The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1906-12-30


The accompanying flow sheet dia-
gram illustrates one of the thirteen sec
lions of the, interior arrangements of
euuip,Ylent in the s.000-ton milling plant I
now under construction for the Boston /
Consolidated Mining company at Gar |
field For the drawing illustrating this |
one section of the great mill and the |
description of how the ore Is handled. |
The Herald is indebted to the compa- |
nys expert milling engineer, A. J. Bet |
ties, who planned and who is directing
the building of the works From the
drawing and description of the methods
employed it will be seen that the mill
is as nearly automatic as it. would be
possible TO construct it. There is not
an elevator in the plant The aim mas
been TO have the ore pass on by CRAWL
ty down through the various stages of
concentration until the final separations
are made and the tailings are cast off
and the finished product is deposited
in the. receiving bins.
In addition to the crushers and classi-
hers the main work of the plant is to be
done by 3D. independent Nissen stamps
of LOU pounds each, 2S6 Wiifey tables
and 234 vanners or johnson concentra--
ors, together with 312 cone-snaped set
Ting tanks. each eight feet in diameter
The section here illustrated is calculaJ-
eG to handle approximately 225 tons of
crude ore in twenty-four hours In adj
dition TO the preliminary crushers. etc.
its equipment includes twenty-four
stamps, twenty-five Whitley tables.
eighteen yanners and the classifiers and
settling tanks.
How the Work Is Done.
The railroad tracks from Bingham
run in over the big receiving bins into
which the crude ore is discharged. Two
belt conNeyors running under these bins
for their entire length carries the ore
TO two gyratory crushers 1t passes
from these crushers into two revolving
screens covered with Marconized steel,
the openings in which are ~ inches In
diameter. Everything passing through
these openings passes ON to Two No.
snort gyratOry cruShers.
After passing through the crushers
the material is deposited on the belt
cOnveyors and is carried on an incline
OF 70 degrees up to the top of the bin
designed to receive the crushed orc.
Here it is delivered to another conveyor
running horizontally and az rignt ang:es
TO the other two conveyors. This belt
conveysC is equipped with automatic
trippers which distribute the ore along
The full length of the bin, distance of
about $50 feet. From the bin containing
the crushed ore the rock is fed auto
matically to the Nissen Independent
stamps, by which it is crushed fine
enough to pass through a No. 2S wire
screen. The pulp then passes on to the
classiiers, where it is separated into
| three divisions. The material collected
by the first division or compartment of
| this classifier is delivered to the first
distributor. from which point the ma
! terial goes on to six Wiley tables.
These six tables make q failing which
passes into the general tail launder, the
headwaters passing down to the lower
| line of dewatering tanks. and The con-
eentrates going into a iaunder, from
which it is sluiced into the concentrate
| hin.
The product from the second compart-
ment OF the classifier goes into the sec
| ond distributor, and this product is
treated in a similar manner to that
which leaves the first compartment.
The product from the third compart-
ment of the cla ssifier. passes, down to
| the third distributor. which in turn
feeds six Whitley tables. No finished
product is taken from these six tables
with the exception of the concentrates.
/ All the tailings and aheadwaters' from
| these tables pass down 70 four dewater
ing tanks, and from these the product
is syphoned off and passes on. to a dis
tribntor. where ii is fed to the vanners.
The overflow from the third ,compart-
ilent of this ciassifier passes into sys-
TEN of cone-shaped settling tanks
twelve in number, where the product is
syphoneG from these tanks and passes
into the fourth distributor, which In
turn feeds four Wiley ia bles-
| The concentrates from all these ia
HES pass into the same launder as that
above mentioned The tailings are, car-
lied on to the lower line of slime set
ting tanks, where in turn it Is settled
and syphoned off and delivered to the
lower distributor. which also feeds a
system OF vanners. .,
| As will be noted. the slime settling ca
p5eity of this plant is very large The
clear water from the settling tanks
passes from the settling system to two
pumps, where II is returned to the main
supply reservoir.