192        CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,   1907,   PART  II 
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openings  about  500  feet  apart,     The  southern  opening  runs  N.  85 
W.     A  section  taken  700  feet  in  from  the  mouth  of  this  opening  is  as 
follows : 
Section  of  coal  bed  in  south  opening,  McCarthy  mine  No.  2. 
Sandstone.  Ft.   in. 
Coal  (poor,  used  as  roof) 3 
Coal,  good 6 
Bone 9 
Coal 2 
Bone 6 
Coal 2    4 
Sandstone  floor. 
Total  minable  coal 4  10 
A  fault  of  3-foot  throw  was  noted  300  feet  in  from  the  mouth  of  the 
first  opening.  It  strikes  north  and  south,  with  a  downthrow  on  the 
west  side.  Several  other  faults  were  found  farther  in,  according  to 
Mr.  Weber,  one  of  the  operators ;  but  they  have  small  throws  and  do 
not  interfere  with  the  mining  of  the  coal. 
The  Gebo  mine  is  located  1  mile  west  of  Coalville  (formerly  called 
Gebo),  Mont.,  in  the  NE.  i  NE.  \  sec,  13,  T.  5  S.,  R.  22  E.  It  is  con- 
nected with  the  branch  line  of  the  Northern  Pacific  Railway  by  a 
spur  from  Fromberg,  and  is  owned  and  operated  by  the  Bituminous 
Coal  Company. 
This  mine  is  worked  by  the  room  and  pillar  system.  Up  to  the 
time  of  the  writer's  visit,  the  coal  wTas  mined  by  electric  machines, 
but  owing  to  a  strike  among  the  miners  the  machines  were  taken 
out  and  hand  mining  was  adopted.  The  coal  is  hauled  by  an  electric 
tramway  out  of  the  mine  to  a  steel  tipple  three-fourths  of  a  mile  awray. 
Electric  power  is  used  for  tram,  hoist,  drilling,  and  ventilation.  The 
output  is  200  tons  per  day.  The  beds  dips  about  6°  W.  It  is  mined 
from  three  openings,  one  running  northeastward  and  tapping  a  small 
outlying  area  called  by  the  miners  a  "bench."  At  the  working  face 
of  the  northeast  entry,  1,000  feet  from  the  mouth,  the  following  sec- 
tion was  made: 
Section  of  coal  bed  in  northeast  entry,  Gebo  mine. 
Ft.    in. 
Coal,  bony,  used  as  roof 2 
Coal,  good 1     1 
Coal,  bony 1     4 
Coal,  good 3 
Coal,  bony,  used  as  floor. 
Total  minable  coal 4     1 
In  the  main  slope,  which  runs  westward  under  the  bluff,  the  follow- 
ing section  was  taken  500  feet  from  the  entrance: 
