GBEAT   DIVIDE   BASIN    COAL  FIELD,    WYOMING. 
237 
even  fracture  of  any  kind.  Blocks  of  coal  taken  in  1 905  from  one  of 
the  mines  in  T.  27  N.,  R.  89  W.,  and  kept  in  a  shed  with  open  windows 
were  examined  by  the  writer  in  October,  1907.  They  were  large  and 
firm,  but  the  surface  of  the  coal  had  lost  its  luster  and  was  in  places 
slightly  checked.  The  specific  gravity  of  the  coal  was  considerably 
less  than  that  of  fresh  coal  from  the  same  mine. 
CHEMICAL    PROPERTIES. 
On  account  of  the  slight  amount  of  development  within  this  field, 
it  was  not  possible  to  obtain  good  representative  samples  of  the  coal 
for  chemical  analysis.  Only  six  samples  a  were  taken,  and  but  one 
of  these  was  obtained  from  a  fresh  working  face.  All  these  samples 
were  collected  near  weathered  surfaces  and  were  probably  more  or 
less  altered.  A  comparison  of  the  coals  of  the  same  geologic  age  in 
the  surrounding  regions,  where  actual  mining  is  being  carried  on 
and  where  good  representative  samples  have  been  collected,  shows 
the  probable  quality  and  character  of  the  coals  of  this  field.  The 
analyses  in  the  following  table  represent  samples  collected  by  A.  C. 
Veatch  in  east-central  Carbon  County  and  by  the  writer  in  the  field 
covered  by  this  report: 
Analyses  of  coal  samples  from  the  Great  Divide  Basin  and  adjacent  coalfields,  Wyoming. 
[F.  M.  Stanton,  chemist  in  charge.] 
Geoloj 
fie  formation 
Mesaverde. 
Laramie. 
No.  or 
PL  XII 
37. 
35. 
26. 
Labor 
6  3921. 
6  3925. 
5816. 
5818. 
5826. 
63790. 
b  3548. 
Sampl 
e  as  received: 
Moisture 
13.  54 
32.01 
48.34 
6.11 
.50 
14.04 
33.79 
45.58 
6.59 
.40 
23.60 
44.30 
28.00 
4.10 
.29 
5.95 
53.60 
.86 
35.  20 
5,013 
9,023 
18.98 
34.15 
40.22 
6.65 
.51 
5.87 
53.58 
.87 
32.52 
5,074 
9,133 
40.58 
26.51 
30.21 
2.70 
.30 
6.50 
37.38 
.94 
52.18 
3,213 
5,783 
13.06 
35.11 
48.86 
2.97 
1.10 
5.52 
61.72 
1.38 
27.31 
6,041 
10,874 
10.96 
M 
Volatile  matter 
38.04 
" 
48.59 
h 
fAsh 
2.41 
I  Sulphur 
.29 
Hydrogen 
5.37 
+3, 
Carbon 
62.25 
P 
Nitrogen 
1.59 
Oxygen 
28.09 
Ca 
Bi 
lories 
5,902 
10,624 
Loss  of  moisture  on  air  drying 
7.00 
5.20 
8.30 
7.10 
26.80 
3.70 
.80 
Air-dr 
ied  sample: 
Moisture 
7.03 
34.42 
51.98 
6.57 
.54 
9.33 
35.64 
48.08 
6.95 
.42 
16.68 
48.31 
30.54 
4.47 
.32 
5.49 
58.45 
.94 
30.33 
5,467 
9,840 
12.79 
36.76 
43.29 
7.16 
.55 
5.47 
57.67 
.94 
28.21 
5,462 
9,831 
18.82 
36.22 
41.27 
3.69 
.41 
4.78 
51.07 
1.28 
38.77 
4,389 
7,900 
9.72 
36.  .Ki 
50.74 
3.08 
1.14 
5.31 
64.09 
1.43 
24.95 
6,273 
11,292 
10.24 
* 
Volatile  matter 
38.35 
- 
Fixed  carbon 
48.98 
Hh 
(Ash 
2.43 
.29 
5.32 
4*. 
Carbon 
62.75 
£ 
Nitrogen 
1.61 
27.60 
Ci 
Bi 
Thick 
lories 
5,950 
•itish  thermal  units 
10,710 
aess  of  coal  bed  sampled 
Ft.  in. 
3    4 
Ft.  in. 
4    2 
Ft.  in. 
0    0 
Ft.  in. 
4    6 
Ft.  in. 
10    0 
Ft.  in. 
5    6 
Ft.  in. 
7    3 
aThese  samples  were  collected  according  to  the  uniform  method  described  by  M.  H.  Campbell  on 
pp.  12-13  of  this  volume.  The  analyses  were  made  at  the  chemical  laboratory  "i"  the  fuel-testing 
plant  of  the  United  States  Geological  Survey  at  the  Carnegie  Technical  Schools,  Pittsburg,  under  the 
direction  of  F.  M.  Stanton,  according  to  the  methods  described  by  X.  W.  Lord  in  Prof.  Taper  U.S.  Geol. 
Survey  No.  48,  pt.  1,  1906,  pp.  174-105,  and  in  Bull.  U.  S.  Geol.  Survey  No.  290,  1906,  pp.  29-30. 
&  Samples  collected  in  the  coal  fields  of  east-central  Carbon  County.  Veatch,  A.  C,  Bull.  U.  S.  Geol. 
Survey  No.  316,  1907,  pp.  253-258. 
