I- 
62  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,    1906,   PART    I. 
Jerome  post-office;  Rogers  Bar,  a  few  miles  below  Hunter;  Blue  and 
Turtle  Rapids  bars,  about  5  miles  above  Hunter;  Stranger  Creek  Bar, 
opposite  Gifford;  and  a  bar  about  6  miles  above  Daisy.  In  the  Sai 
poil  Valley  there  are  no  indications  that  placer  gold  has  ever  b< 
produced  or  exists  in  commercial  amounts  except  on  one  or  two  of 
its  tributaries.  The  more  important  of  the  deposits  named  above 
will  be  described  in  detail  as  follows: 
COLUMBIA    VALLEY. 
Nespelem  Bar  is  a  terrace  half  a  mile  wide,  loo  feet  above  the 
Columbia  at  the  mouth  of  the  Nespelem,  which  Hows  across  the  bai 
in  a  narrow  canyon.  Two  miles  above  its  mouth  the  Nespelem  it 
incised  in  an  upper  terrace  more  than  1,000  feei  above  the  Columbia 
to  w  Inch  it  descends  in  a  series  of  falls  caused  by  outcropping  crystal- 
line rocks.  The  lower  terrace  has  a  nearly  level  surface  and  where 
cut  by  the  canyons  presents  the  following  section: 
Section  of  lower  terract  <>n  Columbia  River  at  mouth  of  the  Nespelem. 
Feet. 
Sand)  loam 8  L5 
I  ■  I ■:■  \  el \     I 
Stratified  clay,  locally  called  eoapstone 80 
Although  320  acre--  of  land  situated  here  have  been  secured  by 
patent  for  placer-mining  purposes,  gold  was  found  at  only  one  locall 
it\  in  a  thin  pay  streak,  consisting  of  iron-stained  sandy  clay  resting 
on  sand,  somewhat  above  the  general  level  and  covering  about 
2  acres  of  ground.  No  gold  was  found  by  panning  in  any  of  the 
beds  composing  the  foregoing  section.  Similar  tests  of  the  sands 
from  the  beds  of  gullies  cutting  through  to  the  clay  bed  rock  and  of 
material  from  the  bed  of  Nespelem  River  also  gave  negative  results! 
It  was  estimated  that  there  is  no  ground  on  this  bar  which  can  be 
expected  to  yield  as  much  as  o.oi  cent  per  cubic  yard  by  placer] 
mining  methods. 
Hell  Gate  Bar3  situated  on  the  north  side  of  Columbia  River] 
between  the  mouth  of  the  Sanpoil  and  Hell  (late  Rapids,  is  a  st rip 
of  land  about  2  miles  long  and  from  300  feet  to  half  a  mile  wide. 
The  placer  gold  is  confined  to  a  low  bench,  which  is  probably  over- 
llowed  at  times  of  extreme  high  water.  Much  of  its  surface  is  cov- 
ered with  river  bowlders  from  a  few  inches  to  afoot  in  diameter,  and 
the  pay  dill  is  contained  either  in  the  crevices  between  these  bowl- 
ders or  in  a  well-defined  pay  streak  consisting  of  iron-stained  gravel 
from  a  few  inches  to  a  foot  thick  within  :\  feet  of  the  surface.  There 
is  little  overburden  and  the  gold-bearing  layer  is  easily  reached. 
The  average  value  of  this  pay  streak  is  estimated  by  panning  to  be 
5  cents  per  cubic  yard.     The  colors  of  gold  are  all  fine,  averaging 
