Gilpin observer., 1909-12-30

property. Great solid chunks of
galina, and Jumps of feldspathic rock
Of hundreds Of pounds weight liter
ally sprinkled with free gold. Asked
If it was of common occurrence, the
manager said it happens right along.
The mine is in Prosser gulch and has
been heralded as the terminus of the
Newhouse tunnel AS far as known
the completion Of the now famous
enterprise will in no way affect the
Eureka. The mine Is operated by a
stock company with George w. Mabee
as manager, genial gentleman, and,
as results show, most successful
mining man.
The ore might be called a lead be-
cause it predominates, running from
6 to 60 per cent. The other values
are gold, silver, zinc and copper. The
gold values are from one-half to 2
ounces per ton, that Is, the average
Of the shipping ore; IL to 15 ounces
silver, l to per cent. copper; zinc,
10 to 40 per cent. That must be very
satisfying to the owners. Not for
getting the occasional pockets which
must swell the returns to pretty
large amount. There is a vein on the
west side above the 350-foot level
that averages about 6 feet with ore
stopped running something like SIS
per ton and better. The east end has
four-foot body of ore. Below that
point on the west side of the shaft,
above the 450 to 350-foot level, the
stope will average feet with a
streak on each wall from 1 to 6
inches carrying free gold which will
go to fancy figures. Below the 45O-
foot level no work has been accom-
foot level.
Preparations are being made at the
present time to sink the shaft 200
feet to a body of ore in sight that
the assay value of which is $16.40 in
gold. All drifts both east and west
show a fine crevice in the breast of
each, and no assays have been taken
that have given less result than
$40 per ton from the face of these
drifts. The distance between the eX-
treme west end of the mine and the
east end on the strike of the vein
is $50 feet. About 1000 feet of levels
have been developed during the past
year, and the unwatering Of the
Sierra Madra shaft has also been ac-
lcomplished, in addition, an upraise
was made from the 350-foot level to
connect with the bottom of the Sierra
Madra shaft. This was very i'm
portant undertaking as it practically
ventilates the whole mine. The Sier-
ra Mardra shaft is located 327 feet
west of the Eureka main shaft. In
the development of these levels ore
has been opened almost the entire
distance. From this and what is in
sight, the mine could readily produce
100 tons per day. Much of the rich
ore taken out comes from the 450.
foot stope. The depth of the main
shaft is $40 feet and there are eight
levels leading from 1t.
The mine is only putting out a
limited amount Of ore at present and
this is taken to the Fifty G. NJ. Co.,
mill at Black Hawk. They are, pre-
sumably, I holding back in anticipa-
ton of the erection of their own
mill. The ore is taken down by wag-
on. The west end Of the mine Is
peculiar in that its silver values are
not as high as found in the east
end but contain more gold. There
are at present seventeen men en-
ployed. The mine is we'll equipped
and It's future assured. Judging that
the company will erect a 10-stamp
mill for which ground is being broken.
The Eureka Mill.
The company ten-stamp mill will be
erected 400 feet from the present
working shaft, the conditions being
favorable at that point on account OF
the slope and character suitable for
secure foundation. The plant will be
thoroughly equipped with modern mill
appliances, and have capacity OF
from thirty-five to forty tons In
twenty-four hours. 1t will be electri-
cally driven, and the ore delivered
from the mine cars to 7x10 Blake
crusher, to feeder bins above the
stamps; from there to automatic
Challenge feeders, thence to ten 1880
pound rapid-drop stamps. operating
In single issue motors equipped for
both inside and outside amalgama.
ton. From the motors the ore will
pass over twelve-foot apron plates