The weekly miner. [volume] (Butte, Mont.) 1878-1881, 1881-11-15
From Tuesdays Daily
THE PULvERIZER TRIUMPHANT
Paralyzing the Hardest Ores as
Well as It's Detractors. a2at
Destined Probably to Supersede
Stamps-Realizing the Expec-
a@a. .h' tations of It's Friend DIS, ..

iu'iohiZe The crusnlnS OF ores, ana make a
as we'll as a fortune for its creator. On
January Is, 1881, the child was christened
and its name was called the Rowland Pulver.
izer. Strange as it may seem the patent on
this remarkable quartz mill was granted as re-
Gently as the first of the current year, and the
idea itself was conceived and carried into ex-
ecution only two years ago. The success of
the pulverizer in Butte has never been
doubted by the MINER, and has been cn-
tended for by many skilful mechanics and
by MIR. w. E. Hall, who has had charge of
the mill recently operated so successfully at
the Magma Charta works. Since reconstruct
ed by MIR. Rowland, the patentee, and fed
with water from below, through the spout
intended for that purpose, the pulverizer at
the Magma Charta works has been run with
the most perfect ease, and with the most
gratifying results. The ore Was carted in
from the dump, hard and soft all alike, was
fed through the rock breaker into the mill,
and was completely and successfully pulver-
lied, without any picking or roasting, so that
it easily passed through a forty mesh screen,
and thence to the amalgamating tubs. The
capacity of the mill as demonstrated during
the time it was run-from 9 O'Clock Sunday
morning until 8 o'clock last evening-was
20 tons in "a hours, or in other words, he
equivalent Of a twenty-stamp mill, at one
third of the cost of the machinery
and with one-third the expense in
fuel and labor. The operation is
surprisingly simple and is easily understood.
one man feeds it to the Challenge Crusher,
through which it passes to the mill, which is
worked by a ten holse power engine, and pull
verizes the crushed ore simply by skillfll ap-
p~lication Of centrifugal force. Twelve cast
iron rolls move freely side by side
around the exterior of the Muller Plate,
grinding the ore to powder as it is hurled be-
tween them by the centrifugal force. The
machine revolves rapidly, making from 175
to 200 revolutions per minute, using a barrel
of water-which is forced up from beneath
the muller plate and falls over the rolls f.om
above-and passing the powdered ore through
screens, DO or so mesh as desirable--along
with the current of water. So far
only the labor OF one man is needed, and
when it is consid cred by a very sim
pie process the same water which con-
ducts the pulverized ore into the settling
vats is then reconducted through the
mill, its completeness is wonderful.
Thencetol ward the process now used
81 tho NJ,,p, Chorta iS fba ordinary drv-
crushing process. The simplicity and pertec-
ticu of Mr.. Howland's method is illustrated
by the fact that, although the mill uses q ba'-
rel of water a minute, sixty barrels suffice for
its continuous operation, as by an ingenious
system of cups revolving over "a wheel the
same water is conducted from the settling
watts bask into the tank from which it is fed to
the mill. The same flushed severity of de.
tail characterizes the entire process. But
only a practical test and personal examina-
ton will enable one to realize the great re.
suits obtained with so much ease. Let us
look at the facts: One of the Rowland pull
~verizers has been running in Brooklyn, New
York, tor nearly two years, and is now mop
Grafton. This mill dispenses with costly
mills, does away with roasting cylinders and
their cumberous accomplishments, superssde:
stamps, aud with all this, costs colnplete-fol
silver ores-only $500, loaded on the cars
and for gold ores only abou, $4,000. Th'
cost of a twenty. stamp silver mill, which does
as much work as. the pulverizer at an ex
pense two.thirds greater, is 81 OOO at The
: foundry. The s'alnp mill requires at leas
| six or eight cords of wood per day as fuel
the pulverizer can use only from Two t.
three. The stamp mill requires-it the rocA
is broken at the mill-four men, W feeders
a rock ! reaker and an AinAlSalnat"F
l while the Rowland mi | o ly necessitates lh4
l labor of two at most. Fifty or sixty OF lles'
/ pulyerizers have come into successful us'
} during its short career, and there Las iIe'e
been a serious complaint from any o'ller
The experience OF the last two days show
that the principal difficulty with The one II
use a. the Magna Charta was the faulty man
/ ner in which it was put up, tor whl'u, .
course, the efficient gentlemen who Ii We ma
Charge of its operation are not Responsible
As to expense, the stamp mill weighs 4O,ou
pounds, while the pulveriZer weighs onl.
1 1000 pounds. In the Rowland mill til
quicksilver can be used right in the mill It
self, as is done with the one recently set VI
at Black Pine, Idaho. The cost of the cree
ton of the buildings. furnaces. etc, and o
the mill, boilers, engine aud all at RlAcI
Pine was only $4,000. there is not II s!nsl
kew or holt inside tie pulveri7er, nothln'
which can break or wear away, except tn
. cast-iron rollers. which weigh about ski
1 pounds each and can be manufactured ut an
foundry and replaced with perfect ease -
> the use of the Rowland pulverizer an
3 rifles on the Comstock lead, $50 per TOT
4 was saved by concentration from the vast
, alone from the stamp mill. There is II
= doubt that this great invention will eventual
, " revolutionize quartz crushing and will pu
. It into the power of poor men to develop an
reduce their own ores.
:, Owsley Billiard Hall.