KOCK   SPRINGS    COAL   FIELD,    WYOMING. 
273 
5365. 
5926. 
5364, 
105  \V. 
57.S5. 
5806. 
5928. 
5695, 
5805. 
5358. 
5598, 
53ti(). 
5694. 
5362. 
535!). 
5361. 
5696. 
5363. 
5698. 
5697. 
6013. 
5370. 
5369. 
536S. 
5357. 
5373. 
5699. 
5S12. 
5372. 
Rock  Springs;  sec.  11,  T.  18  N.,  R.  105  W. 
Superior;  sec.  27,  T.  21  N.,  R.  102  W. 
5366.  Rock  Springs;  sec.  11,  T.  18  N.,  R. 
Superior;  sec.  28,  T.  21  N. 
Gimn:  sec.  8,  T.  19  N.,  R. 
Superior;  sec.  27,  T.  21  N. 
5786.  Superior;  sec.  20,  T. 
Gunn;  sec.  8,  T.  19  N.,  R. 
Rock  Springs;  sec.  35,  T. 
5596.  Superior;  sec.  20,  T. 
Rock  Springs;  sec.  25,  T. 
Sec.  5,  T.  21  N.,  R.  103  W. 
Rock  Springs;  sec.  25,  T. 
Rock  Springs;  sec.  26,  T. 
Rock  Springs;  sec.  25,  T. 
Sec.  3,  T.  21  N.,  R.  103  W. 
Rock  Springs;  sec.  25,  T. 
Sec.  3,  T.  21  N.,  R.  103  W. 
Sec.  9,  T.  21  N.,  R.  103  W. 
Superior;  sec.  20,  T.  21  N. 
Sec.  23  T.  21  N.,  R.  104  W 
Sec.  10,  T.  21  N.,  R.  104  W 
Sec.  14,  T.  21  N.,  R.  104  W 
Rock  Springs;  sec.  26,  T. 
Sec.  34,  T.  21  N.,  R.  104  W 
Sec.  8,  T.  21  N.,  R.  103  W. 
Sec.  18,  T.  20  N.,  R.  102  W 
Sec.  34,  T.  21  N.,  R.  104  W 
,  R.  102  W. 
104  W. 
.  R.  102  W. 
21  N.,  R. 
104  \V. 
19  N.,  R. 
21  N.,  R. 
19  N.,  R. 
102  W. 
105  W. 
102  W. 
105  W. 
19  N.,  R.  105  W. 
19  N.,  R.  105  W. 
19  N.,  R.  105  W. 
19  N.,  R.  105  W. 
,  R.  102  W. 
19  N.,  R.  105  W 
5371.  Sec.  12,  T.  21  N.,  R.  104  W. 
5813.  Sec.  23,  T.  20  N.,  R.  102  W. 
5376.  Sec.  34,  T.  21  N.,  R.  104  W. 
5814.  Sec.  16,  T.  20  N.,  R.  102  W. 
5809.  Sec.  29,  T.  20  N.,  R.  102  W. 
6042.  Rock  Springs;  sec.  22,  T.  19  N.,  R.  105  W. 
5804.  Sec.  21,  T.  23  N.,  R.  103  \Y. 
5353.  Sec.  6,  T.  22  N.,  R.  103  W. 
5351.  Point  of  Rocks;  sec.  26,  T.  20  N.,  R.  101  W. 
5352.  Sec.  26,  T.  20  N.,  R.  101  W. 
5347.  Sec.  6,  T.  22  N.,  R.  103  W. 
5950.  Sec.  6,  T.  22  N.,  R.  103  W. 
5597.  Sec.  10,  T.  21  N.,  R.  102  W. 
5599.  Sec.  10,  T.  21  N.,  R.  102  W. 
5348.  Sec.  24.  T.  22  N.,  R.  103  W. 
5349.  Sec.  6,  T.  22  N.,  R.  103  W. 
5350.  Sec.  34,  T.  22  N.,  R.  104  W. 
5951.  Sec.  31,  T.  19  N.,  R.  100  W. 
5952.  Sec.  16,  T.  18  N.,  R.  100  W. 
5808,  5811.   Black  Buttcs;  sec.  20,  T.  18  N.,  R. 
100  W. 
5810.  Sec.  31,  T.  19  N.,  R.  100  W. 
5930.  Sec.  28,  T.  19  N.,  R.  100  W. 
5803.  Sec.  24,  T.  23  N.,  R.  104  W. 
5802.  Sec.  24,  T.  23  N.,  R.  104  W. 
5374.  Sec.  29,  T.  21  N.,  R.  104  W. 
5375.  Sec.  17,  T.  21  N.,  R.  104  W. 
5367.  Sec.  30,  T.  21  N.,  R.  104  W. 
QUALITY    OF    COAL. 
The  analyses  show  that  all  samples  collected  from  surface  outcrops, 
as  well  as  some  collected  from  shallow  or  open  prospect  pits,  give 
much  lower  values  than  samples  collected  from  mines  or  more  exten- 
sive prospects,  where  good  unaltered  samples  of  coal  could  be  obtained. 
Although  the  coal  obtained  from  prospect  pits  may  seem  firm  and 
little  altered,  it  seldom  gives  as  good  chemical  results  as  samples 
obtained  from  the  mines.  Many  analyses  of  weathered  samples  show 
approximately  one-half  the  heat  values  obtained  with  mine  samples 
from  the  Rock  Springs  coal  group.  On  closer  examination  the 
coal  clearly  shows  its  weathered  condition.  From  the  various  mine 
samples  collected  it  appears  that  all  the  Rock  Springs  or  lower  Mesa- 
verde  coal  falls  in  the  bituminous  class.  The  upper  Mesaverde  coal, 
or  that  of  the  Almond  group,  is  physically  and  chemically  more  closely 
related  to  the  coals  of  the  Black  Buttes  and  Black  Rock  groups  than 
to  the  lower  Mesaverde  or  Rock  Springs  coal.  All  the  coals  above  the 
lower  Mesaverde  contain  more  moisture  and  are  lighter  in  weight  than 
those  of  that  group,  and  slack  considerably  on  exposure  to  the  air. 
These  coals  fall  in  the  subbituminous  class,  but  on  the  whole  are 
better  than  the  Adaville  and  Evanston  coals  of  southern  Uinta 
County.  The  coals  of  the  Rock  Springs  held  have  a  low  sulphur  con- 
tent, which  ranges  from  0.30  to  1.52,  but  is  usually  less  than  1  percent. 
They  are  comparatively  clean  coals  and  have  a  low  content  of  ash. 
The  following  statement  may  be  considered  as  representing  the  beds 
of  these  four  coal  groups: 
1497— Bull.  341—09- 
L8 
