Elk City mining news. (Elk City, Idaho) 1903-1913, 1904-08-20

course to complicated machinery, Du
by an appeal to simplicity of construc
ton and arrangement.
Before proceeding to give in detail
the CONSTRUCTION and operation OF Thu
experimental plant, it will be of interes
to state that charge of ore from the
Consolidated Mercur gold mines wa'
run through on August l, in the pres
ence of Mr.. George H. Dern, of thai
company. and under the eye of othel
interested persons, affording them graf
ification and surprise at the simplicity
of the method and the results obtained
Seventy-two percent of this charge
was passed through 40 mesh screer
and 55 percent was slime. The eXtrac-
ton was 80 $40 percent; the consump-
ton of cyanide, two-tenths of one pound
to the ton; and the time occupied fol-
the entire treatment, 1S hours.
1t is we'll known that the Consolidated
Mercur ores are among the most Shiny
and refractory of all ores, hence such
results warrant the statement that with
ordinary ores better results can be OBJ
tanned in less time.
GAS it shame indicates the Holderman
patented filter-tank is filter, having
its sides and ends, as we'll as its bottom,
covered with filter fabric, stretched
over A-shaped Stats, giving a percolat-
ing and teaching area equal to the whole
surface of the interior of the tank
The bottom of the tank slopes from
back to front, allowing an easy dis
charge of treated ore through several
front gates. Two, three or more of
these tanks are arranged in stair-like
The uppermost tank is fit
ted with an agitator of simple construc-
ton, towit: a longitudinal revolving
shaft, upon which is set at intervals
blades or paddles. The succeeding tanks
besides being filtered with sides. end
and bottom filters, are provided with
frame filters traversing the interior of
5he tanks from end to end or from back
% front (the latter arrangement pre-
'erred), thus still greatly increasing
he filtering capacity. Each tank is
provided with discharge pipe through
which flows the gold bearing solution
by the interior filters. The
anks should be-for a milling plant
rom II to 20 feet in length, four to five
Get in width and five to eight feet in
epth. Thus three tanks, 5x7x12 ar
anged as above described would give
daily capacity of at least 80 tons.
The ore having been reduced to a fine
ulp, such as may pass 40 mesh or
ner screen, the agitator or upper tank
charged, preferably with the dissoIv-
lg solution; but if with water. this
nay be readily filtered off by opening
he solution discharge pipe, then the
issolving solution may be added either
trough said discharge pipe, thence
rom all sides through filters, or NAV be
dded from above. The solution dis
barge pipe is now closed and the aeita-
or is made to revolve, keeping the
= hole mass in operation from three TO
NIX hours, according to the more or less
ihmlness of the ore under treatment
Then the front gates Of the tank arc
opened, and by means of hose SIM
Piled with a weak solution of wash
water, the charge Of ore or slime &c
readily slulced into the second tank.
eavng the first tank ready for another
charge. Thus with no more effort than
IS required TO direct hose, the first
tank is discharged and washed the GRO
thoroughly turned over, washed and
aerated in transit, and The second tanl,
S charged ready to filter off its 70 Or sO
percent of remaining dissolved values
The third tank repeats the operation Of
The second, taking practically all that
remains of dissolved value, or. AS in +ba
case of the Consolidated Mercur ORC
test this tank being charged with eoual
weight Of pulp and wash water rendor
I'd through its filters Is percent of tbe
in five hours.
Where water is available, the bottom
tank IS easily discharged through its
gates into launders, but where water 10
not so available this tank NAV be enon
ned ID, through bottom discharge gates.
The above described method hav;no
net successfully the mechanical diff
,ullies oil treating shines, the following
special merits are claimed for it:
affords the desired opportunity fo,
me crushing, thus making high extrac
ION possible with short contact of die
solving solution NiS-