KEL.l 
ARIZONA. 
Analyses of limestones from Bisbee district, Arizona. 
87 
Silica (Si0 2 ) ...... 
Alumina (A1 2 3 ) . . 
ron oxide (Fe 2 O a ) 
Ime(CaO) 
Magnesia (MgO) .. 
11.80 
2. 15 
1.08 
45.86 
.48 
12.53 
1.04 
1.26 
27. 28 
17.41 
8.52 
.64 
50.07 
.55 
0.06 
.12 
55. 80 
. L3 
2.52 
.24 
53.68 
.46 
1. Abrigo formation, Cambrian. 
2. Abrigo formation, Cambrian. 
3. Martin formation, Devonian. 
4. Escabrosa formation, Mississippian. 
5. Naco formation, Pennsylvanian. 
Though the Portland-cement industry has not been established in 
Arizona, it seems probable that a cement plant, operated by a Govern- 
ment bureau, will be started there during* 1905. This interesting 
experiment is due to the necessity for procuring large supplies of 
cement, at a low price, for one of the largest of the projected irriga- 
tion dams, to be located in the Salt River Valley. 
A number of raw materials occurring near the dam site were ana- 
yzed, and the results are given in the following table. Of the analyses 
;here quoted, Nos. 1 and 2 represent the limestone and Nos. 6 and 7 
the clay which is to be used at the cement plant. The composition of 
the limestone seems very good; that of the clay is less satisfactory, 
and it will probably be difficult to obtain a slow-setting cement from it. 
Analyses of limestones and shales from Tonto dam site, Arizona. 
Silica (Si0 2 ) 
Alumina ( A1 2 3 ) 
Iron oxide (Fe 2 3 ) . . . 
Lime (CaO) 
Magnesia (MgO) 
Alkalies (K 2 0, Na 2 0) 
Carbon dioxide (C0 2 ) 
Water '.. 
3.30 
.20 
53. 65 
.60 
n. d. 
n. d. 
0.51 
.20 
55. 56 
.10 
n.d. 
43.77 
50.60 
15. 80 
9.30 
4.07 
n. (1. 
n. <1. 
2.80 
55.70 
20.50 
6.61 
n.d. 
n. d. 
11.25 
51. 00 
16. 70 
3.39 
4.58 
n. d. 
n. d. 
20.10 
51.90 
23. 70 
6.10 
.97 
n. d. 
n. d. 
13. 40 
50. 51 
(14.63 
I 5.03 
6.77 
3.00 
5.24 
ll3. 30 
67.90 
|l8. 00 
.97 
n.d. 
n. d. 
1. Limestone near dam site. E. Duryee, analyst. Water Supply Paper No. 73, U. S. G. S., p. 48. 
2. Limestone near dam site. U. S. Geol. Survey Laboratory, analyst. Ibid., p. 49. 
3. Shale near dam site. E. Duryee, analyst. Ibid., p. 48. 
4. Clay 1 mile from dam site. E. Duryee, analyst. Ibid. 
5. Clay from Sallie May Canyon. E. Duryee, analyst. Ibid. 
6. Clay 3 miles north of dam site. E. Duryee, analyst. Ibid. 
7. Clay 3 miles north of dam site. U. S. Geol. Survey Laboratory, analyst. Ibid., p. 49. 
8. Shale from canyon below dam site. E. Duryee, analyst. Ibid., p. 48. 
