The Helena independent. [volume] (Helena, Mont.) 1875-1943, 1890-06-18
Invention for Saving Gold.

l ACoAs "O WOAO NAdOAV w RCO U4o tAUSAU VI
the strike.
Invention for Saving Gold.
An invention has just been patented,
which. if it does all that is claimed
for it, will revolutionize the present
system of obtaining gold from the ore.
There is no doubt that Australian, South
American and Californian mining operators
will watch Developments with intense inter
est. Mr.. Mulloy, M. F., claims that by the
use Of electricity he can get from 70 to 80
per cent. of the gold from the rock after
as is now done on account of the mercury
not collecting all the gold and floating off
to the tailings dump.
Mr.. Mulloy's invention is not a substitute
for the stamps but for the plates. As, how
ever, for his purpose, the finer the ore is
crushed the better, be prefers crushing
apparatus consisting of two great rollers
playing in a circular box. The machine
which is to save SO much gold is an iron
disc, spinning in a shallow iron saucerful
of mercury, on the surface of which the
disc floats. In the middle of the disc is an
water and crushed ore descends upon the
mercury. The centrifugal force due Ito the
rotation of the disc drives it from the GEN.
ter to tho rim, pressing it down on the sur
face OF the mercury all the time and insur-
ing that every particle of gold shall be alb
sorbed. 10 prevent any residue being driv-
en- to the edge of the saucer and there
forced from the pressure of the disc and
running off, Mr.. Mulloy places in perma-
nent contact with the mercury solution of
certain salts. This solution is connected
with the positive pole Of battery, the neg
mercury. Under the influence of an cleo
trio current the solution is being con-
stantly decomposed, sending a constant
supply of oxygen into the air and hydrogen
into the mercury. This keeps the mercury
quick" and 1T for work. The solution Of
little ebonite mote within the hopper. A
one-horse power engine suf6ces to drive
both the machine and dynamos required
required for the electrical process and it
can put through ten tons a day. The whole
apparatus weighs only 800 pounds and the
mercury practically lasts forever.
New silver Process.
A great deal of attention is being at
tracted in mining circles to the inven-
ton of Prof. Pearce, of the Argo works,
Denver, Col, for the more economical sep
aration of silver from ores or mates con-
tain ing base metals. Prof. Pearce's repu-
tation as metalurgist and the success he
has achieved in practical way give added
significance to the new process.
The points in the invention which he
claims new are as follows: The process of
separating silver from ore or MATES con-
tanning base metals, which consists in mix
ing with the finely pulverized ore or MATES
quantity of sulphate sodium or potassium
equal to per cent, then roasting the mix
TO obtain the sulphats of silver.
The improved process for separating sill
Yer from copper ores and MATES contain
ing lead, bismuth, antimony, arsenic, or
other Impurities, which process consists in
mixing with the finely p1lverized copper
anlphate of soda or potassa, then roasting
the mixture and finally teaching out by hot
water to obtain the sulphate of silver.
Gold In India
The Mysore Gold Mining company. an
English company operating gold mines in
India, produced gold during the year 1889
to the value of $3.50, Zoo, as against $685., 600
In 1883, the return for November having
been al large AZ $l01 600, and the last
quarter OF the year having amounted to
$4,000, or monthly average of $94, 8333
This product was the result Of sixty stamp
mill. which has since been increased by
fifty stamps. This property during the
past four years just ended has produced
gold to the value of 81. S95OO0.
The Helena Mining Exchange.
The Helena mining exchange will be in
shape for active business about the LIST of
July. The exchange has secured quarters
in the Board of Trade rooms, Power block,
which are being fitted up in handsome
style. A man has been sent for to do the
calling, and the various mining stocks of
Montana will soon have an active market
in Hsleua. It will be good thing for the
state il rightly conducted, and there is no
question about that. There are only about
seventeen shares remaining to be taken.
FoHr of thsss ale for active membership
and twelve nom active.
At the Broad water.
Prof Mowry will give an exhibition At