The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1900-01-11
REVOLUTION At REPUBLIC.
Assured Overthrow Of Present
Method Of Treating Ore.
JAckLiNo HAS MADE PLEDGES.
Col. Ne II Mars Cyanide Expert
Promises That within the Term
Of Two Years. Contract He Can
save eB Per Cent. Of the Values
OF the Republic Ores, and Reduce
Reduction Cost 90 Per Cent.

Reduction Cost 90 Per Cent.
D. C. Jackling has arrived at Spokane,
on his way to Republic. where ne VIII enter
upon q two years contract with the Re
public Consolidated Company as cyanide
expert. According to the Spokesman-Re-
view he has assured the directors Of the
Republic mine that he can reduce the cost
OF reduction OF the ores Of that mine 66 per
cent and that he can save IS per cent or
the values This is q big promise. but the
Republic owners believe that Mr.. Juckling
can carry 1t out, and his record Is an indi-
cation that the faith OF his new employers
Is not unfounded.
Mr.. Jackling Is considered the foremost
cyanide expert In the country. To his de-
voted EFFORTS through hve years, beginning
ia 1895, Is due the success that has attend
ed the mines operated by Capt. De la Mar
at Mercur. Utah. II has been said Of him
that the great reduction works erected
there are an enduring monument to his skill
and genius as metailurgist. He has
practically made the mines the profit pay
ers they now are.
Expert Description Of the Process.
The process developed by Mr.. Jackling on
such a large scale at Mercur. and which
win be adopted as whole or in part. IL de-
scribed as follows In the recent issue Of the
Engineering and Mining Journal:
From the skip the ore drops on griz-
xlies with 11k-inch openings, fine mate
rial passing to one Of the main ore bins
and coarse to Gates crushers-there are
two OF No. pattern-thence to the same
bin AZ the nne material. There are three
separate bins, for oxidized, mixed and
base ores, with total storage capacity Of
. snan n4~ L.
talccse oxidixed material which Is cal
cined to red heat to drive of water of
hydration, which removes its Elasticity. In
this form 1t is locally styled ''brickified,"
and is rendered readily leachable. The
base ore has 2 to 5 per cent. sulphur and
0.95 to ~ per cent arsenic. and the
roasted calcines have OF to O15 per cent.
arsenic. From the first storage bins each
product is fed to a belt conveyor 100 feet
long These conveyors pass over straight
line dryers. not in commission save when
the ore contains 30 high percentage of
moisture as to render rolling dificult, and
at present no such ore Is produced
1.-THE conveyor delivers the ore to Berthe
let screens, oversize passing to coarse
crushing rolls, thence over a second Berthe
let to finishing rolls. Sizes Of screen mesh
are Y Of an inch for oxidized material, u
inch for mixed and u for base. When
properly sized the oxidixed and mixed
products are dumped into bins direct from
the Berthelets and finishing rolls Oversize
base material from the Berthelets goes
through Gates finishing rolls to elevator.
and Is carried to top Of second storage
bins, passed through revolving sizing
screens one-eighth of an inch mesh-over-
size returned to fine rolls and all base ore
told, there are SIX elevators and six Berthe
let screens The second set of storage
bins, for the sized oxidized. mixed and base
aka - all talI 49, .<x.&~
and each product is still kept separate.
Prepared for the Teaching Tank.
THE mixed ore passes from lower or
second storage bins to belt conveyor rs
feet long, carried to the Holtoff- Wethey
ao sasn o Feet DS ~ ea ssre treats
145 tons in "a hours. consuming eight tons
OF coal. It takes six hours for the ore to
pass through s them; From the cslcinerss
into general storage and mixing bin above
the teaching tanks--500 tons capacity-to-
getfer with the roasted ore. This mixed
now ready for the teaching tanks. Here
Is the first time and place that the ore
Is handled by man since 1t was broken
underground.
From the second storage bin the base
ore passes to elevator, Is elevated so feet,
and Is distributed by a series of pipes to
the new straight-line roasting furnaces of
the Jackling pattern, of which there are
four. and each furnace has separate
feeder. 1t takes about eight hours for the
ore to pass through the furnace, and each
furnace roasts 70 tons In twenty-four hours.
consuming seven tons of coal. The cal
cines are elevated and dumped into the
general charging bin, together with the
oxfdfzed and mixed.
second storage bin to the general charging
bin. In charging the teaching tanks II is
found desirable to first spread about fifty
tons of the cherry oxidized material even
h0tfOn.
inches or SO thick, and afterward the gem
eral product is charged. From this charg-
ing bin the ore is fed into side dumping
ore cars, and these are pushed by men to
the top of the tanks and dumped.
Twenty-Five Teaching Tanks.
There are twenty-five stel teaching
tanks, and by January !, 1900 four more
viii be in commission. Each tank is fifty
deep, and holds $50 tons for a charge of
ore. It takes about eight hours to charge
tank, or a shift of three men.
After tank is charged, the strong So
lutionI.4 per cent. cyanide of potassium,
or eight pounds per ton of water-is turn
s sd on o IRON the bottom through ten two
thoroughly saturated. This operation re-
quires about eight hours, and afterward
1t Is allowed to stand for sixteen hours,
when more of the strong solution is fed
on top and the liquor is drawn off by the
same openings through which 1t was
rst turned on from the bottom In the
gravity, not by pressure other than the
ten-foot head from the solution tanks.
and in the subsequent teaching the flow
is natural discharge. unaided by any
suction of vacuum. The strong solution
Is fed on top for twenty-four hours and
cent. potassium cyanide-which is con-
tinued till the charge is ready for the
wash of clear water. The period of weak
leach varies from two to three days. In
the teaching practice followed the aim is
to have about one inch depth of liquor in
teaching tank pass out each hour, and
the best results follow when the total
weight of strong and weak solutions and
wash water Is double the weight of ore
charge; thus, In handling 700 tons of ore
per diem about 1,400 tons of solution are
precipitated.
after the wash-water is drawn of the
charge is ready for dumping. In dis
charging a tank II takes about four hours
with ten men. The tails are shoveled
through openings in the bottom Of the
tanks into cars directly below. Each
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