dillek.J  SO-CALLED    TRON    ORE    NEAR    PORTLAND,    OREG.  345 
analyzed  6762,  which  seemed  to  be  the  purest  glass,  collecting  also 
sample  6764  from  the  overlying  and  6763  from  the 'underlying  ma- 
terial, which  appeared  to  be  decidedly  fragmental.  All  of  these 
samples  were  taken  at  a  point  about  300  feet  above  the  railroad  and 
within  5  feet  of  one  another.  Mr.  Roberts  was  with  me  at  the  time 
and  gave  from  memory  46,  35,  and  36,  respectively,  as  the  approxi- 
mate percentages  of  contained  iron  reported  by  an  assayer. 
Mr.  George  Steiger,  in  the  chemical  laboratory  of  the  Geological 
Survey,  made  a  chemical  analysis  of  0762  with  the  following  results: 
Analysis  of  so-called  "iron  ore"  from  near  Portland,  Oreo. 
.      Si02   40.89 
ALOs    10.41 
Fe20:i   15.00 
FeO    .07 
MgO                                                                                                      —  3.  7G 
CaO   __.                                                                      5.18 
Na20    _                                                                                          .47 
K20    .53 
ILO  -                                                                                                 9.  14 
H,0  +    10.  32 
TiO,. -__  3.37 
CO,    None. 
PX>5 .52 
S    «.03 
MnO    .90 
V203    .01 
Total 1()().  GO 
The  oxides  of  iron  in  this  sample  amount  to  15.07  per  cent  and  are 
equivalent  to  10.55  per  cent  of  metallic  iron.  The  amount  of  iron 
in  the  overlying  bed  is  10.76  per  cent  and  in  the  underlying  10.84  per 
cent.  Although  quite  unlike  in  appearance  they  show  a  remarkable 
uniformity  in  the  amount  of  contained  iron,  and  it  is  probable  that 
the  whole  mass  contains  approximately  the  same  percentage. 
When  the  foregoing  analyses  were  completed  they  were  sent  to 
Mr.  Roberts,  who,  by  letter  of  January  3,  1905,  informs  me  that  Miss 
Hampton  "made  about  15  assays,  and  the  lowest  was  -JO  per  cent 
metallic  iron,  the  highest  46  per  cent.  J.  IT.  Fisk  got  21  per  cent.'1 
After  seeing  the  results  of  the  Survey  analyses  he  stated  that  "  Miss 
Hampton  assayed  two  samples  taken  from  the  upper  level  (or  light- 
colored  ore)  and  one  at  the  base  on  the  railroad,  and  each  assayed 
37  per  cent  metallic  iron."  Mr.  Roberts  further  asserts:  k'  I  got 
more  than  20  per  cent  in  the  blast  furnace.  As  soon  as  the  weather 
will  admit  I  shall  build  another  furnace  and  prove  who  is  making 
the  mistakes." 
It  was  not  determined  whether  sulphur  was  present  as  sulphide  or  sulphate. 
