The White Pine news. [volume] (Ely, Nev.) 1906-1910, 1907-07-19
LITTLE FLORENCE WORKING
DRY CONCENTRATING MILL.

mill for the concentration OF ore
without the nse of water has just
been erected on the ground of the
Little Florence Mining company
The first runs have been extraordi-
narily successful. and have shown an
adaptability in the dry concentration
which has been denied II for years.
$6240 gave the following results
heads. $62.40: concentrates. $404;
tails. $3.50, or concentration of IS
per cent.
Assay No . on ore containing
large quantities of horn silver In adj
dition TO gold values was as follows:
heads. $327.30: tails. Sal: concen-
trates, Si.ls0O9. or saving of 80
per cent.
Ore assayed by Baverstoek & Sta
piles of Los Angeles gave interesting
returns.
No. /. conglomerate cement, the
average value of which was $3.50 a
ton. was concentrated to $l75.69 a
ton and the tailings gave a trace of
gold.
No. ?. A copper ore from Arizona.
carrying gold and silver. assayed
f-S.Oo WHY
s3.45 after treatment.
In a word. the Shumyaw Dry Con-
cenrator averages concentration of
30 to l. and saves an average of IS
per cent. of all values. The two ia
bles erected on the Little Florence
will maintain a capacity of about
fifty tons day. The mill contains. a
crusher. pulyeriZer, and two Shum-
way tables.
The percentage of saving will av-
erage the same on ore as low as SIS
a ton. which the machine can treat at
profit.
The machine has been perfected
after five years of continuous labor.
and is the invention of DIR. ]. P.
SUBWAY of Los Angeles. assisted by
his SON. Willis NJ Subway.
Ii has taken about $i1 goo to
bring the machine TO its present
point of perfection and to fully pro-
tect it by patents.
Dr. Robinson expresses himself as
being very sanguine of results. and
is a large holder in the Founders
company, owning the patents. \
manufacturing plant will be built in
Los Angeles and working companies
established in Nevada, Arizona.
Utah and Old Merico.
If the concentration proves to be all
ii seems TO be at the present writing
its effect will be incalculable, and the
riddle of the desert has found its an
swer. Low grade mines scattered
like old shoes throughout the desert
states and absolutely valueless I'M
der the present methods of treatment
will enter the ranks of dividend pay
ers. From the assays already taken
one concentration handling twenty
tons of IS ore a day will make a
profit of 500 for every working day.
or 100000 year. On ore of a
higher grade than IS a ton the profit
will be correspondingly greater. and
as it works out on paper il makes the
mouth water.
The principle of the machine is
very simple Ii is made up of two
boxes. of which the tops are closely
woven canvas. The box is filled with
compressed air., under regulated
pressure, which escapes upward
through the canvas. The tables Jig
rapidly within the limits of quarter
OF an inch, and the air current there
fore slightly lifts the waste material
of lighter specific gravity than the
values. which are retained by effect
i've devices.
With the air pressure on. the pulp
appears 10 boil. and as il has been
put through a fifty-mesh screen 1t is
so fine that ii seems almost to flow.
To the touch it has no weight. this
being nearly compensated by the up
ward pressure of the air. and the
sands are jlgged rapidly toward the
discharge end of the tables. The
plant on the Florence cost about
10,000.-Goldfield News.