332 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
The following samples, C to J, represent altered limestones from 
the Bingham district. Received from S. F. Emmons. Partial analy 
ses by W. F. Hillebrand, record No. 1932. 
C. White altered limestone, Emma mine, west drift. 
D. Same locality as A, gray. 
E. White altered limestone, Highland Boy mine, No. 7 tunnel. 
F. Same locality as C, gray. 
Si0 2 
A1A, Fe 2 
MgO 
CaO 
H 2 
co 2 
PA 
MnO 
c. 
D. 
E. 
F. 
50. 41 
12. 50 
43.40 
4.87 
.30 
1.99 
. 30 
24. 57 
3.66 
1.31 
. 99 
9.74 
48.34 
45. 52 
53.50 
11.81 
4.31 
.23 
1.61 
28.06 
8.28 
39. 32; 
.15 
trace 
.56 
98.59 
99.42 
98.74 
98. 98'j 
G, H, I. Altered limestones from different points on West Mountain. 
J. Altered limestone, Bingham Canyon. 
Si0 2 . 
A1 2 3 
Fe 2 3 
MgO 
CaO. 
HA 
co, . 
MnO 
27.78 
.34 
39.98 
30.76 
98.86 
27.76 
6.09 
38.91 
24.28 
97.04 
34.36 
1.09 
35. 99 
25. 91 
97. 35 
J. 
47.29 
3.46 
22.86 
8.44 
14.04 
1.73 
.28 
.15 
100.08 
"With a little Ti0 2 . 
