04  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,   1906,   PART    1. 
From  a  point  3  miles  above  the  mouth  of  the  Spokane  old  Chines] 
excavations  and  ditches  occur  at  short  intervals  for  about  6  miles  t 
the  month  of  Xinemile  Creek.  None  of  these  old  workings  extende 
more  than  100  yards  from  the  river. 
Three  miles  above  the  Spokane  is  a  bench  about  20  feel  above  the 
river  that  contains  an  accumulation  of  large  angular  bowlders  havinl 
the  appearance  of  a  moraine.  It  is  probably  the  deposit  mentioned 
by  Salisbury  as  the  terminal  moraine  of  the  Columbia  River  glacier.! 
It  extends  along  the  river  about  one-half  mile.  The  pay  streak,  for- 
merly worked  by  Chinese,  occupies  the  spaces  between  these  bowl- 
ders, which  probably  served  as  riffles  to  concentrate  the  line  gold] 
Some  virgin  ground  found  under  a  stump  in  the  old  workings  yielded 
a  fair  result  from  panning,  the  colors  being  of  two  types,  large  thin 
flakes  averaging  0.01  cent  in  value  and  the  ordinary  flour  gold  of  the 
river  averaging  not  over  0.002  cent  in  value.  A  sample  tested  by 
fusion  at  the  concentrating  pavilion  gave  $1.60  per  ton  in  gold,  but 
owing  to  the  prevalence  of  bowlders  not  included  in  the  sample  this 
result   should  naturally  be  reduced  about   one-half. 
At  the  mouth  of  Sixmile  Creek,  a  mile  above  the  point  just  men- 
tioned, the  glacial  bowlders  are  no  longer  to  be  seen  and  a  section  of  the 
terrace  deposit   was  found  to  be  about  as  follows: 
Section  on  Columbia  River  at  mouth  of  Sixmih  Creek. 
Feet. 
Sill  and  gravel,  containing  some  clay 2 
( ira\  ''1  and  clay {\ 
Coarse  open-textured  gravel,  pebbles  mostly  from  older  rocks  and   1 
inches  or  less  in  diameter 20 
The  pay  streak  here  is  confined  to  the  upper  2  feet  of  the  section 
and  was  found  by  panning  to  bave  a  value  of  8  cents  per  cubic  yard. 
The  gold  obtained  includes  some  large  thin  flakes  averaging  0.01  cent 
in  value  and  much  fine  Hour  gold.  A  sample  tested  by  fusion  at  the 
concentrating  pavilion  yielded  only  1  cents  per  ton.  There  is  a  pay 
streak  2  feet  thick  here,  extending  back  from  the  river  possibly  S00 
or  900  feet,  which  will  yield  from    1   to  8  cents  per  cubic  yard. 
Two  miles  farther  up  the  river,  near  the  mouth  of  Xinemile  Creek, 
there  are  something  over  300  acres  of  land  in  two  benches,  one  about 
30  and  the  other  loo  feet  above  Columbia  River.  The  section  on  the 
lower  bench  is  approximately  as  follows: 
Section  of  lov < r  lunch  n/i  Columbia  River  near  Ninemile  Creek. 
Feet. 
Sandy  sill  .  from  ;i  few  inches  to 7 
Iron-stained  sand,  gravel,  and  day  (pay  streak) 1 
Open-textured  gravel 20 
Old  Chinese  workings  extend  about  200  feet  back  and  three-fourths 
of  a  mile  along  the  river.     The  limit  of  the  workings  back  from  the 
oSalisburj ,  K.  l>..  Jour.  Geol.,  vol.  '.»,  L901,  ]>■  7sj, 
