The Helena independent., 1894-05-27
REVOLUTION IN MINING.
That VIII he the Eject Of Rsmarka able
New stamp MiiI.

That win lie the Eject Of . Remarkable
New stamp mil.
The u. 3. Public sampllng works 10 nov
equipped with a novel device In ths line Of
quartz mills. IL 10 called the Grimm Cen
trifuRal stamp mill. and is . direct dspar-
ture az regards construction and operation,
from any mill hitherto placed on the
market. 1t involves so radical Q departure
from previous types Of mills that miners
and mill men will watch with interest the
operation OF this new device. The machine
In its essential features consists of cJlin-
drical housing. which provides . seat for
nm annular die placed In . vertical position
within the chamber so formed. The main
shaft revolves In = central position In this
chamber. supported on long sslf-oiling
bearings, which are removed from the
crushing parts and entilely without the
6tied with steel carriers which
carry three series Of stamps. eight In q
80 les. arranged in circular form. Each
series OF stamps 10 free 70 tsvolve on q
loose spindle. The stamps ate driven By
Centrifugal force pRsinsi the hnnular die.
On revolving the msin shaft a. l6O revo-
lutions per minute ths number OF blows
the astonishing figure OF 1900. Each blow
has an impact Of LOO pounds. msintsined
by the centrifugal force Of the revolvisg 9
parts.
In addition to the above mentioned parts
the mill Ia provided with feeder, screen
chutes and oil necessary appurtenanees for
delivering q finished product The Griffu
centrifugal stamp mill has been used most
effectively on quartz ore. copper matte.
and other mAterials. A number arc In op
GRAFTON in the east. and although at the
PRESENT. time the nearest one TO this city.
other than the mill at the samplina works.
is in She state of Idaho. Montana will not
be behind in adopting . device In which 90
much in advance OF she claims Of the man
ufHotuters prove troe.
Either wet or dry crushing is effected In
the snme mill, and 10 Is stated by the man
ufaoturers that from eighty TO one hundred
tons Of ore have been ground In q day. all
10 pass q sixty mech screen. This, with q
smaller consump ption OF power and re-
duced wear and tear over all other mills. in
conjunction With the claim that she prod.
uct 10 OF a more oven grade than In other
methods OF grinding. The facts on which the
manufacturers rely to ssll their msnhinefy.
Mr.. !. X. Griffin, of New York, the i'm
ventor Of this mill. has long bssu favorably
known In the east as an engineer OF ability.
he 10 not unknown TO mining men In this
section. through his previous devices for
the same purpose. a number OF which have
besn fairly successful in the mining nelda
Of the vsst. This new machine 10 she 70.
suit OF his previous efforts md 10 devised
TO remedy defects that occurred In the old
style Of Griffin mills and In all other mills
in which the crushing 10 accomplished By
the use of rolls or bslls revolving against
rings or In grooves
Mr.. J. y. Grifiu hss been In town foi
several weeks arranging for the operation
OF this new mill here. Msssrs. BTadsT
Bros-, OF this eisy, are the representatives,
of the Centrifugal stamp Mill company IL
this part OF the west.