The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1898-01-02

Bryan mill or crusher, which consists
4 OF heavy castiron pan with three
rolls, each of 800 pounds weight,
/ driven by proper gearing around q CEN
ter cone at a speed of So times a min
/ ute The ore thus crushed passes
through a f0-mesh screen into lead
boxes, which carries it to the electric
tanks, where the process for the ex-
traction of the metal is completed. At
the mill here under consideration there
I, are ten of these tanks, each eight feet
/ IL diameter and four feet deep, and, as
above stated, receives at each charge
! $500 pounds of quartz. This, with the
proper quantity Of water, makes the
charge that is treated with cyanide and
the electric current from ten to twelve
hours, when the pulp is run to waste,
there having been extracted from it
from Sc to So per cent of its vaiue in
/ gold and silver. Each of the tanks are
lined in the bottom with a solid sheet
] of copper, which reaches to three inches
up the side of the tank. Upon each of
/ these copper bottoms is placed 800
pounds of mercury; also each tank is
( filed by an iron noller or stirrer, which
is made to revoive at a speed of about
% revolutions, keeping the charge in
lively motion This iron stirrer comes
down within about four inches of the
coated copper plate on the bottom of
the tank. The electric current is made
to pass down through the iron post or
shaft that supports the stirrer, thence
through each arm Of the stirrer,
through the pulp to the copper bottom,
thence back to the dynamo, forming the
circuit
The electricity in it's effort to pass
the three or four-inch space that inter-
vened between the arms Of the stirrer
and the copper bottom tank does its
Gil fr hea
precipitated into the mercury, where it
is held fast until q cleanup is made,
which may not occur until after many
days run.
The quicksilver is then drawn off and
goes into a cleanup pan, where IT is
ground until all OF the sand is gotten
rid Of 1t is then drained through suit
able bags, where the amalgam is left.
1t is then now ready for the retort and
the bullion mouldS.
[ cannot enter into details about the
electric plant. for l could not fully COM
prehend all of its details, although Mr..
Ernest Moulton, the mill electrician,
and Mr. R. l. Mason, district electrical
engineer of the Westinghouse Electric
&. Manufacturing company, did all they
could to explain it. Suffice it to say,
there are two dynamos, each of Is
horsepower, 125 volts, compound gen.
orator. furnished and erected by the
said Westinghouse company. One of
the dynamos is used exclusively for the
electric current that is used in the
treatment of ores, and the other for
lighting the mill and premises. The
battery of three boilers will generate
100 horsepower and furnishes steam
to an so horsepower Corliss engine.
Mr. Ed X Kirby has charge of the
mill during its test run. James G.
Forester is the mill superintendent and
William Stetham mine superintendent.
In conclusion 1 viii state that 1 was
highly gratified with the process, and
believe that the ores Of many Of our
mines will be treated by it. L learned
from Mr.. George W. Wilson, the COM
pany's assayer, that he also was highly
gratified with the process.
When it is considered that on Aug. l
there had not been a board or timber
cut for the erection OF this mill plant,
and that if the dynamOs had been
promptly received the mill could have
been started by the last of October,
great energy and promptness is shown.
If at liberty I will have something
more to say about both mill and mines.