398        CONTRIBUTIONS   TO   ECONOMIC  GEOLOGY,   1907,   PART  II. 
coking  quality  of  this  coal  is  an  important  consideration.  The  iron 
ore  is  still  undeveloped,  but  so  far  as  known  it  is  the  largest  deposit 
west  of  Mississippi  River,  and  sooner  or  later  it  will  be  mined.  Unfor- 
tunately, no  satisfactory  coking  tests  have  been  made  of  the  southern 
Utah  coal,  although  it  is  reported  that  a  number  of  years  ago  an 
inferior  quality  of  coke  was  produced  in  the  Coal  Creek  valley.  Labo- 
ratory tests  in  a  small  crucible  show  that  the  Colob  coals  fuse  to  a 
slightly  coherent  mass  in  which  grains  of  coal  are  distinctly  visible,  but 
only  tests  on  a  practical  scale  can  determine  whether  commercial 
coke  can  be  made  from  the  southern  Utah  coal.  The  high  sulphur 
content  of  the  Colob  coal  renders  it  an  undesirable  metallurgical  fuel. 
The  cannel  coal  is  massive  bedded,  of  a  brownish-black  color,  and 
has  a  dull  greasy  luster.  Its  fracture  is  conchoidal  and  the  coal  also 
tends  to  break  along  bedding  planes,  although  it  is  notably  tough 
compared  with  the  other  coals.  The  analyses  clearly  show  that  the 
coal  found  in  the  valley  of  North  Fork  of  Virgin  Eiver  possesses  the 
peculiar  properties  of  cannel.  The  volatile  matter  is  high,  from  one 
and  one-half  times  to  twice  as  great  as  the  fixed  carbon;  and  the 
hydrogen  in  the  analyses  of  dry  coal  is  more  than  5  per  cent,  being 
practically  double  that  in  the  other  coal  beds  of  the  Colob  Plateau. 
The  characteristic  peculiarity  of  cannel  is  due  to  the  fact  that  its 
original  ingredients  are  largely  different  from  those  composing  most 
coals.  Thin  sections  of  this  cannel  coal  have  been  examined  by 
David  White,  of  the  United  States  Geological  Survey,  who  reports  as 
follows : 
The  fuel  contains  very  little  in  the  way  of  vestiges  of  the  cell  structures  of  higher 
plants,  being  made  up  largely  of  russet  and  lemon-yellow,  more  or  less  lenticular,  or 
globular,  translucent  bodies  embedded  in  a  brownish-black  groundmass  of  somewhat 
flocculent  aspect.  Some  of  this  translucent  matter  is  probably  resinous,  while  it  is 
possible  that  some  of  the  lemon-yellow  substance,  less  in  quantity,  may  be  gelatinous, 
though  that  is  not  at  all  certain.  On  the  whole,  the  microscopical  composition  of  the 
coal  is  essentially  that  of  a  high-grade  cannel. 
The  heating  value  of  the  cannel  coal  is  low,  9,956  British  thermal 
units  in  one  specimen  and  10,470  in  the  other,  figured  on  an  air-dried 
basis.  These  low  figures,  however,  are  largely  due  to  the  considerable 
amount  of  ash  in  the  coals.  The  high  content  of  volatile  constituents 
makes  cannel  coal  a  valuable  gas  producer. 
KANAB   FIELD. 
LOCATION. 
The  Kanab  coal  field  is  the  eastern  continuation  of  the  Colob  field, 
and  is  named  from  Kanab  Creek.  This  field  is  bounded  by  the  Sevier 
fault  on  the  west,  and  extends  northeastward  toward  Paria  River, 
the  present  work  ending  at  range  5  of  the  Land  Office  survey.  The 
coal  in  the  Kanab  field  in  general  is  more  accessible  than  in  the  Colob 
field;  a  number  of  roads  cross  the  area,  and  the  outcrop  of  the  coal 
