The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1906-12-17
Engineering and Mining Jour
nal Describes Custom Plant
and Its Successes.
WALL JIG DEMONSTRATES
IMPROVEMENT OVER OTHERS
Experimental Plant Yet Always
Open for the Inspection
of Visitors.

The Wall mill is located about in the
center Of the struggling town of Bing
ham, says tho Engineering and Mining
journal. II is a custom mill run by
Col. r. a. Wall, the man who first recog
nized the value of the disseminated cop
per ore in Bingham canyon. and de-
vclopcd the Utah Copper company's orc
body. The mill is run TO accommodate
the small producers in Bingham can"
Won and also as an experimental plant
10 demonstrate the worth of Col. Wall :
new device for orc dressing. One hnds
many novel machines in his mill. Many
OF them have not yet proved valuable,
but his iig. at least, is beginning to
inglv refers to the plant as his "Jim
Crow mill. - Besides his own inven-
tious. it, contains two or three OF hls
foreman S. +. II. Bemis. The Wall lig
has been used At the Cactus, mine, Utah,
replacing the Hancock jig. which was
tried there. 4 Wall Ig has also been
put in the Daly-Judge mill Mt Park
City. Col Wall s table has not rs yet
been tried elsewhere than at his own
mill. but apparently it is doing good
work there.
Col Wall iigs his ore without close
sizing. He has made good saving on
unsizcd orc running from 5.mesh to 200,
shorter stroke required with the fine ore,
and the consequent reduction in capac-
tv, rough sizing is given the over
size. above 5-mesh being treated on ono
iig and the product from 5-mesh 10 80
mesh on other .iigs. The sizes below 30,
mesh are treated upon Whitley and wall
tables working side by side. so they
afford good comparison. Many men
developing new machinery are secrellYc,
but al this mill there is sign posted
M inviting visitors TO come in and look
around. ANY one is at liberty to take
samples of any and all products. The
orc dressed in his mill contains galena
and pvrites. # is hauled in wagons
from different mines and at the mlll is
dumped into 200.ton bin at the top
of the building. The mill is erected on
a hillside and has three main terraces,
viz; the breaker floor, the roll moor,
sud the table and Jig floor, On the
breaker floor are the Blake breaker. the
sizing screen, and the roughing Jig.
The ore ms received from the MINES
is wet and frequently 1T is necessary
to have man in the bin to wash 1t
out with hose, or else 10 shovel ana
push il out From the bin the orc passes
over a grizzly having l-inch openings.
The oversize goes 20 n 9xl5-lnch Blake
breaker. which crushes 1T to about X
inch size. The product from the break
or. together with the undersize of the
grizzly, goes to set of Wall CORFU
gated rolls. This feeds a cross-belt ele-
vator. which delivers to a trommel hay
ing a 5.mcsh No. l. wire) screen. The
oversize from the trommel goes 20 n
three.compartment Wall Jig The tail
ings from this Jig go TO the creek. while
the concentrates 90 TO the bin, The
undersiZe from the trommel goes 10
shaking screen, the invention of Mr..
. l., 0-rf,p pch
wire). 90-mesh (No. 20 wirc), and
30-mesh screen. These screens above the
30-mesh are put in only TO relieve the
30-mesh; otherwise, because OF the small
area Of the screen surface, the 30-mesh
would be overburdeucd, The sizes above
the 30.mesh screen go by means Of
launder 10 hree-compartment iigs, of
which there are two Wall ugs and one
HarZ Jig. fitted with n Wall lever mo.
tion to move the plunger. These ngs
produce lead product and tails which
90 TO the creek.
The undersizc from the 30.mesh
screen goes to four tables, viz: two
Wiley and two Walls. The heads and
middlings from both these tables go 10
the concentrate trough, while the tails
90 10 the creek. The tailings from the
Wall tables and the Wall iigs run about
0.3 per cent lead. Col. Wall SAYS that
the saving Of lead is about 90 per cent.
Some of the pyrite is thrown into the
tails. because the concentrate Of the
ore Of which most is treated fetches the
better price the higher it is in lead.
The first novel thing in the mill is
the Wall rolls These are l6 inches IN
: diameter and have a l6-inch face The
roll faces have spiral corrugations about
. inches deep. the corrugations meshing
together. Col Wall claims that this
gives the rolls larger capacity and re.
duces the percentage of shines. These
rolls were once tried at the old Boston
and Montana concentration ar Butte and
st the Washoc mill Anaconda. and did
indeed give an increased capacity, but
they wore out too fast and there was
trouble with the boxes, owing 10 the
side thrust Col. Wall claims that he
now makes the rolls strong enough to
resist the strain At his mill they have