Mineral Deposits of Eastern California. — Fairbanks. 151 
position products are the most common. Galena is rarely 
found. The veins appear in all the sedimentary formations of 
the district, namely, limestone, quartzose rocks and schists. 
The gangue of the veins is quartz, while their fissure charac- 
ter is pronounced. 
A similar class of ores is found in the Wild Hose district in 
the northern end of the Panamint range. The deposits are 
scattered over a large extent of country to the almost total 
exclusion of galena and gold. In their distribution they seem 
to bear no relation to the mineralogical character of the coun- 
try rock. 
The character of the deposits in Blind Spring hill, southern 
Mono county, has already been referred to. Although there 
is much galena in some of the veins, the rich ores are stro- 
meyerite and tetrahedrite. Over $4,000,000 has been produced 
here. The hornblende granite within the area of a square 
mile has been badly fractured with the formation of veins 
running in several different directions. 
The silver deposits of Alpine county were formed subse- 
quent to the volcanic activity 7 of Tertiary time. A part of 
them occur in andesite tufas and a part in the more ancient 
crystalline rocks. About Monitor the lavas have been sub- 
ject to the energetic action of mineralizing agents, as shown 
by the extensive areas with brilliant red and yellow surface 
tints. Enargite is the rich silver bearing ore in this district, 
occurring in somewhat bunchy deposits with iron pyrites, 
marcasite and occasionally galena and sphalerite. 
Pyritiferous Mineralization of the Rocks of Eastern 
( A I.I Hi KM A. 
A most striking feature of this region is the wide distribu- 
tion of iron pyrites, its presence being recognized at a dis- 
tance of many miles by the red stains on the rock face- of the 
mountains. Along the mineral belt between Modock and 
Darwin the limestones are more or less stained by iron oxide 
for many miles. The Panamint range, and especially it- 
northern portion, has been subject to intense dynamical ac- 
tion, a fact revealed by the crushed condition of the strata. 
This is well illustrated in Wild Hose canon, where the rocks 
break up into a line rubble. A red color of varying degrees 
of intensity characterizes these rocks over large areas. This 
