176  CONTRIBUTIONS    TO   ECONOMIC    GEOLOGY,  1906,  PART    I. 
furrow,  and  it  is  therefore  believed  that  these  analyses  accurately 
represent  the  character  of  the  ore. 
Table  I. — Analyses  of  Alabama  gray  iron  ore. 
Location. 
Si02. 
Fe. 
P. 
S. 
Mn02. 
CaO. 
A1203. 
H20. 
Ti. 
1 
2 
3 
4 
Magnetite  near  Childersburg 24.60 
Do 10.30 
Siliceous  hematite,  near  Colum- 
biana   30.03 
Do 29.06 
Do 123.45 
Do 16.24 
Do 20.74 
53  90 
60.40 
42. 51 
44.61 
49.08 
49. 27 
53.  81 
36.272 
35.  17 
61.23 
59.  47 
51.91 
56.01 
49.28 
54.  47 
61.37 
47.28 
60.92 
59.03 
42.89 
31.746 
46.  83 
58.01 
0.022 
.065 
Tr. 
.30 
.34 
.01 
Tr 
.330 
.  36 
.  if, 
.  L6 
.30 
.11 
.62 
.  L95 
.666 
.  563 
.025 
.091 
.  15 
.20 
3.00 
.096 
0.04 
.06 
.90 
------- 
.60 
"."637" 
Tr. 
Tr. 
Tr. 
Tr. 
0.14 
1 .  60 
.7,1 
1.26 
Tr. 
Tr. 
Tr. 
.31 
0.32 
.22 
1.94 
L58 
1 .  25 
'".'700' 
.60 
.20 
.80 
.80 
.50 
5. 88 
3.66 
4.00 
A.  31 
1.55 
13. 373 
6.06 
5. 10 
4.22 
4.  78 
12.00 
.08 
L.26 
5 

6 
7 
7.  45 
8 
9 
H) 
!1 
S\V.  |  sec.  15,  T.  22,  R.  2E 
NE.  1  sec.  17,  T.  21,  K.  4  E 
SE.  ise<  .  34,  T.  20.  R.  4  E 
40.  103 
38.  Hi 
7.07) 
7.10 
17.3"> 
2.078 
.40 
.10 
.05 
.10 
'6."  66 
.00 
.00 
12 
Sec.  9,  T.  20,   R.  4  E.,  opposite 
l.; 
Do 
12.84 
N 
Do 19.30 
Do 11.70 
Do 4.40 
Do 20.80 
SE.  1  SE.  j  set  .  16,  T.  20,  R.4  E..  12.77. 
Do    11.00 
Ifi 
Ifi 
17 
is 
10 
"II 
Do 
33.  40 
31.594 
:'i 
( !olumbiana  Mountain 
?.? 
NE.  |NK1  sec.  17 21.98 
NE.  ',  sec.  34,  T.  20,  R.  4E 13 
aa 
19.94 
50.67 
.398 
.291 
.68 
.86 
5.19 
2. 613 
Analyses  1  3,  6  by  E.  A.  Smith  (Porter,  Trans.  Am.  Inst.  Min.  Eng.,  vol.  15);  analysis  4  bj  T  Bj 
Britton  (Smith.  Rept.  Progress  Alabama  Geol.  Surveyfor  1875);  analysis  5  byC.  !■'.  Chandler  (Smith, 
Rept.  Progress  Alabama  Geol.  Survey  [or  L875  ;  analysis 7  by  F.  P.  Dewey  1  Tuomey,  Second  Bienn.  Kept. 
Alabama  Geol.  Survey.  is.-,s  ;  analysis8by  A.  F.  Brainerd  (McCalley,  Valley  regions  of  Alabama,  ptj 
1.  1897);  analyses  0-12  by  W.  B.  Phillips  (McCalley, ibid.);  analyses  13-20, 22, 23 by  W. Crafts  (McCalleyj 
ibid.)j  analysis  21  by  Henry  McCalley. 
From  Table  I  it  will  be  seen  thai  the  range  of  silica  is  from  4.40  to 
40.10,  the  average  being  19.94  for  the  23  analyses.  The  metallic  iron] 
ranges  from  61.37  to  31.74,  averaging  50.67.  The  phosphorus  varies 
from  a  mere  trace  to  3.00,  its  average  value  being  0.398.  The  analy] 
sis  giving  3  per  cent  phosphorus  differs  so  much  from  all  the  others 
that  one  is  inclined  to  suspect  some  error.  Inasmuch  as  the  proof 
reading  on  the  volume  from  which  the  analysis  was  taken  was  not 
carefully  done  it  is  possible  that  the  decimal  point  may  have  been 
misplaced,  so  that  instead  of  3.00  the  value  should  be  0.30.  The  sul- 
phur has  been  quantitatively  determined  for  only  6  of  the  23  analyses, 
hut  for  those  the  average  content  was  0.21)1.  Manganese  also  was 
found  in  several  of  the  samples,  although  in  most  of  them  it  was  neg- 
lected. The  lime  is  vvvy  low,  the  average  being  0.86  per  cent. 
Alumina  is  the  next  highest  component  after  iron  and  silica.  Unfor-j 
tunately  this  oxide  has  been  determined  in  only  10  of  the  analyses; 
the  average,  however,  is  about  5.19  per  cent.  A  striking  departure  j 
is  seen  in  analysis  S,  in  which  the  alumina  rises  to  13.37  per  cent. 
The  water  ranges  between  12.00  and  0.05,  averaging  12.01. 
If  the  iron  is  Fe203,  the  sulphur  SO.,,  and  the  phosphorus  P2Oj 
the  total  of  average  values  obtained  from  all  these  analyses  is 
103.16.  The  excess  over  100  is  probably  due  to  the  incompleteness 
of  many  of  the  analyses  and  the  inclusion  in  some  of  them  of  two  or 
