COAL   ON   SOUTHWEST   SIDE   OF   BIGHORN    BASIN,    WYO. 
217 
at  Red  Lodge,  Mont.,  but  in  smaller  nodules  and  more  widely  scat- 
tered than  in  either  of  the  coals  noted.  The  physical  properties  of 
the  beds  in  the  higher  strata  resemble  those  of  the  coal  at  Red  Lodge 
and  Bear  Creek,  Mont.,  and  the  lower  coal  is  similar  to  that  at 
Bridger.  To  the  unaided  eye  the  coal  appears  free  from  pyrite,  but 
under  a  lens  small  irregular  particles  are  visible. 
CHEMICAL    PROPERTIES. 
The  composition  of  the  coal  is  shown  in  the  accompanying  table. 
Samples  for  analysis  were  taken  at  the  various  mines  and  prospects  in 
the  field  according  to  the  method  described  by  M.  R.  Campbell  on  pages 
12-13  of  this  volume.  Analyses  were  made  under  the  direction  of 
F.  M.  Stanton,  of  the  United  States  Geological  Survey. 
The  table  shows  both  proximate  and  ultimate  analyses  of  the  coal 
as  received  at  the  laboratory  and  after  air  drying.  The  analysis  of 
the  sample  as  received  indicates  the  condition  of  the  coal  as  it  comes 
from  the  mine;  that  of  the  air-dried  sample  denotes  approximately 
the  state  of  the  coal  as  it  is  burned.  In  comparisons,  therefore,  the 
analysis  of  the  air-dried  sample  should  be  taken. 
Analyses  of  coal  samples  from  the  southwest  side  of  the  Bighorn  Basin,  Wyoming. 
[F.  M.  Stanton,  chemist  in  charge.] 
Name  of  field 
Laboratory  No 
Sample  as  received: 
I  Moisture 
Volatile  matter... 
Fixed  carbon 
[Ash 
I  [Sulphur 
I  rydrogen 
Carbon 
Nitrogen 
Oxygen 
Calories 
British  thermal  units 
Loss  of  moisture  on  air 
drying 
Air-dried  sample: 
I  Moisture 
Volatile  ma1  ter. . 
Fixed  carbon 
|Ash 
IlSulphur 
Hydrogen 
Carbon 
\  i  l  n  >gen 
Oxygen 
Calories 
British  thermal  units 
Cody. 
a  5763.    a  5766.    b  5762.    6  5767 
Meeteetse. 
6  5768.    6  5764.    6  5769. 
Grass 
Creek. 
a  5770. 
Gebo. 
6  5787.    6  5788.  c5765 
13.77 
35.  03 
39.31 
11.89 
.64 
5.42 
52.  84 
1.00 
28.21 
5,148 
9,266 
17.29 
31.33 
45.89 
5.49 
.35 
5.64 
59.15 
.85 
28.52 
5,586 
10,055 
13.43 
35.16 
42.86 
8.55 
.44 
5.92 
58.42 
1.05 
25.62 
5,638 
10,148 
15.04 
31.87 
38.39 
14.70 
.76 
5.49 
52.42 
.97 
25.  66 
5,150 
9,270 
17.67 
27.28 
47.46 
7.59 
.17 
5.35 
57.08 
.84 
28.97 
5,382 
9,688 
16.12 
35. 12 
40.78 
7.98 
.53 
5.91 
54.12 
.92 
30.54 
5,179 
9,322 
15.04 
32.49 
41.64 
10.83 
1.07 
5.67 
55.43 
1.10 
25.90 
5,514 
9,925 
4.80 
5.70 
9.42 
36.80 
41.29 
12.49 
.67 
5. 14 
55.  50 
i  05 
25.  15 
5,408 
9,733 
5.00 
30 
5.50 
4.40 
12.29 
33.  22 
48.67 
5.82 
.37 
5.31 
62.73 
.90 
24.87 
5,924 
10,662 
8.87 
37.01 
45.12 
9.00 
.  46 
5.  64 
61.50 
1.11 
22.29 
5,935 
10,682 
10.  94 
33.41 
40.  24 
I."..  41 
.80 
5.22 
54.95 
l.oi 
22.61 
5,398 
9,717 
12.  L3 
29.12 
50.65 
8.10 
.  is 
4.96 
60. 92 
.  90 
24.  94 
.-..711 
10,339 
11.21 
37. 16 
43.  15 
8.  45 
.56 
5.61 
57.27 
.'17 
27.  It 
5,480 
11.13 
33.98 
43.56 
11.33 
1.12 
5.42 
57.98 
1.  I.", 
23.00 
5,768 
9, Mif.     11I.3S2 
12.84 
33.96 
48.15 
5.05 
.39 
5.92 
63.68 
.80 
24.16 
6,248 
11,246 
17.04 
35.53 
•t;,.  Id 
2.33 
.37 
5.96 
62.22 
1.11 
28.01 
6,106 
10,991 
16.11 
32.96 
48.09 
2.84 
5.97 
62.50 
L.04 
27.15 
6,228 
11,211 
2.90 
5.30 
5.40 
10.  24 
34.97 
19  59 
5  20 
.40 
5.  77 
65.58 
33 
22.22 
6,  135 
1 1 .  582 
12.40 
37.  52 
17  62 
2.  if- 
65.70 
I.  17 
24  61 
...  IIS 
11,606 
11.32 
34.84 
50.84 
3.00 
66.07 
I.  in 
6,584 
11,851 
12.08 
32.58 
49.  23 
6.11 
.91 
5.42 
63.76 
.99 
22.81 
6,251 
11,252 
,00 
9   16 
50.75 
6  30 
.94 
65  73 
1.02 
20.76 
...  lit 
II.  ',0(1 
.'Sample.!  by  E.  <i.  Woodnill'.       6  Sampled  by  R.  L.  Nelson.        oSampled  l..\    E    I..  De  Golyer. 
According  to  the  classification  of  coal  ado pie< I  by  the  United  States 
Geological  Survey,  these  coals  are  of  the  high-grade  subbituminous 
