238  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   1905. 
show  it  to  be  anthracite  of  excellent  quality,  containing  only  a  normal  percentage  of  ash. 
No  statemenl  can  be  made  as  to  its  probable  extent. 
The  lowest  opening  on  the  road  is  on  a  seam  KM)  feet  or  more  stratigraphically  highel 
in  the  scries  than  the  scam  just  described.  This  coal  measured  (1  feet  2  inches,  without 
partings,  at  the  breast  of  a  1  10-foot  drift,  and  is  supposed  to  be  the  Wadge  seam.  A 
sample  (F)  cut  from  the  whole  face  shows  on  analysis  a  composition  very  similar  to  that 
of  the  Wadge  coal.     This  analysis  is  as  follows: 
Analysis  of  coal  (Samph  F)from  bituminous  seam  on  Crawford  trad,. 
[F.  M.  Stanton,  analyst.] 
Per  cent. 
Moisture 11.74 
Volatile  matter 35.31 
Fixed  carbon 47.36 
Ash 5.59 
100.00 
Sulphur 56 
Loss  of  moisture  on  air  drying .r>.7(t 
To  the  south  and  east  of  the  pip  above  the  Crawford  mines  and  near  the  road  are  sever! 
openings  on  coal  seams  of  the  middle  group,  so  badly  fallen  in  that  the  coals  were  not 
measured.  One  tunnel  mar  I  he  road  was  reported  to  have  opened  a  thick  seam  of  coal 
that  ran  high  in  ash,  and  ii  is  thoughl  thai  this  may  he  the  same  seam  as  the  thicker  one 
opened  in  the  Crawford  property,  which  also  carries  a  considerable  percentage  of  ash,  as 
shown  by  analyses  K  and  (i  on  page  — . 
A  seam  of  the  lower  coal  group  has  been  opened  and  mined  for  domestic  use  on  the  face, 
of  a  steep  ridge  in  a  school  seel  ion  to  the  east  of  the  openings  last  mentioned.  This  open- 
ing showed  about  8  feet  of  solid  coal,  hut  could  not  be  measured  exactly,  as  the  lower  pan 
of  the  coal  was  standing  in  water.  The  seam  dips  about  10°  W.  From  this  point  north-  • 
ward  the  lower  coal  group  outcrops  along  the  east  side  of  Pilot  Knob  and  is  exposed  in 
the  openings  on  the  head  of  Miller  Gulch  and  in  those  Dear  the  Ducey  tunnel.  On  Miller 
Gulch  a  recently  opened  prospect  was  sampled  lor  analysis  ill).  This  sample  was  cut 
across  the  face  of  a  seam    1  feet    1   inch  thick. 
Analysis  of  coal  [Sarwph  H)from  prospect  at  head  •>/'  Miller  Gulch. 
[  F.  M   Stanton,  analyst.] 
Per  cent. 
Moisture 1 0. 80 
Volatile  matter ;J4.32 
I  i  xed  carbon 49.41 
Ash 5.47 
Kill  (Ml 
Sulphur 58 
Loss  of  moist  lire  on  air  drying 5.70 
The  Ducey  tunnel  is  on  the  east  side  of  Pilot  Knob.  It  has  been  worked  for  about  nine 
years  to  supply  the  settlers  on  the  head  of  Deep  Creek,  and  the  coal  has  been  hauled  as 
fat  a~>  Hahns  Peak.  The  old  tunnel  showed  .">  feet  of  solid  block  coal  dipping  lightly  to 
the  west.  The  coal  docs  not  appear  to  have  been  affected  by  its  proximity  to  the  hug] 
basalt  mass  of  Pilot  Knob.  Fifty  feet  above  the  old  tunnel  a  scam  having  a  thickness  of 
5  feet  2  inches  ha--  recently  been  opened. 
About  3  miles  northeast  of  Pilot  Knob  a  thick  sheet  of  basalt,  known  as  the  "rim  rock," 
i-  exposed,  lying  in  a  neatly  horizontal  position  and  intei  bedded  with  the  lower  coal  <;roup. 
The  property  known  as  the  Shelton  tract  overlies  this  intruded  sheet.  Coals  of  this  tract 
have  been  extensively  prospected,  both  by  pits  and  bore  holes,  and  anthracite  is  reported 
to  have  been  found  over  most  of  the  field  that  lies  directly  above  the  basalt  sheet.  The 
outcropping  rim  of  the  sheet  is  continuous  for  a  number  of  miles  to  the  north  and  it  appears 
to  occupy  a  single  horizon  in  the  sedimentary  series.  If  th;^  is  true,  its  effeel  on  the 
overlying  coal  seams  may  have  been  uniform  over  a  very  considerable  area. 
