The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1906-12-24
new METHOD
MAY MEAN MUCH
Dry Concentration in Tintic
Watched With Great
Interest.
WILL WORK MAY DAY ORE
GREAT SAVING IN SILVER VAL
UES WILL BE ACCOMPLISHED.

Through the courtesy Of Carl F. Dietz,
the well known metallurgist who is at
work at the May Day dry concentration,
George NJ. Hayes and C. E. Hush were
shown through that plant, says the Eu-
reka Reporter.
the representatives of the Dietz Engineer
ing company of Boston. which is doing
the work at the May Day mill for the
Cactus Ore company, in which the gen
tlemen are also heavy stockholders,
Messrs. Dietz and keedy came west some
months ago for the purpose of putting up
dry concentrating plant in salt Lake
City. but were unable to secure a desir-
able site for the plant, and having heard
of the May Day concentrating plant, they
came to Eureka TO investigate. Iney
found that some of the machinery in the
May Day mill, which was erected several
years ago by the Crown Milling company
of San Francisco, but which had proven
a failure, could be made to answer their
purpose and as soon as a lease agree
ment could be arranged between the May
Day Mining company and Mr.. Harrell, the
owner of the mill Messrs- DietZ and
Keedy commenced the work OF putting IN
a dry concentratOr that there is every
reason to believe will mean a great deal
for not only the May Day Mining COM
pany and the Tintic district, but the en-
tire west 1t is well known TACT that
with wet concentration il is almost ali
impossibility to make any kind of decent
saving of silver values unless the silver
comes along with the lead In so many
cases the silver is separated from the
lead and the water carries it out along
with the tailings. In dry concentration II
is not so much the saving in water neces-
isary TO operate a wet concentrator, put
the saving of silver values which cannot
be saved any other way About the only
part of the old May Day mill machinery
that will be used when the new process
of Messrs Dietz and Keedy is III opera
ton is the ore crushers and the rolls The
old sizerS, about ten in number, have
been discarded and one sizing machine,
known as the Keedy ore sizef, Will take
the place of all these old machines. The
iKeedy ore sizer is in part an invention
of Dyke V. Keedy, and the one which has
been installed at the May Day mill VIII
have a capacity of between forty ana
fifty tons of ore daily. This will be suf-
ficient for the present, but later perhaps
the capacity will have to be increased.
The Keedy ore siZer has been in use IN
the plant of the Warren Separating COM
ipany at Warren, II. H, for some years,
and has been a success IN every way, Inc
system there being the sarne-that is, the
close sizing and then the Jlgglng (dry) OF
the product of the sizer.
ION the May Day Ores" Mr. Dietz
says, lit is essentially matter of proper
adjustment to suit the conditions produced
by a heavier gangue and lighter mineral
than is the case with sulphideS in quartz.
The nearer the weight of mineral and
gangue approach each other the closer
the sizing must be. and We can resolve
The ore INTO twenty sizes if found desir-
able. instead of ten, with practically no
additional milling cost. This can be done
by running two machines in series or by
constructing one machine to do the work
The machines require no attention when
once adjusted, except occasional greasing,
and consume one horsepower of energy
when under full load and speed and our
smallest sizer handles from forty to fifty
tons per day.
I'VE are adapting dry jlgs to the hand
ling of this ore which are an improve
he, Of sah1 iGhn
reputation in the mining world We Will
also install some dry tables as soon as
the shipment can arrive, and have dry
concentrators of other forms also to test
out against those mentioned"
zone of the essential features is the
dust system, which collects fugitive silver
and lead values liberated during the
crushing This also makes the mill prac-
tically free from dust and there is alb
solutely no danger of being loaded while
working in the mill. The entire system
of crushing is designed to produce the
least possible quantity of shines and IS
known as the gradual reduction method
The ''bag house" into which the dust IS
carried is a feature that was not perfect
ed at the time the Crown Milling COM
pany was experimenting with the May
Day mill. All of the dust is conveyed Dy
pipes TO the bag house." where it settles
"a high grade silver-lead product and is
ready for shipment with the concentrates.
Messrs Dietz and Keedy have already
made sufficient tests to show that their
process emphatically points toward sue
cess
Had it not been for the breaking IN
shipment of some of their machinery and
the difficulty experienced in securing
new parts the dry concentration would
llave been working before this. However,
fit will not be more than a few weeks be-
fore the plant is in successful operation.
AS soon as the dry concentration is IN
successful operation on May Day ores
bit is the intention of Messrs DietZ and
<eedy TO make trial runs entirely sep
arate machines upon ore from other mines
here, as we'll as from several properties
in Arizona and Mexico, where at some
future date similar plants will no doubt
be constructed.