The San Francisco call. [volume] (San Francisco [Calif.]) 1895-1913, 1895-12-08
then be the floor for the work and breast

then be the floor for the work and breast
ing out will next be in order.
The richness of the main channels of the
divide at Bath and Forest Hill, considered
with the richness OF the bench and rim
deposits of Yankee Jims and Todds Val
lev, Justify the conclusion that extremely
rich and extensive channel deposits exist
westerly from the last-named two places.
Both at Yankee Jims and Todds Valley
the inward pitch of the rims is compare
lively light, making possible the rim and
bench deposits to greater extent than
found either above or below. Compare
lively little mining has been done, and all
of the main channel is untouched ground
for at least six miles. The mines for the
DEVELOPMENT and exploitation of which
the new Gray Eagle tunnel is projected are
the GRAY Eagle, Wolverine, Clark and the
Mountain. the three last named being
bonded to the Gray Eagle. The Spring
Garden NAV also be worked to some ex-
tent, but how much is quite doubtful, as it
is downstream.
At the only point at which the main
channel has been opened it is $50 feet wide.
From a careful survey of the portions
opened it seems to be narrow place. The
bottom is very irregular, the grade is con-
siderable and very shallow. Gravel de-
posts are frequent. AT the upstream end
there are indications OF turn eastward in
the bed, with increased width and lessened
grades to the channel, which seems to be
the lower continuation OF the rich May
flower and Paragon channels, and that
exposed by the mining in the Darda-
nelles. The mean width of the channels of
these three noted mines, as verified by the
opening in the Gray Eagle, is about 125
feet of workable gravel. The mean depth
OF gravel that is drifted out in all of these
drift mines of the Forest Hill divide is six
a.. tad
mel at 10000 feet, its average width rs feet
and its workable depth feet the total of
main channel gravels should be 4,5OO, 900
cubic feet, which, at the lowest average of
that taken out the past three weeks, should
represent about 100000.
That this gravel may be profitably
mined the new lower tunnel has been
undertaken. Commencing at point
about 5000 feet below the present opening
on Owl Creek, the new work will be COM
menced and pushed along the bedrock
surface, connecting with the abandoned in
cline, thus draining the whole. The
length of the tunnel from the entrance on
Owl Creek to the foot,o the incline will be
about 1900 feet. The difference of eleva-
ton between the entrance of the proposed
tunnel and the loot of the slope from the
twenty-elght feet, with a grade of
about five inches to the 100 feet.
The tunnel will be eight feet in width
and seven feet high. The profile of the
tunnel line presents two depressions in the
surface from which shafts can be sunk,
giving five possible headings for stimuli
famous construction. The first shaft will
be 60 feet deep and 1000 feet in from the
tunnel entrance. The second shaft will be
100 feet deep and in 1850 feet from the en-
trance. The saving in cost of ventilation
will pay for one OF the shafts. The present
tunnel of the Gray Eagle furnishes steady
water supply, amounting to forty inches,
Immediately adjacent to the entrance of
the proposed tunnel, and as the can
yon of Owl Greek falls over
1000 feet (the upper 500 feet
very precipitously) the quantity of
water and bar fall available will give any
desired horsepower up to 100, which by
electrical transmission will furnish all the
power required for machine drills and for
running the train of cars in and out the
tunnel. Thus equipped the Gray Eagle
properties Will be unsurpassed in all the
mining regions of this State.
The mills at the Gray Eagle are to start
up this week and will probably be kept in
operation continuously from this time on.
These operations of the past week but con-
firm the recent rich findings, which fact
has encouraged the company to make the
extensive improve ments reported.