i6o 
The American Geolonsi. 
Marcfi, lMi>' 
ferriferous developments from serpentine, the richer products 
are also shown to be chromiferous. 
Numerous commercial analyses of the material above de- 
scribed had been made at the instance of the owners. Not- 
withstanding a lack of full description of the samples analyzed, 
the significance of these incomplete analyses, taken together, 
is plain. 
Samples collected at six different points by an English: 
engineer, and by him claimed to represent a seam or belt fif- 
teen to twenty feet in thickness, afforded, upon analysis by 
Dr. Edward Riley, of London, a mean percentage of iron as 
high as 51.110, and of silica as low as 7.410. 
That these samples, while perhaps approximately repre- 
senting concentrations as above described, failed to represent: 
anything like the average composition of the whole fomiatioii 
is sufficiently clear, beyond a doubt, after careful .discrimina- 
tion. 
A series of seventeen partial analyses by Prof. James A, 
Dodge, of the University of Minnesota, however, may be 
assumed to represent several of the more ferriferous types of 
material. Of the number of samples furnished to Prof. Dodge 
by interested parties, nine were products ranging from 49 to 
63 per cent, in iron. The rest of the analyses, though incom- 
plete, indicate clearly enough the character of basic aluminous, 
silicates. The following are the analyses referred to: 
Locations. 
Dudley (hematite) 
Emerson (centrei 
Emerson (top ) 
Beverly (hen^atite) 
(4,68 undet.) 
Magnet 
Stronghold 
Nig'g'er baby (limonite) 
Clayton (magnetite) 
Boyle (hematite) 
Nelson 
Swak 
Haskell 
Mack 
Cle Elum lake 
Iron Yankee 
West Gulch (magnetic) 
Mother Hubbard (magnetic) 
Me- 
tallic. 
Iron. 
63.0s 
57-51 
55-84 
Alu- 
mina. 
2-39 
2.61 
0.84 
2.26 
4.72 
6.01 
15.65 
12. 17 
7-95 
7.71 
6. ig 
I Phos 
Silicaj ]>ho- 
I rus. 
j trace 
11.07 O-06 
13.32 0.05 
6.07 
9-49 
14-3: 
24.98 
43-64 
47.09 
47.40 
37-33 
20 . 89; 
0.01 
0.02 
0.03 
0.25 
0.18 
trace 
o. 16 
0.03 
O. I I 
O.OC) 
0.03 
0.01 
o. 15 
0.91 
Sul- 
phur 
0.04 
0.04 
0.02 
0.01 
0.02 
none 
0.05 
o.oi 
none 
ChO&Mu 
do 
ChO, \r,\ 
ChO 
CaO, Mil 
CrO 
CaO 
ChO 
