The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1918-06-06
GEOLOGICAL REPORT ON
EAST CALEDONIA MINES
OSCAR n. HERSHEY FINDS CON.
DlTIoNS FAVORABLE FOR
VALUABLE DEPOSITS.

Mr.. Oscar H. Hershey, the wei
known geologist of the staff of the
Bunker Hill & Sullivan NJ. & C. com.
pany, has recently made a geological
study Of the property of the East
Caledonia Mines company and made a
report to the company which is ex-
tremely gratifying.
Mr.. Hershey's report indicates a
very close study of the formations as
disclosed in the workings of the com :
pany and contains much Of general
information regarding geological con :
ditions of the Wardner district.
The chief feature of value in the
property Mr.. Hershey finds to be the
ore showing on the 4OO-foot level. OF
this he says:
Extracts From Report.
Il have already stated that in dry-
ing westward on the Heating fault
on the 4OO-foot level, ore was found in
a vein under the fault The ore
piled on the dump consists of a pale
greenisl yellow sericitic quartzite
brecciated and largely recemented by
fine grained galena. Locally, how
ever, there is white vein quartz and
siderite with which there is associat-
ed pale brown sphalerite, traverseG
by seams of fine grained galena. This
rock has rough ribbon structure. A
little pyrite appears between some of
the ribbons However, the predom-
iEant mineral in the ore is the fine
grained galena and, based upon its
appearance, | suppose it to be fairly
high grade ore
1.-THE first bunch is described by Mr..
Ruch as lens of high grade ore 20
feet long, 6 to feet wide in the CEN
ter that extended Is feet above the
tunnel floor and II feet on the dip
below the floor where there remains
IL to Is inches of ore for a length of
feet. The underhand stope is fun
of water. l can see that this lens
was a segmant of vein striking a
little north of west and dipping
northward 40 degrees. 1t was cut off
on the east by the Heating fault and
on the west by a vertical fault that
strikes northwest. There lis a weaker
band of ore short distance above
that mined and it also dips northward
Beyond the vertical fault several seq
ments of ore bands much lower in
grade than that mined, may be seen.
One exposed ON the left will of the
the main band. 1t is 20 inches thick
and dips northeast so degrees 1t
runs against a fault that dips west
ward .55 degrees and it has been clear
ly dragged down by this fault.
pointed out to Mr. Ruch that the vein
can be picked up again by driving to-
ward the left or southwark, immed
lately beyond that fault and | recon-
mend that that be done. About 25
feet further west little fault brings
down into the drift weakly mineral
lied band containing galena. This
may be a third band. 1t dips north
ward so degrees. 1t soon passes into
the north wall of the drift
THE discovery of the above des-
cribed ore naturally created consider
able enthusiasm. The shaft was sunk
to below the 600-foot level and the
COO foot level driven. This develops,
for distance of nearly $50 feet, what
l am proposing to call the Six hun
dred fault and VEIN From the ex-
IRENE east end of the drift to a point
$50 feet west of the shaft it is char
acterized by band of dark gray
severely sheared material. to
inches thick, in part converted into
tough fault gouge l to several inches
thick. The adjacent quartzite, in
band several feet thick, is scanned with
quartz, in part stained pale gray ap-
parently by fine grained pyrite only