack 
  formations. 
  

  

  The 
  pyrite 
  occurs 
  in 
  coarse 
  particles 
  and 
  aggregates 
  which 
  

   only 
  occasionally 
  show 
  crystal 
  boundaries. 
  The 
  gangue 
  consists 
  

   mainly 
  of 
  vein 
  quartz. 
  Zinc 
  blende 
  is 
  a 
  common 
  accompani- 
  

   ment, 
  and 
  pyrrhotite 
  is 
  encountered 
  at 
  times 
  in 
  considerable 
  

   bodies. 
  Though 
  inclosed 
  by 
  sediments 
  the 
  deposits 
  can 
  scarcely 
  

   be 
  construed 
  as 
  original 
  beds 
  of 
  contemporaneous 
  formation, 
  

   but 
  their 
  genesis 
  probably 
  has 
  been 
  parallel 
  to 
  that 
  of 
  the 
  mag- 
  

   netites 
  found 
  in 
  the 
  Grenville 
  which 
  are 
  always 
  pyritic 
  and 
  not 
  

   rarely 
  richly 
  so. 
  There 
  are 
  no 
  well 
  defined 
  walls, 
  for 
  the 
  

   mineralization 
  extends 
  outward 
  into 
  the 
  schist 
  for 
  some 
  distance 
  

   beyond 
  the 
  limits 
  of 
  the 
  pay 
  ore. 
  The 
  pyrite 
  seems 
  to 
  have 
  

   impregnated 
  and 
  replaced 
  the 
  schist 
  to 
  a 
  great 
  extent, 
  at 
  the 
  

   same 
  time 
  filling 
  small 
  fissures 
  and 
  seams 
  along 
  the 
  bedding 
  

   planes. 
  Its 
  origin 
  is 
  traceable 
  to 
  iron-bearing 
  solutions 
  which 
  

   have 
  circulated 
  through 
  the 
  schist 
  when 
  it 
  was 
  probably 
  at 
  con- 
  

   siderable 
  depth 
  from 
  the 
  surface 
  and 
  perhaps 
  in 
  a 
  less 
  metamor- 
  

   phosed 
  condition. 
  

  

  The 
  crude 
  ore 
  carries 
  about 
  30 
  per 
  cent 
  sulfur. 
  An 
  analysis 
  

   of 
  Stella 
  ore 
  showed 
  the 
  following 
  percentages 
  : 
  

  

  Silica 
  32 
  

  

  Iron 
  32 
  

  

  Sulfur 
  32 
  

  

  Copper 
  * 
  .04 
  

  

  Gold 
  and 
  silver 
  traces 
  

  

  The 
  amount 
  credited 
  to 
  silica 
  probably 
  includes 
  the 
  insoluble 
  

   constituents, 
  such 
  as 
  feldspar, 
  hornblende, 
  biotite 
  and 
  other 
  sili- 
  

   cates 
  of 
  the 
  schist 
  as 
  well 
  as 
  quartz. 
  The 
  pyrite 
  is 
  free 
  from 
  

  

  