The copper era. (Clifton, Graham County, Ariz.) 1899-1911, 1907-09-12
California Ore Testing Company.

SNihOhh tu VII tSStihS NOuIPuhys
The lack of ore testing facilities
west of Salt Sake City, and the rapid
development of the great mining
regions OF Nevada; have led to the
installation in San Francisco of what
is probably one of the most complete
and elaborate protesting equipments
in America. The purpose of this
plant is to solve problems of ore
trea tment, particularly with refer
ence to the treatment of gold and
silver ores in which cyanidation plays
so important a part. Operations
will be on large scale, and ores will
be worked preferably in carload lots.
But the plant will be in no sense a
custom mill. a detailed report will
be furnished with each test outlining
the proper method of treatment,
with recommendations as to the best
apparatus to adopt. What has hith-
erto discredited protesting plants is
that they have usually been in the
hands of apprentices and chemists
with little or no practical field ex-
perience. Their conclusions are
hardly more than a disconnected re-
port of routine experiments, from
which the mine.owner obtains no
guidance, and little practical infol-
nation. To guard against slovenly
work, the company has secured the
services of Abbot A. Hanks, the
we'll known assayer, and chemist, as
manager, and F. L. Bosqui, as con-
sulting metallurgical engineer.
The plant was designed and in
stalled by the Coast States Construc-
tion company, in consultation with
F. L. Bosbui. 1t is equipped with
laboratory where small tests can be
carried on preliminary to the mill
runs.
The scheme of treatment is as fol-
lows: The ore is delivered to a
Blake crusher and elevated to Sny-
der sampler, the reject being deliv-
cred by Chutes to the bins, the sample
dropping to the samplingfloor, where
it is quartered down for assay.
There are four storage-bins for ore
to be reduced by wet processes, the
two smaller bins to take the oversize
and undersiZe from a shaking screen,
the former passing to crushing rolls.
These small bins, therefore, are set
aside for experiments in dry crushing
away from them the ore may be
trammed direct to the cyanide leach
ing-vats. From the other bins, the
ore may be fed either to rolls, a five
stamp battery, three-stamp bat
terry, or to Huntington mill. There
are three sets of copper amalga-
mated plated plates, from which the
pulp is raised by a sand-pump to a
Callow screen. Directly under the
screen is a double-cone hydraulic
sizer, and by means of the screen and
made preparatory to concentration,
which, bya very flexible system, can
be carried to any one of the three
concentrating machines, namely, d
6foot Frue vanner, an improved card
concentration, and an A. & E. canvas
slime table.
The pulp from the concentrators is
again elevated by pump to Boss
classifier, which separates the pulp
into sand and slime. The sand passes
to the leaching-vats, the slime to a
settling and decanting vat. The
slime is treated by cyanide solution
in an s foot Hendryx agitator, and
passes thence to either the Buffers
or Hendyx yacuum-filter. An Able
Jumbo tube-mill of one-ton capacity
has been installed for fine grinding.
This is charged from the teaching
yats, and the discharge passes to tie
agitator and thence to the vacuum
filter. Suitable water and solution
watts have been provided, and several
individual zinc-boxes for precipita-
ton.
The company has given special at
tention to the type of apparatus in
stalled, and has endangered to make
the plant sufficiently elastic to meet
the widest variations of treatment.
AS the occasion arises, other machin-
cry will be Installed, but the policy
of the management is not to adopt
any new inventions or processes until
long practical demonstration has
proved their value.
The plant is situated on Bay ST.,
near Jones, in San Francisco, and the
Office is at 425 Washington st. All
communications should be addressed
to the office. A descriptive circular
will be furnished on application -
Mining and Scientific Press.
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