Evening capital news. (Boise, Idaho) 1901-1927, 1920-01-04
VOLCANO DISTRICT
GILMORE cOUNTY|s
FORGING TO FRONT
Two Companies 1t Work in Dis
trict on Which : Wonderful
Showing Has Been Made
During Past Year.

what promises to become a mining
camp Of unusual Importance In the near
future, and one which is attracting
considerable attention locally at the
present time ID the Volcano district in
fillmore county.
This district lies chiefly in townships
2 south. range 10 and II east, B. NJ,
about 10 miles southwest Of Hill City
and IS miles east of Boise.
1t was discovered and given its pres
ent name In the early eighties, at the
time Of the Wood river excitement. by
prospectors who were in search OF
high grade shipping orc which was the
only kind that could be handled prof
itably at that time, Many an old
prospect hole Is still in evidence which
shows 1t was gone over quite thorough
In superficial way. and indicates
that they found something to encourage
them.
It occurs IN the southern edge Of the
great Idaho eruptive granite batholite
Geologically 1t Is very definitely relat-
ed to the famous. Butte. Mont, cop
per district, which is situated in
smaller but similar batholite known
as the boulder granite batholite. These
particular sections Of geological struc-
ture in the northwestern states are con-
coded and accepted by our best geolo-'
gists as the primary source and gene
sis Of our most important ore deposits.
This fact alone speaks well for the dis
trict and the limited development to
date bears out the assumption that It
is destined to become an important one.
The district as defined to date is
about two and one-half miles in width
by something like three miles long.
covering a section of low range OF
mountains which have an eastern and
nct< IL tx.As - -
Of about 6000 feet above sea level,
GENERAL FORMATION
The general formation is a monzo-
mite granite interspersed with apalite
dikes following the trend Of the range.
1t Ia thanked on the south by quartz
lite and lime while the lower prairie
land to the north is covered with a
lava flow.
The chief values of the district are
silver associated with copper as a rule,
but in few places with lead. In two
of the properties which have been de-
veloped to some extent. appreciable
gold values occur with depth,
The veins, the cappings of which are
largely quartz are large, strong. well
defined and persistent on the strike.
They show evidence Of frequent fault
ing and dip to the north at from fifty
TO seventy degrees from the horizontal.
MANv IAhG6 OIkES
In addition to the quartz veins there
are several large quartz porphyry bikes
in the district, paralleling and in close
proximity with the larger of the quartz
veins. These quartz porphyry bikes,
all show evidence of naturalization,
and in places carry commercial values
in silver, copper and lead.
The bikes as well as the veins are
heavily charged with iron and manga
nese oxides and at intervals deeply
stained with copper.
The Metals and General Development
company, which Is financed by English
capital have some large holdings in the
district and have within the past year
done considerable preliminary devel-
opnrent with very satisfactory results.
Their force has been reduced to few
men for the winter months. but they
will start some extensive development
in the early spring. Their first work
will be a 1000 foot tunnel which will
cut three Of the larger proven veins
at a depth of 500 feet.
The Alliance Mines company. who
own the Falun group one Of the very
best showings in the district. is now
driving a. cross-cut tunnel which will
develop their main ore body to depth
OF 200 feet. This company IL planning
extensive development for the near fu-
ture.
OTHER PROPERTIES
The Blackstone, Opportunity and
Volcano properties have all been de-
veloped to some extent and each one
makes most promising showing. The
Blackstone vein, which il about feet
wide and carried but few ounces OF
silver on the surface. shows feet of
ore at a depth Of $50 feet. one foot of
which carries ~ ounces silver and
$500 In gold to the ton, with feet
carrying 6.5 ounces silver. $3.50 gold
and LIZ per cent copper to the ton.
These veins and mineral bearing
bikes range in width from four to 60
feet. The district is about 10 miles
from a railroad with excellent truck
roads connecting. Available electric
power near at hand with many natural
ADVANTAGES for economical mining and