KAWICH RANGE, ECONOMIC GEOLOGY. 
SILVERBOW 
Silverbow is situated in the canyon of Breen Creek, on the west 
side of Kawich Range, 43 miles north of east of Goldfield. The 
principal prospects are within 3 miles to the east, northeast, and 
northwest of the village. The first locations were made in Novem- 
ber, 1904. When visited by the writer (July 20, 1905) Silverbow 
was the supply center for several hundred men, and a number of 
shallow prospect holes had been sunk. 
The ore deposits lie in rhyolite, which in the vicinity of veins is 
either kaolinized or silicified, the silicification being perhaps more 
common. (See p. 47.) Either type may be intensely stained red, 
brown, or yellow by iron oxides. 
The more important prospects are located on parallel quartz veins 
or lenses, which widen, thin, and in places give out, forming mineral- 
ized bands whose strike in the district is in many cases north of west. 
The individual quartz veins vary in width from a fraction of an inch 
to 5 feet, and many of these are connected by minor cross veins. 
While in some instances the quartz was deposited along premineral 
faults, in others it occurs along joints, which locally form intersect- 
ing systems. Quartz likewise fills many of the spaces caused by 
brecciation and forms in solution cavities in the rhyolite. The 
quartz is, as a rule, white and translucent or colorless and trans- 
parent, although in the Blazier tunnel a single vein of amethyst- 
purple color was noted. A thin section of quartz from the Wheaton 
and McGonagill prospects is a quartz mosaic of very uneven grain. 
In the mosaic are zonally grown crystals of quartz, and finely 
divided silver sulphides dust some of the bands of growth. The 
borders of these quartz crystals appear to be formed of quartz fibers, 
radiating from the center. Crystal-lined vugs are common in this 
vein quartz, and crustification is beautifully developed in many 
specimens, fortification, agate, and mammillary forms being common. 
The quartz is more or less stained by iron salts, rarely by mala- 
chite. In the quartz specks of stephanite, ruby silver, silver chlo- 
ride, and probably other silver ores occur. The si her chloride is at 
least a secondary mineral and to a limited extent is disseminated in 
the country rock. Gold occurs free. Silver is the predominant 
metal, and $1 in gold to $3 in silver is perhaps an average for the 
whole camp, although in some prospects the silver values are 20 times 
those of gold. The ore runs from $6 to $250 per ton, though some 
reports give higher values. Since the writer's visit strikes in which 
gold predominates over silver have been reported. Rarely vahu 
occur in limonite stringers in the country rock, while in several pros- 
pects a greasy crushed rhyolite constitutes the ore. 
The striking similarity between the ore deposits of Silverbow < 
certain of those of Goldfield is worthy of note. Ascending water 
