332 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.         [bull.  260. 
pany.     The  samples  analyzed  represent  the  average  of  the  mine,  and 
were  taken  from  cars  at  the  furnace  at  Holt. 
Partial  analyses  of  brown  ore  from  Giles,  Ala. 
Iron  [metallic] 
Insoluble 
r  cent. 
Per  cent. 
47.27 
47. 40 
16.20 
15.92 
Stock-house  samples  of  ore  from  the  Greeley  banks,  in  the  NW.  J 
of  sec.  31,  T.  20  N.,  R.  5  W.,  gave  the  following  analysis :  « 
Analysis  of  stock-house  sample  of  brown  iron  ore  in  Greeley  ore  banks. 
Per  cent. 
Metallic  iron__     43.08 
Phosphorus    .  45 
Silica 21.  04 
Hygroscopic  water 1.  30 
Combined   water 11.  30 
The  average  composition  of  the  cleaned  and  dried  brown  ore  o 
the  State,  stock-house  delivery,  according  to  Phillips,^  is  as  follows 
Average  composition  of  Alabama  brown  ore,  cleaned  and  dried. 
Pei-  cent. 
Metallic  iron 51.00 
Silica 9.  00 
Alumina    3. 75 
Lime    . .75 
Phosphorus    .  40 
Sulphur - .10 
Brown  ore  is  rather  expensive  to  produce,  owing  to  the  lard 
amount  of  foreign  material  that  must  be  moved  for  every  ton  mined 
and  to  the  necessity  of  cleaning  the  ore  by  washing  it.  There  is, 
always  a  good  demand  for  this  ore,  hoAA7ever,  and  as  its  generally 
high  quality  insures  for  it  the  highest  price  paid  for  ore  in  the 
State  a  small  margin  of  profit  has  usually  been  made  from  mining 
it.  Fuel  is  near  at  hand,  and  limestone  for  furnace  fluxing  is  inti- 
mately associated  with  the  ore,  in  some  places  even  being  mined 
from  the  same  quarry.  In  the  autumn  of  1904:  strippings  were  being 
made  along  ore  banks  whose  full  development  will  nearly  double 
the  present  production  of  the  quadrangle.  Under  present  condi- 
tions, and  even  more  surely  with  prospective  expansion  of  business, 
the  development  of  the  reserves  of  brown  iron  ore  in  this  quadrangle 
promises  well  for  the  future. 
a  McCalley,  Henry,  op.  fit.,  p.  462. 
h  Phillips,  W.  B.,  Iron  making  in  Alabama,  2d  ed.  :  Alabama  Geol.  Surv.,  1898,  p.  57. 
