﻿202 
  EEPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  No. 
  2. 
  

  

  Per 
  ceat. 
  

  

  Lossat 
  llQo 
  C. 
  (water) 
  - 
  0.33 
  

  

  Caibou, 
  iixed 
  ---- 
  47.60 
  

  

  Volatile 
  combustible 
  matter 
  (by 
  diiference) 
  41.76 
  

  

  Ash 
  10.32 
  

  

  100.00 
  

   Specific 
  gravity 
  : 
  1.38. 
  

  

  Besides 
  these 
  two 
  regions, 
  where 
  the 
  mining 
  of 
  coalis 
  carried 
  on 
  more 
  

   or 
  less 
  systematically, 
  nnmerous 
  outcrops 
  have 
  been 
  observed 
  at 
  a 
  uum- 
  

   ber 
  of 
  localities, 
  and 
  reference 
  to 
  some 
  of 
  them 
  has 
  been 
  made 
  at 
  the 
  

   proper 
  place. 
  No 
  doubt 
  some 
  of 
  them 
  may 
  eventually 
  prove 
  to 
  be 
  of 
  

   value, 
  but 
  the 
  mines 
  already 
  started 
  will 
  be 
  able 
  to 
  supply, 
  for 
  a 
  long 
  

   time, 
  even 
  a 
  rapidly 
  increasing 
  demand. 
  For 
  smelting 
  purposes, 
  the 
  

   coal 
  from 
  Trinidad 
  will 
  answer 
  sufficiently 
  well, 
  while 
  for 
  the 
  manufact- 
  

   ure 
  of 
  gas 
  both 
  Cucharas 
  and 
  Trinidad 
  can 
  furnish 
  desirable 
  material. 
  

   (Joal-mining 
  in 
  both 
  these 
  regions 
  is 
  comparatively 
  cheap, 
  owing 
  to 
  the 
  

   favorable 
  location 
  of 
  the 
  beds 
  and 
  the 
  hard, 
  safe 
  character 
  of 
  both, 
  

   hanging 
  and 
  foot 
  walls. 
  

  

  In 
  order 
  to 
  give 
  a 
  comparison 
  of 
  the 
  coals 
  throughout 
  Colorado, 
  I 
  have 
  

   prepared 
  a 
  table 
  containing 
  all 
  assays 
  and 
  analyses 
  that 
  were 
  available. 
  

   It 
  will 
  be 
  found, 
  upon 
  examination, 
  that 
  one 
  group 
  differs 
  very 
  decidedly 
  

   from 
  the 
  rest. 
  This 
  is 
  the 
  group 
  from 
  the 
  Elk 
  Mountains. 
  In 
  compo- 
  

   sition, 
  the 
  coal 
  from 
  that 
  region 
  closely 
  resembles 
  anthracite, 
  as 
  also 
  in 
  

   its 
  physical 
  character. 
  Dr. 
  A. 
  0. 
  Peale, 
  with 
  reference 
  thereto, 
  says:* 
  

   " 
  The 
  eruption 
  of 
  the 
  trachyte 
  found 
  near 
  the 
  coal 
  first 
  mentioned, 
  prob- 
  

   ably 
  so 
  heated 
  it 
  as 
  to 
  deprive 
  it 
  of 
  the 
  bituminous 
  matter. 
  In 
  some 
  

   instances 
  volcanic 
  dikes 
  have 
  been 
  observed 
  to 
  pase 
  through 
  beds 
  of 
  

   this 
  bituminous 
  coal." 
  In 
  that 
  case 
  the 
  portions 
  immediately 
  adjacent 
  

   were 
  found 
  to 
  show 
  a 
  composition 
  closely 
  resembling 
  that 
  of 
  anthracite. 
  

   We 
  may 
  therefore 
  regard 
  the 
  coal 
  from 
  the 
  Elk 
  Mountains 
  and 
  those 
  

   from 
  the 
  vicinity 
  of 
  the 
  Gunnison 
  not 
  as 
  true 
  anthracite 
  primarily, 
  but 
  

   as 
  a 
  bituminous 
  coal 
  having 
  lost 
  nearly 
  all 
  of 
  its 
  volatile 
  constituents. 
  

  

  3 
  

  

  Locality. 
  

  

  u 
  

  

  "3 
  

  

  a, 
  

  

  m 
  

  

  6 
  

  

  r-l 
  S 
  

   O 
  

  

  o 
  

  

  3 
  

  

  o 
  

   o 
  

  

  m 
  

  

  3 
  . 
  

  

  .=1 
  -. 
  

  

  as 
  

   8| 
  

  

  ° 
  s 
  

   > 
  

  

  

  Analysis 
  made 
  

   'by- 
  

  

  1 
  

  

  Region 
  of 
  the 
  Animas. 
  

  

  1.50 
  

   1. 
  15 
  

   1.29 
  

   1.38 
  

  

  3.20 
  

   6.00 
  

   3.0C 
  

   2. 
  CO 
  

  

  2.70 
  

  

  0.52 
  

   1. 
  CO 
  

   1.06 
  

   0.20 
  

   0.20 
  

   0.84 
  

  

  o.to 
  

  

  1.46 
  

   0.32 
  

  

  58.86 
  

   f,0. 
  72 
  

   C2. 
  20 
  

   ()2. 
  72 
  

  

  59.36 
  

  

  40. 
  06 
  

   53. 
  80 
  

  

  65.ro 
  

  

  49.66 
  

   65. 
  76 
  

   54. 
  10 
  

   40.18 
  

  

  48 
  12 
  

   47.60 
  

  

  31.65 
  

  

  28.48 
  

   31. 
  54 
  

   31.02 
  

  

  24.44 
  

  

  27. 
  56 
  

   27.80 
  

   27.68 
  

   26.94 
  

   20.66 
  

   26.98 
  

   50.32 
  

  

  41.76 
  

   41.76 
  

  

  6.23 
  

   4.80 
  

   3.20 
  

   3.66 
  

  

  13.50 
  

  

  31. 
  86 
  

   17.40 
  

  

  6.26 
  

   23. 
  20 
  

  

  4.32 
  

   18.98 
  

  

  8.70 
  

  

  8.66 
  

   10.32 
  

  

  Endlich. 
  

  

  o 
  

  

  

  Do. 
  

  

  3 
  

  

  

  Do. 
  

  

  4 
  

  

  

  Do. 
  

  

  5 
  

  

  Rio 
  Colorado, 
  Colo. 
  (?) 
  

  

  Loew. 
  

  

  6 
  

  

  Trinidad. 
  

  

  1.36 
  

   1.42 
  

   1.31 
  

   1. 
  53 
  

  

  1.28 
  

   1.28 
  

  

  Endlich. 
  

  

  7 
  

  

  

  Do. 
  

  

  g 
  

  

  

  Do. 
  

  

  9 
  

   10 
  

   11 
  

  

  do 
  

  

  Do. 
  

   Do. 
  

  

  

  ilallett. 
  

  

  12 
  

  

  do 
  

  

  Loew. 
  

  

  13 
  

  

  Cucharas. 
  

  

  1. 
  32 
  

   1.38 
  

  

  Endlich. 
  

  

  14 
  

  

  do 
  

  

  Do. 
  

  

  Report 
  United 
  States 
  Geological 
  Survey 
  1874, 
  p. 
  176. 
  

  

  