412  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.         [bull.  260. 
Analyses  of  coal  from  Coal  Creek,  Washington. 
No.  6760. 
Finely 
ground. 
Coarsely- 
ground. 
No.  6761,  finely  ground. 
Moisture 
15.  24 
36.28 
29. 54 
18.94 
22.22 
33.30 
27.11 
- 17. 37 
16.  26 
Volatile  combustible  matter 
Fixed  carbon 
36. 33 
30.  05 
Ash 
17.36 
Sulphur 
100.00 
4.39 
100. 00 
4.03 
100. 00 
4.61 
Color  of  ash 
Light  red-brown !  nrmpokine-. 
Mr.  Schaller  reports  that — 
The  bottle  containing  No.  G7G1  was  broken  when  received  at  the  laboratory. 
A  moisture  determination  of  the  coarsely  ground  sample  gave  17.79  per  cent, 
showing  that  the  coal  had  lost  moisture  in  transit,  due  to  the  bottle  being  broken. 
For  this  reason  no  data  are  given  for  the  coarsely  ground  No.  G7G1  sample. 
An  aluminium  sulphate  occurs  on  the  joint  planes  of  6761.  The  values  for 
volatile  combustible  matter,  fixed  carbon,  and  ash  in  the  coarsely  ground  No. 
67G0  are  calculated  from  the  corresponding  figures  of  the  finely  ground  sample. 
The  high  percentage  of  water,  ash,  and  sulphur  present  are  all 
against  its  utility.  The  coal  was  used  in  running  the  engine  of  the 
mine  and  appeared  to  burn  well,  but  as  to  later  developments  in  the 
mine  no  information  is  at  hand. 
The  bed  of  coal  is  interstratifted  with  a  lot  of  shales  and  shaly 
sandstones  well  exposed  along  Coal  Creek  near  the  mine.  The  strike 
of  these  beds  near  the  mine  is  northwest-southeast,  with  a  dip  of 
about  15°  SW.,  and  it  seems  probable  that  if  the  coal  on  trial  proves 
of  sufficient  value  to  work  it  could  be  traced  to  higher  ground 
where  gravity  would  be  of  greater  service  in  operating  the  mine. 
There  are  igneous  rocks  cutting  the  coal-bearing  beds  in  that  region 
and  the  strata  are  faulted  locally,  but  neither  igneous  rocks  nor 
faults  were  seen  near  the  mine. 
Marine  shells  occur  in  the  strata  3  feet  above  the  coal.  Among 
them  is  the  ribbed  Venericardia  planicosta,  which  is  characteristic  of 
the  Eocene.  The  coal  is  of  essentially  the  same  age  as  that  farther 
north  in  Washington. 
