The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1918-04-04

itable copper. gold and silver values
with further development. Unfortun-
ately these deposits are in such
rugged country and so remote from
railway transportation as TO be I'M
attractive to capital at this time.
Dewey Evergreen Mines.
Northwest of this district about go
miles, and 6 miles east of the railway
terminal at Grangeville in the canyon
of the South Fork of the Clearwater,
there exists an interesting series OF
deposits well worthy OF drill prospect
ing with a view to the probable exist
ence of wide zone of disseminated
copper ore relatively rich in gold va
lues At this point the Clearwater
Copper company erected small test
mill of rs tons daily capacity during
the past season for the purpose of de-
termining the savable gold values in
the deposit In addition to the Clear
water company's Dewey group. the
adjoining Evergreen and Atlanta
groups, the Wallace and Marian
groups, whose combined claims cover
zone of very closely schisted green
stone with thin vertical cleavage lines,
shows several wide bands of copper
carbonate and oxide mineral in shall
low development, which are very in
teresting. The only opening at the
drainage level Of the country is on the
Dewey claim. which is driven near the
bottom Of tributary creek that enters
the river at this point. In the portal
Of this tunnel vein 10 feet wide is
richly mineralized with kidneys and
bands of massive chalcopyrite and
bornite ore, and is said to give an
average value of 10 per cent copper
across 10 feet.
The adjoining Evergreen claim is the
most extensively developed of the
group, through the medium Of adit
tunnels and crosscuts in the thin,
highly oxidized schist formation,
which is locally traversed by vertical
diabase dikes on each border of these
bikes for widths varying from to 20
feet. The gold and copper values are
most richly manifested A dump Of
5000 tons of schisty gangue at the
portal of the main tunnel on this prop
erty is said to average $500 per ton
in gold and underground it shows
several zones Of copper carbonate and
black oxide segregations as much as
80 feet wide that are said to average
from l to 6 per cent copper. No at
tempt at deep development has been
made on these properties so far. The
principal outcrops are only 200 feet
above the channel of the Clearwater
river, and present very attractive
chance for churn drill prospecting.
The total shipments from the Ever
green and Dewey properties in crude
ore are reputed to have aggregated
$150,O00, including several carloads
that averaged 500 per ton in gold.
The district is very favorably situated
from a climatic standpoint, with very
little snow in the winter time, as the
elevation is only 1900 feet above sea
level. This property could be readily
made accessible to railway transporta-
ton by the extension of the Clear
water branch Of the Northern Pacific
from Sites, a distance of about IA
miles The edge of the Idaho granite
batholith is exposed about mile east
of this property and in the interven-
ing space a broad zone Of marbelized
limestone occurs, the contact margins
of which are said to carry. some rich
manifestations Of lead-silver ore, The
general geology of these properties is
decidedly favorable and closely COM
parable to the copper sulphide ore oc-
currence in the Snake river canyon.
particularly at Homestead go miles
southwest. and the strike of the zone
Is in that direction. with several in
tervening occurrences of similar ore
Tri Metallic Mine.
The formation to the west Of these
deposits, covering the Camas Prairie
plateau, are Columbia lava flows but
following down the Clearwater canyon
underlying eruptive formations are in
evidence most Of the way for SO miles,
and contain a series of interesting
copper and gold bearing quartz filled
assure vein.
This is typical quartz filled fissure
In eruptive granite or quartz monzan-
lite wills. 1t is from to 10 feet wide,
is being developed by adit tunnels
driven on the course of the vein, one
of which has already attained the
length Of 300 feet, and carries a pay
streak from foot to two feet wide
on one wall and is well sprinkled with
high grade copper minerals, the min
erals being almost exclusively the
higher grade suphides Of copper-bor-
mite and covelite. The only other min
erals exhibited by this interesting vein
are some shallow carbonate and oxide
at the outcrop. The prop
erty is equipped with a small COM
pressor plant is being opened up in an
Intelligent and conservative manner to