148         CONTRIBUTIONS   TO   ECONOMIC    GEOLOGY,   1907,   PART   II. 
The  following  sections  represent  the  upper  bed  of  the  Ulm  coal 
group : 
Sections  of  Upper  Ulm  coal  bed. 
NEAR  CENTER  OF  EAST  SIDE  SEC.  33,  T. 
54  N.,  R.  80  W. 
Shale.  F*- in- 
Coal 3 
Shale,  carbonaceous 3 
Coal 4 
Shale 2 
Coal 5 
Coal,  bony  to  base  of  exposure .  4 
Total  workable  coal 12 
OUTCROP  NEAR  CENTER  OF  EAST  SIDE 
SEC.  13,  T.  56  N.,  R.  82  W. 
Ft.  in. 
Shale,    carbonaceous,    with   many- 
thin  seams  of  coal 20 
Coal 5 
Shale 4 
Coal 1 
Shale 5 
Coal 1 
Shale,  carbonaceous. 
Total  coal  bed 7    9 
Three  feet  of  coal  that  is  considered  to  be  the  central  part  of  the 
Upper  Ulm  bed  is  exposed  in  a  natural  outcrop  near  the  northeast 
corner  of  sec.  12,  T.  54  N.,  R.  81  W. 
DEVELOPMENT. 
Coal  mining  in  the  Sheridan  district,  except  for  local  domestic  fuel, 
is  restricted  to  the  coal  beds  of  the  Tongue  River  group  •  on  Goose 
Creek  and  Tongue  River.  The  thriving  mining  communities  of 
Dietz,  Carneyville,  Monarch,  and  Kooi  are  an  index  to  the  rapid 
growth  of  the  coal-mining  industry.  The  following  information  in 
regard  to  the  development  of  the  field  is  obtained  from  an  article  by 
Stewart  Kennedy  a  and  from  field  work  in  1907. 
As  early  as  1880  coal  of  workable  thickness  was  known  and  mined 
for  domestic  use  by  ranchmen  at  the  present  location  of  Dietz.  From 
this  time  on  to  1893,  when  the  first  commercial  mining  began,  coal 
from  several  prospects  on  what  are  now  known  as  the  Dietz  coal  beds 
Nos.  1  and  2  was  mined  and  hauled  to  Sheridan.  A  drift  was  run  on 
the  Dietz  No.  1  coal  near  the  east  side  of  sec.  34,  T.  57  N.,  R.  84  W., 
in  the  winter  of  1892-93  and  the  first  shipment  of  coal  was  made  in 
the  following  May.  Operations  continued  until  1899,  the  coal  being 
mined  by  pick  and  hoisted  by  mule  power.  A  modern  steam  plant 
was  erected  in  1899  for  the  development  of  mine  No.  1  and  the  output 
was  greatly  increased.  A  shaft  was  put  down  in  1900  in  sec.  35,  T.  57 
N.,  R.  84  W.,  to  the  Dietz  No.  2  coal  bed  and  the  development  of  mine 
No.  2  began  with  the  erection  of  a  complete  hoisting  plant  and  shops. 
Later  a  large  electric  plant  was  built  and  machine  mining  and  electric 
haulage  were  established  in  the  Dietz  mines.  In  1903  a  shaft  was 
sunk  on  the  Dietz  No.  2  coal  bed  in  sec.  3,  T.  56  N.,  R.  84  W.,  and  a 
modern  hoisting  plant  established  as  mine  No.  3.     Also  a  slope  was 
a  Mines  and  Minerals,  vol.  27,  1907,  pp.  294-297. 
