﻿84 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

   Production 
  of 
  trap 
  

  

  

  19 
  

  

  07 
  

  

  19 
  

  

  08 
  

  

  

  CUBIC 
  

   YARDS 
  

  

  VALUE 
  

  

  CUBIC 
  

   YARDS 
  

  

  VALUE 
  

  

  Crushed 
  stone 
  for 
  roads 
  .... 
  

   Crushed 
  stone 
  for 
  other 
  pur- 
  

   poses 
  . 
  . 
  

  

  362 
  904 
  

   619 
  550 
  

  

  $349 
  485 
  

  

  589 
  542 
  

   2 
  600 
  

  

  755 
  754 
  

  

  175 
  144 
  

  

  I 
  113 
  

  

  $584 
  837 
  

   138 
  026 
  

  

  Paving 
  blocks 
  etc 
  . 
  . 
  

  

  Other 
  . 
  ... 
  . 
  7 
  . 
  

  

  

  910 
  

  

  

  

  Total 
  

  

  982 
  454 
  

  

  $941 
  627 
  

  

  932 
  on 
  

  

  $723 
  773 
  

  

  

  TALC 
  

  

  Talc 
  deposits, 
  remarkable 
  for 
  their 
  size 
  and 
  character, 
  are 
  found 
  

   in 
  St 
  Lawrence 
  county. 
  They 
  are 
  exploited 
  on 
  a 
  large 
  scale 
  and 
  

   furnish 
  most 
  of 
  the 
  ground 
  talc 
  used 
  in 
  this 
  country, 
  besides 
  a 
  

   considerable 
  quantity 
  for 
  export. 
  The 
  product 
  is 
  commonly 
  sold 
  

   under 
  the 
  name 
  of 
  mineral 
  pulp, 
  which 
  is 
  suggestive 
  of 
  its 
  principal 
  

   application; 
  much 
  of 
  the 
  talc 
  has 
  a 
  fibrous 
  texture 
  that 
  is 
  preserved 
  

   even 
  after 
  fine 
  grinding 
  and 
  this 
  feature 
  makes 
  it 
  particularly 
  

   valuable 
  for 
  incorporation 
  in 
  paper 
  stock. 
  Foliated 
  talc 
  which 
  

   occurs 
  in 
  subordinate 
  quantity, 
  is 
  also 
  produced 
  to 
  some 
  extent 
  by 
  

   the 
  mines. 
  

  

  Features 
  of 
  the 
  occurrence. 
  The 
  supply 
  of 
  fibrous 
  and 
  foliated 
  

   talc 
  is 
  obtained 
  from 
  a 
  single 
  district, 
  in 
  southwestern 
  St 
  Lawrence 
  

   county. 
  Geologically 
  the 
  limits 
  of 
  the 
  district 
  can 
  be 
  quite 
  sharply 
  

   defined. 
  The 
  talc 
  is 
  associated 
  with 
  crystalline^ 
  limestones 
  and 
  

   schists 
  of 
  Grenville 
  age, 
  which 
  occupy 
  a 
  belt 
  some 
  12 
  miles 
  long 
  and 
  

   from 
  I 
  to 
  3 
  miles 
  wide 
  extending 
  in 
  a 
  northeasterly 
  direction 
  

   nearly 
  across 
  the 
  towns 
  of 
  Fowler 
  and 
  Edwards. 
  The 
  belt 
  is 
  in- 
  

   closed 
  by 
  gneisses, 
  largely 
  of 
  granitic 
  and 
  dioritic 
  composition, 
  no 
  

   doubt 
  in 
  part 
  at 
  least 
  of 
  igneous 
  derivation; 
  while 
  dark 
  hornblendic 
  

   gneisses 
  of 
  uncertam 
  origin 
  are 
  not 
  uncommon. 
  A 
  small 
  area 
  of 
  

   the 
  gneisses 
  is 
  included 
  in 
  the 
  central 
  part 
  of 
  the 
  belt 
  with 
  the 
  

   Grenville 
  bordering 
  it 
  on 
  all 
  sides. 
  

  

  The 
  talc 
  deposits 
  occur 
  along 
  minor 
  belts 
  within 
  the 
  limestones 
  

   and 
  tremolite 
  schists. 
  They 
  are 
  locally 
  described 
  as 
  veins, 
  but 
  

   really 
  have 
  nothing 
  in 
  common 
  with 
  them, 
  being 
  beds 
  or 
  layers 
  

   interstratified 
  with 
  the 
  limestones. 
  They 
  have 
  the 
  same 
  strike 
  and 
  

  

  