Gilpin observer., 1898-12-29
The Observer Mi3i39 Department.

centrates. The present number of mer
employed is 100.
The equipments on the surfa ce are by
far the best of any in northern Colorado
both in strength and durability. They
consist of two 60xl6 tubular steel boilers
of l6O horse power capacity. All exhaust
steam from the engines is conducted into
two closed tanks, from which the water
returns to the boilers through Knowles
feed pump. The hoisting engine is oil
the double cylinder, double drum Web.
ster, Lane & Camp pattern) combined
gear and friction type, with 14x14 inch
cylinders, 150 horse power, weight 55,-
900 pounds. The main gear wheel is I
feet in diameter and weighs 5000 pounds;
cut gear, working in rawhide pinion on
the crank shaft, which makes the power.
full machinery almost noiseless while in
motion. The drums are five feet in di
ameter, are grooved for one-inch rope,
and coiled upon them are Roebling's cru
chile cast steel cables of 1900 feet in
length. The drums are SO arranged as
to run independently or at the option of
the operator, and permitting him to raise
or lower with either or both at the same
time. The hoisting speed is about 600
feet per minute. An electric signal ser.
vice enables the engineer to communi-
cate with the fireman or shaft boss at
any time. One drum is employed to
hoist the ore in self-dumping, automatic
ore cage cars. The other drum runs a
large, specially designed iron bucket
which is used in hoisting the waste rock
from the cage shaft. The rock is dumped
into chute and conveyed back into the
worked out ground mined out years ago.
The bucket way is equipped with guides,
the same as the cage way, on which
rests an idler or traveller as they are
termed, which holds the bucket in the
center, preventing it catching or damag-
ing the timbers in the shaft. All signals
in the shaft are given by electricity, on
10-inch single stroke gong.
Two Norwalk 1Gx16 compound air com
pressors, with two 6x12 compressor
tanks on the upper floor of shaft house
and air receivers at the 100 foot levels,
drives the IL air drills used in the mine.
They are OF the Sullivan pattern, each
having a capacity OF driving a drill
through six feet Of rock in ten minutes.
They are great improvement over the
former type of drills used, and much
more expeditions in their work. The
capacity Of a mine where they are used is
only limited by the facilities at hand for
removing the ore and rock from the
Slopes, levels or shaft.
Connected with the plant and on tho
same floor is a high speed Sturtevant
automatic engine, furnishing the power
to drive 4kilowatt 125 volt Akron dy-
namo. which furnishes the light for the
shaft house and stations, also serving to
run circular saw used in forming tim
bers for the mine.
The blacksmith shop is 24x24, vel,
equipped with two forges and a pneu-
matte striking hammer for swagging and
welding drills. This completes the equip
ments on the surface. There is telephone
communication with the general office in
the Equitable building in Denver and
other points.
In managing the property and bring
ing it up to its present well developed
and productive condition, Mr.. Colvin has
been ably assisted by Mr.. Matt Jelinkes,
as underground foreman. The amount
OF work that has been accomplished since
taking hold of the property by Manager
Colvin is surely a record breaker.
The strike Of phenomenally rich ore
made in this mine about II year ago has
been intersected by means of three cross.
cuts into the hanging wall. 1t has.
widened from five to twelve inches and
its continuity proved up for length OF
$50 feet and 10 feet in height. One small
lot OF 320 pounds gave gold values of
sl7,2S9.46 per ton-5S.64 per pound. Any
other lot gave gold values OF over 2.OOCi
ounces per ton, or $4,000 per ton. Boil
OF the above lots OF ore were treated al
Prof. E. E. Burlineames assay anc
chemical laboratory in Denver. Fouf
tons OF ore sold to the State Samplinf
works in Black Hawk gave 81 ,O76 per
ton, which paid all the expenses OF thb
mine for the month OF November, 1s9J.
Another lot OF lower grade ore consisting
OF ten tons gave Al ounces gold, or ah
average of $500 per ton. The stamt
mill ore which is treated at the Randolth
stamp mill in Black Hawk averages five
ounces gold per cord OF eight tons, tie
concentrates bringing $50 per ton. STAMP
mill returns as high rs II ounces pnI