The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1906-08-20
DALY-JUDGE MILL
BEST OF TYPE
Description Given of Park City
Plant of Prominent Min
ing Company.
TWO HUNDRED TONS
TREATED EACH DAY
Average Values of Concentrates
Show Ideal Ores for the
Shelters.

The Daly-Judge mill is Of the side-hill
type. 1t is built in Empire canyon,
about 500 feet from the mouth of the
Daly-Judge tunnel. The mill consists
Of four main floors; the bin floor; the
breaker-roll floor; the jig and Hunting
ton floor; and two table floors, On the
top floor are two ore bins, each of 450
tons capacity, having sloping bottom.
Into one IS dumped the Quincy ore,
from the contact ore bodies, while in
the other is stored ore from the fssure
vein, One kind of ore is treated at
time, says the Engineering and Mining
Journal.
The ore is drawn through rack-and-
plnlon gates to car, is weighed on plat
form scales and is dumped over a griZ-
zly to a Blake crusher. From the
crusher it goes TO the first rolls. These
rolls are fitted with lever carrying
an emery brick, which can be moved SO
as to grind down any corrugation that
is getting too high on the rolls A
sample of the ore is taken by shovel
from the roll-product every Is minutes.
Water having been added, the ore
| then goes to the coarse and next to the
fine rolls, each time the ore finer than
3-mesh being screened out, the final
| oversize from q 2-mesh screen being
sent back to the fine rolls. The ore is
then elevated and passed through So
Ties of trommels IS, and 6-mesh).
Tho oversize Of each trommel goes to a
| three-compartment Harz jig, the fines
from the 6-mesh going to settling
tank, whcrefrom the sands go to two
hree-compartment jigs, while the over
! flow goes to the main settling tank
The jigs all make clean lead product,
which discharges into hopper and is
drawn off in cars on the floor below
and run to the bins, 1t is the intention
OF the company to try treating all
the stuff going to the Harz jigs on q
| three'compartment Wall jig.
Tailings From Jigs.
The tailings from the jigs 20 to a
cup elevator by which they are ele-
waited to a dewatering wheel, designed
by j. D. Fleming. 1t is run
at nine revolutions per minute,
such slow running being essential. The
Fleming wheel rotates in the opposite
direction to the curvature, so that the
sands are pushed out of the water in
stead of being dipped out. The device
work, An S-mesh trommel is used as a
guard after the dewatering wheel, as
some coarse stuff may wash over The
dewatered sands fall into a 50-ton bin
and are delivered by plunger feeders to
three fye~foot Huntington mills, which
have l6-mesh screens, the necessary
water coming from settling tank to
been taken to settle The Huntington
pulp goes to the main settling tank,
which has eleven compartments. Ow,
ing to the fact that the current is CON
hned principally to the V-shaped bot
tom and there is only a slight upward
current to the discharge pipes near the
Top Oh the tank, n very clear water is
Gbt11npd
and other machines to be used as wash
water. The settled and classified sands |
are drawn off through spigots to eight
Wiley tables placed on the upper table |
floor,
The overflow from the end of the
nam classifying tank goes to a smaller |
tan tank which has eight compartments. |
tbn n,s oiSoe Is OF % tne same a general design as
aprons on the side instead of through |
TN pipes. This overflow water, which |
is quite clear, is used over aoain or
else let go to waste, according to the |
amount OF water required in the mill |
me settings from this tank 90 to two
rMMllhey tables and one Wiley sinner.
L Inese make lead product, a blende-
pyrite middling and tails which 90
to the creek ~
The eight Wiley tables treating
SANDS from the main classifying tank
ana the two Wilfeys treating the sands
from the Jlg-water settling tank all pro-
duco a galena- -pyrite product, palena-
R Ryrite- blende middling and failing.
Inc lead product is received into cars,
which are hoisted to the bin tracks
and goes to the bin. The galena-zinc
pyrlte middling goes to Frenier sand
pump, which delivers it to a four.com.
partment settling tank, feeding four
w nMllhey tables on the lower table floor,
Ihese tables give a lead product, a
lplende-pyrlte product and tails. The
!eaa Produet IS elevated in cars and run
to the lead bin. The middhnp is CON
veyed to the zinc pile, where It is held
awaiting favorable market.
Capacity of Mill.
The tails from both the re-treatino
tables and the first ten tables 60 to a
frenler sand pump and are elevated
TO accompaniment settling box.
which feeds three Wiley tables on
the upper table floor. These Wilheys
give lead product, blende.pyrite
mlddllng and tails, which 60 to the
liked, few repairs being required for
them. The mill treats about 200 tons
IN twenty -four hours, and produces |
about forty tons of zinc product and |
forty to fifty tons of lead product. The
lead concentrate averages about 33 per
SonI ieho, zinc, Il IRON, silica, and |
IS,5 ounces silver and oil ounces gold. |
The zinc concentrate averages 2O.25
zinc, 2-4:5 lead, Is iron, 70 silica,
ounces silver and 0.04 ounces gold.
The mill feed averages about 10 per
cent lead, 8 per cent zinc and ounces
silver from the contact deposits, and I
about per cent lead, 5 ounces silver |
and no zinc from the lower fissure de-
poslt These ores are treated separately, {
first one and then, when that bin is
empty, the other. The tails carry or r
per cent lead, 3 per cent zinc and 1.5 /
ounces silver. The mill is run by a L
l4I36 Fraser &, Chalmers Corliss engine, c
making ninety revolutions per minute, i
using steam at about 120 pounds The I
steam is furnished by one 15O-horse h
power marine boiler, two sixty-ho | r
power tubular boilers being held in re- 8
serve The marine boiler is equipped | Il
with an American stokcr and only four T
nT Il