26 
IRON ORES OF IRON SPRINGS DISTRICT, UTAH. 
Analyses of Homestakc limestone. 
UNALTERED HOMESTAKE LIMESTONE. 
A. a 
B. 
C. 
D. 
E. 
F. 
G. 
Si02 
8.08 
1.95 
.87 
6.90 
1.03 
1.04 
3.78 
1.14 
1.80 
16.48 
1.78 
3.12 
A1203 
.71 
Fe2C>3 
Fe 
0.28 
0.46 
.95 
1.12 
Fe() 
.00 
2.86 
46.67 
.13 
.77 
1.01 
.05 
37.00 
None. 
.75 
4.52 
47.15 
.13 
.93 
1.04 
.04 
30.42 
MgO 
.64 
50.39 
1.78 
50.77 
2.67 
40. 46 
CaO 
Na 2 
K 2 
H 2 0+ 
P2O5... 
.042 
39.92 
.03 
.03 
.037 
.023 
C0 2 
BaO 
100.05 
99.95 
97.71 
1 
a These letters are used throughout the discussion of the Bomestake limestone in referring to the 
specimens and their analyses. 
ALTERED HOMESTAKE LIMESTONE NEAR ANDESTTE CONTACT, AND DIOPSIDE. 
Normal contact phase. 
Exception 
al contact phases. 
Diop- 
side. 
H. 
I. 
J. 
K. 
L. 
M. 
N. 
O. 
P- 
Si02- . 
50.73 
14.63 
11.51 
52.00 
9.32 
5.08 
57.05 
9.86 
3.10 
11.31 
1.64 
4.75 
2.38 
2.02 
6.20 
4.08 
l.Od 
""2." 4l' 

45. 03 
1.115 
IS. 22 
"2.' 38' 
.35 
14.99 
1.65 
.72 
4.09 
.64 
9 34 
.10 
75. 16 
2.39 
"i.'97 " 
"".'074' 
51 72 
A1203 
1.99 
Fe 2 3 
3 30 
Fe 
FeO.._. 
1.13 
0. 36 
1.24 
2.02 
4.24 
7.03 
.32 
.21 
.01 
2.41 
9.40 
14.47 
1.94 
1.41 
3. 30 
.12 
.(.3 
None. 
1.80 
8.16 
8.61 
4.30 
1.56 
A3 
1.74 
None. 
2.55 
.41 
42.57 
.12 
.25 
1.43 
2.36 
32.30 
.02 
None. 
.45 
48.80 
4.95 
MgO . 
15 08 
CaO 
23 22 
Na 2 
05 
K 2 
.06 
H2O + 
2.07 
.03 
"".02 
.50 
P2O5 
C0 2 
BaO 
None. 
MnO 
.04 
99.43 
100. 08 
100. 20 
99.71 
99.49 
100. 91 
A. Specimen No. 46319. Unaltered blue limestone west of Three Peaks. Analysis by R. D. Hall, 
University of Wisconsin. 
B. Specimen No. 46375. Unaltered blue limestone from Desert Mound. Analysis by R. D. Hall, 
University of Wisconsin. 
C. Unaltered limestone from Iron Mountain. Analysis by Fred Lerch, Biwabik, Minn. 
D. Specimen No. 46123. Unaltered blue limestone. Partial analysis by George Steiger, U. S. Geol. 
Survey. 
E. Specimen No. 46121. Unaltered blue limestone. Partial analysis by George Steiger, U. S. Geol. 
Survey. 
F. Specimen No. 46319A. White limestone west of Three Peaks. Analysis by Fred Lerch, Biwabik, 
Minn. 
G. Specimen No. 46325. White limestone west of Three Peaks. Analysis by Fred Lerch, Biwabik 
Minn. 
H. Specimen No. 46338. Altered limestone between ore and andesite on Lindsay Hill. Analysis by 
R. D. Hall, University of Wisconsin. 
I. Specimen No. 46349. Altered limestone between ore and unaltered blue limestone at Desert Mound. 
Analysis by R. D. Hall, University of Wisconsin. 
J. Specimen No. 46370. Altered limestone between ore and andesite at Desert Mound. Analysis 
by R. D. Hall, University of Wisconsin. 
K. Specimen No. 46437. Recrystallized limestone in vein a few feet thick at andesite contact, show- 
ing partial replacement by iron and silica. From Boston claim. Analysis by R. D. Hall, University 
of Wisconsin. 
L. Specimen No. 46320. Recrystallized limestone impregnated with limonite, in vein near andesite- 
limestone contact west of Three Peaks. Analysis by R. D. Hall, University of Wisconsin. 
M. Specimen No. 46321. Same as L. Analysis by Fred Lerch, Biwabik, Minn. 
N. Specimen No. 46438. Same as K, showing a further stage in replacement by iron and silica. 
Analysis by R. D. Hall, University of Wisconsin. 
O. Specimen No. 46326. Siliceous platy alteration phase of limestone west of Three Peaks. Analy- 
sis by Fred Lerch, Biwabik, Minn. 
P. Specimen No. 46478, Diopside from long tunnel on Dear claim. Analy S- by R. D. Hall, Uni- 
versity of Wisconsin. ,- 
