The Eureka sentinel. [volume] (Eureka, Nev.) 1902-current, 1910-05-14

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The main difference between the
process as heretofore used, and as 1t
will be used here. Is that in all previous
installations Of this process the ore is
worked in successive charges from one
tank to another. and this successive
charge system involves periodical treat.
ment in the different units of the
cyauiding part Of the mill. The mill
as designed by MI. Kaeding has a con.
tinuous operation from the mill ore
bins to the tailings pile, the pulp hav-
ing q continuous flow through the
various machines of the mill, the tail.
ings being delivered in . continuous
stream to the tailinRs pile. The OBJ.
vious advantage Of such q system is
that the millmen will not be called
upon to watch the various charges to
see that they do not get too long or too
short o treatment. their work consisting
merely In seeing that the various ma.
chimes are kept constantly running
at their proper speed. This will be the
first mill Of this type ever built, but
Mr.. Kaeding has submitted his plans
and ideas TO some of the leading cy q
hide experts Of the country, and they
have unqualifyingly endorsed them.
as the operating cost per ton will be
much less than in the all slime mills as
at present constructed.
The ore as it comes from the tunnel
will be dumped over a grizzly and the
fine ore will drop to the mill bin, the
coarse ore going to the Gates crusher.
and from the crusher to the mill bin.
From the mill bins the ore is fed to
three batterys Of five stamps each.
stamps weighing 1900 pounds each.
Owing to the high freight rates the
company will install but ten of these
stamps now, and add the other five later.
From the stamp battery the ore flows to
a Dorr classifer. this classifer extract.
ing the sands while the fine ore over
flows to q large settling tank.
The sands from the classifier drop to
a five-foot by 1s-foot tube mill and are
here ground fine. and are pumped back
to the Dorr classifier for further CLASH
fcation. The settling tank thus re-
ceives the entire mill product after 1t
has been ground to a slime. Here the
large amount of water with the ore is
reduced by gravity settling. a clear
water overflow being obtained from the
settling tank. This clear water is re-
turned to the mill storage tank to be
used over again. AS the water will &C.
| cumulate o certain amount Of cyanide
in using it,. the ore will really be crushed
in q weak cyanide solution.
A mechanical collector or thickener in
the bottom of the settling tank collects
the thick. settled slime toward the
center, and . centrifugal pump takes 1t
from this point and delivers it to the
Arst of the series Of two tall steel tanks.
Here more cyanide is added and as
much lime as may be necessary to
u~eutralizs the contained acid. and the
whole is agitated continually by means
| Of compressed air introduced at the bot
tom Of the tank. The overflow from
this first tank discharges continuously
to the second tank where the operation
is continued. and the overflow from the
second tank discharges continuously to
an Oliver alter.
This alter 10 . large cylinder covered
with canvas. and it revolves continually
in . tank which 10 filed with the pulp
that discharges from the second agitator.
By means Of . vacuum created on the
inner surface Of the canvas the pulp lie
sucked toward the outsr side and de.
posts q cake Of the dried ore about
three.eiRhths OF an inch thick. The
slow revolution Of the filter drum brings
this adhering cake ont Of the balance OF
the pulp, and after being washed with q
spray Of water the cake. o dried to
about 90 per cent moisture and with all
of the recoverable gold and silver con-
tents extracted, 10 scrapeu OH the o.ner
side of the drum and falls to a continu.
GUS running belt conveyor which de-
livers it to the tailings pile.
The power to run the mill will be
supplied BY a i50.horse power Reynolds.
Corliss steam engine. taking steam from
a battery of two 70.horse power boilers.
Al
The mill and mine buildings and the
tunnel will be lighted by electricity.
The irst teams loaded with machinery
for the mill left Palisade Thursday. and
Mr.. Kaediug and Mr.. Cooper are going
to lay out the mill site Saturday. and
work on the grading will commence
Monday.
E..--y- Dat GlfHrA