The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1914-02-25
CHANGES SYSTEM
Of HANDLING ORES
Interesting Description of
Coarse Crushing Plant at
Utah Copper Mills.

y pamphlet issued DE Nne StcP"eh"
Adamson Manufacturing company gives
a concise and interesting description oi
the coarse crushing plant installed AT inc
Magma mill of the Utah Copper COM
pany. The new installation was mace a'
:. cash outlay OF s156o0o. upon the rec
ommendation of Utah Coppers consult
ing engineer, George O. Bradley, ana mas
changed the system of handling the ores
in the bins. The results have been such
Ms 10 prevent the usual delays In nam
ding the ores during the winter sea
sou. Nhen il freezes, and caused the COM
many TO install similar plant at the
Arthur concentraror. ,
Mountain mine in steel hopper cars OF
100000 pounds capacity eacl, inc pi.is
arc placed on a hillside ana the Taek sri
The cars run over the bins, who're
trainload OF about ten cars at uTne'
and dumped over grizzlies to tne plns.
The mine run ore varies In size oil pieces
from eighteen inches in diameter down
10 dust and the varied sizes are sepa-
ra ted as they fall from the cars INTO Two
series OF bins. The grizzlies are punt up
of heavy railroad rails. spaced about
three inches apart.
Beneath the coarse ore bins are ar
ranged series OF four steel pan convey
run in opposite directions SO that tne
two ut either end travel toward each
,ther. delivering together into the sa me
crusher.
bins To the conveyorS it was impractical
% attempt to control the flow simply by
means OF hand operated gates Inc huSe
lurnps require openings so large that the
,re would rush through uncontrolled and
flood the conveyor. To meet inns ui-
ficuJty 1t was necessary TO use some SORT
of automatic feeder. The type selecled
10 meet these requirements was the steel
apron feeder. One hundred OF these
feeders were necessary under the coarse
ore bins, ra nging In size from 30 inches
by 72-lnch centers. The pan conveyors
handling the lump ore are IS inches wide
by l2-inch pitch. The pans are lined
with 4-inch planks, which act as cnsaons
falling from the feeders. The pan, con-
veyoTs are OF two different lengths to
accommodate te the location OF the gyratory
crushers. Two OF these conVeyorS are
each los feet between centers and the
other two are each 123 feet between
centers. AS the ore is reduced by each
gyratory crusher, IL is discharged ONTO
a pair of 36-nch belt conVeyors, operat-
ing at right angles to the pan conVeyors
and rising on an incline TO position
sbove the fine ore bins.
The fine ore, which passes througn sSo
grizzly bars as it is delivered from the
car, Is Withdrawn also by apron feeders
q nd delivered through chutes TO forty-
two-inch belt conveyors. extending the
structiop of the bins allowed, the apron
feeders were arranged to travel In the
direction of the belt rather than at risht
angles. as in the case OF the pan con.
yeyors Thus, with the assistance or
properly designed chutes. the ore is fed
10 the belt at approximately the belt
speed, eliminating abra sion as far as pos
sible. These belt conveyors deliver CEN
arranged in duplicate and also leading
10 a point above the crushed ore bins
There are thus six conveyors leading UP
10 these bins from the coarse ore bins:
eonvevors is receive ed by thirty-slx-inch
shuttle type conveyor an6 distributed
Into the bins. The shuttle conveyors
consists Of reversible belt conveyors car
ried on ira yelling carriages. which operate
back and forth on tracks above the bins
From these fine ore bins the ore Is
withdrawn by apron feeders. These de-
liver to belt conveyors. which carry the
orc TO the crushing rolls and thence to
the concenrrator as required,
The entire equipment was designed so
as not only to save the Ia Dor OF handling
by cars. but at the same time 10 relieve
the crushers of the burden of Ina ndllng
the fine ore. which formerly clogged and
retarded the crusners, 1t was with this
idea that the ore was arranged 10 be fed
10 the bins over coarse grizzlies and
stored in separate sets of bins. The fines
from the grizzlies do not need further
reduction before reachipg the crushing
rolls. They are consequently conveyed
directly from these bins TO the fine ore
bins on the belt conveyors. This ar
rangement has so increa sed the capacity
OF the coarse crushing plant that con-
templated extra unit of coarse ore
crusherS was eliminated
The length of the ore bins and the
great quantity OF ore TO be handled ne
cesstated Il vast amount Of conveying
equipment. The four forty eight linen
steel pan conveyors. each with q capacity
OF 1000 tons during twenty-four hours.
aggregate s62 feet between centers. 4
battery OF sixty-e eight steel apron feeders.
JhXI2 inches, feeds the ore to these pan
conveyors. and battery OF thirty -elght
::oX42-inch steel apron feeders serves the
bell corvegors. The belt convevors in
The crushing plant include approximately
100 feet OF thirty-inch conveyor 1000
ieet OF thiriy -six-inch conveyor and 200
feet oi forty-two-lncl conVeyor The
belt conveyors are all equipped with spe-
r'ai rubber conveying belt provided with
u heavy rubber cover on the carving
surface style No. Sd carriers are used
Ior the thirty-incl and thirty inch
peits' The iorty-two inch belts are car
ried on fiat carriers