Gilpin observer., 1900-06-21
BOSTON AND DENVER NJ. AND II. CO.'S
NEW MILL.


The 80 rapid drop stamp mill of the
Denver q Boston Mining and Milling
company, which has b,en in course of
erection since November last, is com
pleted and was started up for the first
time last week in the presence of several
of the stockholders, who were well salts
fed with the workings. 1t is erected on
the site of the old Bobtail stamp mill.
The old mill was torn down and an en-
tirely new and very substantial four
story building erected. 1t is the best,
most modern and complete mill ever
erected ia Colorado, being furnished
with all thu latest patents and devices
for the economical treatment and saving
of gold of the ore. The building and
plant were designed by Hendrie Il Boil
thoff of Denver, and erected under the
personal supervision of Mr.. BolthoH.
The building is 1S2xl2) feet, is covered
with sheet iron and at one point is 80
feet high. The ore is brought into the
mill by means of cars. A track extend
ing across the upper floor of the mill.
The ore is dumped from the cars on to
grizzlies, 16xlO feet the finer dirt falling
through into bins, and the coarser rock
rolling down on to a platform. On this
platform are four Blake ore crushers,
7x15 feet by which means the c3arse
rock is broken before going into the bins.
The ore bins occupy the third floor of
the mill. There being two sets of bins,
one set of which feeds the automatic ore
feeders, which feed the first or northerly
forty stamps. From the other set of bins
car is filled, the ore from which when
dumped fills the automatic feeders which
keep the remaining stamps running.
On the lower floor the stamp batter
les and automatic ore feeders and an en-
gine room are situated. The feeders keep
the batteries supplied with ore automa-
tically. The stamps weigh 1000 pounds
each, being considerably heavier than
the average mill stamps. The stamps
have a drop of 6 inches and when run to
their full capacity have 90 drops per
minute. They require 800 tons of ore
every "a hours, or tons for each stamp
The manager of the property states that
their mines are fully capable OF furnish
ing ore enough themselves to keep every
thing running. The batteries weigh 5000
pounds each. The batteries rest at the
base on a stone foundation, tho upper
portion of which are heavy timbers bolt
ed together in very secure manner.
The inside Of the batteries contain back
amalgamated copper plates. In front of
the stamps are amalgamated copper
plates, 5Sx16 feet. AT the foot OF these
plates are basins which serve as recepta-
cles for all amalgam or Toured quicksil-
yer which may have washed off the plates.
The engine room on the second floor
contains 60 horse power Chandler &
Taylor engine, which runs the Blake ore
crushers situated on the floor abeve.
On the first floor are the concentrating
tables and the main engine room. There
are "a improved concentrating tables
here, situated directly below the copper
plates Of the batteries. Tho silica after
leaving the concentrating tables is
laundered into the creek on the east side
Of the mill.
The engine room contains Corliss en-
gine and dynamo. The Corliss engine
is of the Sioux City pattern and is of $50
horse power, and is the finest engine in
the county. 1t furnishes the power to
keep the stamps and the concentrating
tables running. The dynamo is OF 800
light capacity, and will be able to light
up the building nicely.
The Colorado & Southern Railroad will
put in side track which will greatly
facilitate the shipping OF concentrates
direct to the valley smelters.
The water supply is ample and comes
through mill race connectedwith Clear
Creek and then by fiume, which empties
into large tank in the northeast end Of
the building. This tank supplies the
water for the mill by means OF a 6-inch
main pipe and 3-inch pipe leading to the
batteries and concentrating tables.
Steam for the several engines is sup.
piled from the boiler room, just above
the mill building. This loom contains
eight boilers, four Of 100 horse power
and four 80 horse power, making com.
bined capacity OF 72o horse power.
Besides building this fine mill the com.
pany also built q tramway track from
their mines to the MILL The track con.
meets with the Cook shaft in the Bob
tail tunnel, where large ore chutes have
been placed from which cars are loaded.
The cars are then brought through the
tunnel, across Gregory street to the old
Smith & Parmalee adit In Bates hill, com.