﻿l62 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  made 
  from 
  it 
  was 
  highly 
  commended 
  by 
  Professor 
  Emmons. 
  It 
  

   was 
  used 
  without 
  concentration. 
  The 
  so 
  called 
  "iron 
  dam" 
  is 
  a 
  

   dike 
  of 
  ore 
  which 
  cuts 
  across 
  the 
  river 
  back 
  of 
  the 
  Tahawus 
  Club 
  

   in 
  a 
  northeasterly 
  direction. 
  It 
  has 
  a 
  width 
  of 
  10 
  feet 
  or 
  a 
  little 
  

   more, 
  but 
  includes 
  a 
  good 
  deal 
  of 
  feldspar. 
  

  

  Along 
  Calamity 
  brook, 
  beginning 
  a 
  short 
  distance 
  from 
  the 
  

   outlet, 
  ore 
  is 
  exposed 
  for 
  a 
  distance 
  of 
  500 
  or 
  600 
  feet 
  and 
  can 
  be 
  

   traced 
  to 
  the 
  west 
  for 
  several 
  hundred 
  feet. 
  It 
  is 
  mostly 
  a 
  fine 
  

   grained 
  intimate 
  mixture 
  of 
  iron 
  minerals 
  and 
  feldspar, 
  pyroxene 
  

   and 
  garnet. 
  In 
  the 
  leaner 
  phases 
  it 
  is 
  a 
  ferriferous 
  gabbro. 
  It 
  

   would 
  appear 
  that 
  this 
  ore 
  occurrence, 
  as 
  well 
  as 
  others 
  of 
  this 
  type, 
  

   represents 
  an 
  intrusion 
  of 
  a 
  highly 
  ferriferous 
  gabbro 
  in 
  the 
  anortho- 
  

   site. 
  This 
  ore 
  contains 
  considerable 
  pyrite 
  and 
  is 
  consequently 
  

   quite 
  sulfurous. 
  The 
  magnetite 
  is 
  in 
  part 
  concentrated 
  in 
  small 
  

   stringers 
  or 
  veinlets 
  which 
  intersect 
  the 
  gabbro 
  in 
  all 
  directions. 
  

  

  Between 
  the 
  latter 
  locality 
  and 
  Lake 
  Henderson 
  there 
  has 
  been 
  

   uncovered 
  by 
  the 
  exploratory 
  operations 
  conducted 
  during 
  the 
  

   last 
  two 
  years 
  an 
  important 
  ore-bearing 
  area 
  that 
  seems 
  to 
  have 
  

   been 
  overlooked 
  in 
  the 
  earlier 
  investigations. 
  No 
  mention 
  of 
  the 
  

   occurrence 
  is 
  made 
  by 
  Emmons 
  or 
  Kemp. 
  The 
  tract 
  is 
  heavily 
  

   wooded 
  and 
  covered 
  with 
  a 
  stratum 
  of 
  soil 
  and 
  glacial 
  boulders. 
  

   By 
  excavating 
  a 
  line 
  of 
  trenches, 
  ore 
  has 
  been 
  shown 
  to 
  exist 
  in 
  

   practically 
  a 
  continuous 
  body, 
  the 
  bounds 
  of 
  which 
  have 
  not 
  yet 
  

   been 
  determined. 
  The 
  ore 
  ranges 
  from 
  an 
  almost 
  solid 
  mixture 
  of 
  

   magnetite 
  and 
  ilmenite 
  to 
  leaner 
  material 
  in 
  which 
  labradorite 
  

   predominates. 
  The 
  deposit 
  has 
  been 
  tested 
  in 
  several 
  places 
  with 
  

   the 
  diamond 
  drill, 
  of 
  which 
  one 
  of 
  the 
  records 
  is 
  here 
  given. 
  

  

  Feet 
  Inches 
  

  

  Lean 
  ore, 
  consisting 
  of 
  disseminated 
  magnetite 
  with 
  

  

  feldspar 
  and 
  pyroxene 
  19 
  3 
  

  

  Rich 
  ore 
  30 
  6 
  

  

  Rock 
  and 
  lean 
  ore, 
  alternating 
  15 
  .... 
  

  

  Rich 
  ore 
  t,3 
  6 
  

  

  Rock 
  carrying 
  some 
  ore 
  11 
  1 
  

  

  Lean 
  ore 
  12 
  .... 
  

  

  Rock 
  and 
  lean 
  ore 
  8 
  .... 
  

  

  Rich 
  ore 
  alternating 
  with 
  seams 
  of 
  rock 
  10 
  7 
  

  

  Rock 
  5 
  .... 
  

  

  144 
  11 
  

  

  Character 
  of 
  the 
  ores. 
  The 
  difference 
  in 
  character 
  of 
  the 
  Lake 
  

   Sanford 
  ores 
  depending 
  upon 
  their 
  geological 
  associations 
  has 
  

  

  