Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1909-04-07
Produces New Device for The
Treatment in Place OF
Stamp Mil.
IS NOW WORKING ON ORES.
mil Dog Mine Near GoldRcld. Nrizoua.
Experimenting ON Its Product
With Now Machine.

Ncw inventions are being made
/ every day FOR the treatment of ore
and among the latest is that Of Julius
/ johnson OF Mesa. Arizona. His MAJ
chine has been covered by many pat
ents during the past two years and
| the machinery is now being given "A
rvout ass TO its advantages. The
model machine which was built by
air Johnson. is being used by the
Shattuck-Nimmo company in its work
az the Bull DOG mine near Goldhold,
Arizona. and is said to be giving SAT-
isfaction, 10 ls declared 70 be much
cheaper and more effoctual than tho
stamp mill
The new machine differs radically
iu principle from the prevailing
stamp mills. the grinding forces be-
ing the centrifugal force impaired 20
the ore by the revolution Of the cyl-
iuder In which &c IS contained and
the action OF q rapidly revolving
smaller drum placed inside the cyl
indcr into which the ore IS fed.
The new machine may be briefly
described as follows: a small clrcu-
lar drum filled with concrete or some
solid material 20 prevent its being
crushed By the impact of the heavy
ore Is placed on a horizontal bearing
The outside surface of this drum is
covered with lengths OF railroad iron
This drum ls TO be reYOlVed az
speed from one 10 three thousand
revolutions per minute outside this
drum. and bearing upon it's upper
circumference. is "a large drum. the
inside Of which was. according "
original spccihcations, covered with
railroad iron However. practise has
shown that the armoring of the out
side drum is unnecessary and in the
future the grinding surface Of the
outer drum viii be left smooth.
CLEARED TO ENGINE.
Motion IS impaired 20 the outer drum
by the friction Of the smaller drum
within. which Is goared directly TO the
engine. the outer drum thus travelling
at a considerably slower rate than the
one within. The ore is fed into the
larger drum and the rate OF revolution
of the entire machine is sufficiently
great 20 throw the material between
the drums at their point Of contact,
Besides being thrown between the
drums the major portion CT the rock rs
finely ground before coming ia contact
with the rollers by impinging upon 9th
err rock I'm the revolving receptacle. AZ
one end OF the outer drum is a fine
mesh screen through which the ground
material viii pass The passage Is Ia
cilitated and the mechanism cooled at
the same time by the passing through
the outer cylinder Of a current OF wa
ter. That portion OF the gold. or con-
ccntraE. which does not pass through
the screen will. because it is OF greater
weight than the rougher material, be-
found iu the coating or the outer drum
and can be secured by the removal OF
the outer cylinder This finely ground
matter also furnishes q grinding sur
face after the machine has been I'm
operation for about one minute by
forming a deposit on the metal inside
surfaces and thus preserving them from
any wear or friction.
SMALL POWER NEEDED.
II IS estimated that the new con-
trivance. equalling in capacity a 100
stamp mill. can be operated by n 30
horse power gasoline engine, since
after the full speed is once attained
the inertia OF the heavy drums tends
10 continue the revolution and very
little power is required to maintain
the speed
In development work the machine
may prove Of especial value since
they are 20 be made OF only one size,
a large one having been found to Doe
no more expensive to manufacture
than one Of smaller capacity. BY
running q shorter or longer time the
new invention can De economically
adapted 90 the needs of any property
which requires from 10 TO 100 stamps
A small plant can thus Increase its
milling capacity without any increase
OF expenditure OF money other than
that required to keep the machinery
in motion The assembling of the
contriyance is complete and 10 can DO
rated into number small
parts, thus making its freiEhtlng
comparatively easy A mechanism ls
provided which automatically regI-
latcs the feed and while in operation
the machine requires very little ate
teutI0n.