284  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1905. 
Ft.       in. 
2    fCoal 2         8 
iBonc  and  shale 3 
Sandstone, 3-10 
1    fCoal 1 
"  iBone 4-  6 
Sandstone. 
Coal  No.  2  is  the  most  important,  and  locally  a  bed  approximating  4  feet  in  thickness 
is  formed  by  the  coalescing  of  Nos.  2  and  3  and  the  pinching  out  of  the  intervening  sand- 
stone. The  coal  is  lustrous  black.  It  is  much  jointed  in  many  directions  and  breaks 
easily  into  small  pieces.  The  principal  joints  occur  in  two  sets,  east-west  and  north-south, 
corresponding  to  the  jointing  in  the  adjacent  rocks.  Thin  films  of  calcium  carbonate 
occur  along  the  joints  and  small  patches  of  rosin  are  disseminated  through  the  coal.  The 
ease  with  which  the  coal  breaks  impairs  its  value,  as  it  results  in  a  large  amount  of  line 
coal  when  it  is  mined. 
A  sample  of  bed  No.  2  was  collected  in  the  mine  by  crosscutting  the  seam  with  the  purpose 
of  obtaining  an  average  and  was  sent  in  a  sealed  can  to  the  laboratory  of  the  United  States 
Geological  Survey  coal-testing  plant  at  St.  Louis,  Mo.,  where  it  was  analyzed  by  F.  M. 
Stanton  with  the  following  results: 
Analysis  of  coal  from  bed  No.  2,  Morrison  mine. 
8.07 
Moist  ii  re 8.07 
Volatile  combustible 42.59 
Fixed  carbon 43. 20 
A  sli 6. 14 
100. 00 
Sulphur 92 
Air-drying  loss 1.80 
Calories 6,537 
Fuel  ratio 1.01 
This  is  a  bituminous  coal  having  a  somewhat  high  amounl  of  volatile  combustible  matter 
and  therefore  a  low  fuel  ratio.  The  percentage  of  moisture  is  rather  high  and  the  sulphur 
is  low.  At  the  mine  it  is  reporti  d  that  the  coal  will  not  coke.  To  judge  from  the  analysis, 
the  Sterling  coal  is  similar  to  that  mined  in  Carbon  County.     • 
Coal  was  long  known  to  occur  in  this  vicinity,  but  it  was  not  developed  until  1888,  when 
an  opening  was  made  on  the  outcrop  above  the  pri  si  nt  workings.  About  1894  the  railroad 
was  extended  to  the  mine  and  the  coal  worked  in  a  slope  until  so  much  trouble  was  caused 
by  water  that  the  mine  was  abandoned  and  the  present  tunnel  was  made.  The  mouth  of 
the  tunnel  is  on  the  hillside  along  the  east  bank  of  Sixmile  Creek.  It  was  driven  through 
bull'  sandston  •  and  thin  beds  of  shale  until  the  coal  was  struck  at  a  distance  of  about  2,000 
feet.     The  coal  dips  from  15°to20°E. 
A  copious  amount  of  water  has  been  encountered  in  this  mine,  but  it  is  easily  drained  and 
the  water  is  transported  in  a  ditch  to  Manti,  a  distance  of  about  6  miles.  The  water  right 
is  a  valuable  asset.  August  17,  1905,  the  discharge  at  the  mouth  of  tin;  tunnel  was 
found  by  C.  S.  Jarvis  to  be  5.6  second-feet.  It  is  likely  that  the  water  is  associated  with  the 
fault  east  of  the  mine.  It  probably  comes  from  the  westward-dipping  sandstone  of  the 
plateau  region  to  the  east  and,  being  under  hydrostatic  pressure,  rises  when  it  reaches  the 
fault  plane.  There  are  a  number  of  strong  springs  associated  with  faults  in  this  general 
region. 
The  fault  plane  has  not  yet  been  reached  in  the  workings.  When  it  is  the  coal  will  be 
found  to  be  cut  off  abruptly  and  its  further  continuation  must  be  sought  by  sinking.  How* 
far  dowm  can  not  be  told,  for  there  is  no  measure  of  the  throw  of  the  fault 
Other  occurrences  of  this  coal  are  limited  to  the  region  between  Manti  and  Sterling,  for 
north  of  Manti  the  associated  strata  have  been  eroded  and  south  of  Sterling  they  are  covered 
by  Tertiary  beds.  The  best  coal  appears  to  be  confined  to  the  area  already  exploited  and 
seems  to  be  a  local  deposit.  Only  thin  beds  have  been  found  in  the  valleys  immediately 
north  and  south  of  the  present  workings. 
