﻿200 
  . 
  EEPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  not 
  applicable. 
  Inasmuch, 
  however, 
  as 
  it 
  has 
  been 
  universally 
  applied 
  

   and 
  has 
  giv'en 
  a 
  general 
  name 
  to 
  the 
  formation 
  in 
  which 
  the 
  coal 
  occurs, 
  

   it 
  would 
  not 
  be 
  advisable 
  to 
  attempt 
  any 
  change 
  at 
  present. 
  Regarded 
  

   as 
  a 
  mineral, 
  however, 
  this 
  coal 
  is 
  no 
  lignite. 
  

  

  The 
  Riff'enburg 
  coal 
  furnishes 
  a 
  good 
  coke, 
  an 
  average 
  percentage 
  of 
  

   volatile, 
  combustible 
  matter, 
  and 
  a 
  very 
  light, 
  grey 
  ash. 
  An 
  assay 
  

   made 
  of 
  it 
  gave 
  the 
  following 
  result 
  :* 
  

  

  Eiffenburg 
  tank. 
  

  

  Per 
  cent. 
  

  

  Loss 
  at 
  110^ 
  C. 
  Cwater) 
  0.26 
  

  

  Carbon, 
  fixed.. 
  1 
  65.76 
  

  

  Volatile 
  combustible 
  matter 
  (by 
  difference) 
  29. 
  66 
  

  

  Ash 
  4.32 
  

  

  100. 
  00 
  

   Specific 
  gravity 
  : 
  1.28. 
  

  

  Blum's 
  bank 
  is 
  located 
  a 
  short 
  distance 
  west 
  of 
  the 
  Eiffenburg, 
  and 
  

   shows 
  a 
  vein 
  of 
  11 
  feet 
  thickness. 
  It 
  is 
  the 
  same 
  as 
  tbe 
  latter, 
  hav- 
  

   ing, 
  as 
  might 
  be 
  expected, 
  local 
  variations 
  of 
  thickness. 
  A 
  tunnel 
  has 
  

   been 
  driven 
  in 
  to 
  the 
  distance 
  of 
  60 
  feet, 
  and 
  the 
  quality 
  of 
  the 
  coal 
  is 
  

   very 
  nearly 
  that 
  of 
  the 
  Eiffenburg. 
  At 
  the 
  surface 
  partial 
  decompo- 
  

   sition 
  has 
  increased 
  the 
  relative 
  quantity 
  of 
  ash, 
  but 
  upon 
  reaching 
  the 
  

   fresh 
  portion 
  this 
  is 
  again 
  reduced. 
  An 
  assay 
  made 
  furnished 
  the 
  fol- 
  

  

  ing 
  results 
  : 
  

  

  Blum's 
  hmik. 
  

  

  Per 
  cent. 
  

  

  Loss 
  at 
  110° 
  C. 
  (water) 
  1.00 
  

  

  Carbon, 
  fixed 
  .' 
  • 
  53.80 
  

  

  Volatile 
  combustible 
  matter 
  (by 
  difference) 
  27.80 
  

  

  Ash 
  17.40 
  

  

  100. 
  00 
  

   Specific 
  gravity 
  : 
  1.42. 
  

  

  This 
  coal 
  furnishes 
  a 
  compact 
  hard 
  coke, 
  that 
  may 
  readily 
  be 
  utilized 
  

   for 
  metallurgical 
  purposes. 
  Although 
  the 
  percentage 
  of 
  ash 
  seems 
  large 
  

   in 
  the 
  specimen 
  examined, 
  its 
  character 
  is 
  such 
  as 
  to 
  lead 
  to 
  the 
  infer- 
  

   ence 
  above 
  indicated, 
  that 
  it 
  may 
  be 
  owing 
  to 
  partial 
  decomposition. 
  

  

  Stephen's 
  bank 
  is 
  situated 
  still 
  farther 
  west, 
  on 
  the 
  Santa 
  Fe 
  wagon- 
  

   road. 
  It 
  is 
  the 
  largest 
  of 
  the 
  three 
  mines 
  mentioned. 
  A 
  tunnel 
  250 
  

   fpet 
  in 
  length 
  has 
  been 
  driven 
  in, 
  and 
  several 
  chambers 
  have 
  been 
  cut 
  

   out. 
  At 
  this 
  mine 
  the 
  thickness 
  of 
  the 
  coal-bed 
  is 
  9 
  feet. 
  Some 
  of 
  it 
  

   has 
  been 
  coked 
  at 
  the 
  entrance 
  of 
  the 
  tunnel 
  in 
  an 
  improvised 
  kiln. 
  

   The 
  result 
  was 
  very 
  satisfactory. 
  At 
  Trinidad 
  the 
  coal 
  from 
  this 
  locality 
  

   is 
  used 
  for 
  blacksmithing 
  purposes 
  and 
  answers 
  very 
  well. 
  Two 
  assays 
  

   were 
  made, 
  one 
  of 
  good, 
  the 
  other 
  of 
  very 
  poor 
  coal. 
  

  

  Stephen's 
  hank. 
  

  

  No. 
  1. 
  

  

  Per 
  cent. 
  

  

  Loss 
  at 
  110° 
  C. 
  (water) 
  1.06 
  

  

  Carbon, 
  fixed 
  65.00 
  

  

  Volatile 
  combustible 
  matter 
  (by 
  difference) 
  27. 
  68 
  

  

  Ash 
  6.20 
  

  

  ICO. 
  00 
  

   Specific 
  gravity 
  : 
  1.31 
  

  

  * 
  It 
  must 
  be 
  stated 
  that 
  all 
  the 
  coals, 
  assays 
  of 
  which 
  are 
  given 
  below, 
  bad 
  been 
  

   placed 
  for 
  about 
  a 
  year 
  in 
  a 
  room 
  warmed 
  by. 
  steam 
  radiators. 
  This 
  may, 
  in 
  part, 
  

   account 
  for 
  the 
  low 
  percentages 
  of 
  moisture. 
  

  

  