386         CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,   1907,   PART   II. 
R.  A.  Kirker,  who  has  spent  several  years  in  prospecting  this 
field,  numbers  the  coal  beds  from  1  to  6,  the  latter  being  at  the 
base  of  the  section,  and  states  that  the  coal  ranges  from  4  to  7  feet 
in  thickness,  as  follows: 
Thickness  of  coal  beds  in  the  Harmony  field,  Utah. 
[Measured  by  R.  A.  Kirker.] 
Ft.    in 
Bed  1 4 
Bed  2 5 
Bed  3 4      8 
Bed  4 4      4 
Bed  5 7 
Bed  6 4 
The  measurements  for  beds  3  and  4  were  confirmed  by  the  writer, 
but  the  conditions  of  the  workings  were  such  that  the  other  beds 
could  not  be  measured  with  accuracy. 
The  steep  dip  of  the  coal-bearing  rocks  and  the  close  proximity 
of  the  ground-water  level  to  the  surface  will  cause  trouble  in  develop- 
ing this  field,  but  apparently  the  chief  drawback  is  the  dirty  condi- 
tion of  the  coal,  as  shown  by  the  large  amount  of  ash  in  the  analyses. 
Although  considerable  prospecting  has  been  done  in  the  Harmony 
field,  active  mining  has  not  yet  begun.  It  is  reported,  however,  that 
a  Los  Angeles  company  plans  soon  to  develop  the  property. 
QUALITY    OF    THE    COAL. 
The  coal  in  the  Harmony  field  has  been  metamorphosed  by  the 
intrusion  of  a  large  mass  of  andesite  into  the  coal-bearing  rocks. 
The  andesite  occupies  an  area  of  many  square  miles  west  of  the  coal 
field,  and  its  intrusion  has  steeply  tilted  the  strata  adjacent  to  the 
contact,  as  already  mentioned.  In  the  SW.  \  sec.  32,  T.  37  S., 
R.  13  W.,  the  intrusive  rock  is  in  close  proximity  to  the  coal,  but 
the  actual  contact  was  not  seen  nor  was  any  evidence  obtained  that 
the  coal  has  been  coked.  In  other  places  the  outcrop  of  the  andesite 
is  several  hundred  feet  distant  from  the  nearest  coal  bed.  The 
analyses  show  that  considerable  alteration  of  the  coal  has  occurred, 
and,  as  would  be  expected,  that  the  beds  which  are  farthest  away 
from  the  andesite  are  the  least  altered.  Unless  the  intrusive  rock 
extends  eastward  beneath  the  surface,  it  is  probable  that  the  higher 
grades  do  not  extend  far  from  the  outcrop. 
The  coal  in  the  Harmony  field  is  deep  black  in  color  and  has  a 
brilliant  luster.  It  breaks  both  with  a  semiconchoidal  and  a  cubical 
fracture,  and  is  fairly  hard,  though  it  can  be  crushed  in  the  hands. 
The  coal  is  streaked  with  seams  of  bone  and  shale  in  intimate  asso- 
ciation, and,  at  least  locally,  much  foreign  matter  is  present.  Films 
of  iron  pyrite  occur,  irregularly  disseminated.  The  coal  burns  with 
but  little  smoke  and  with  a  faint  blue  flame. 
