Tonopah bonanza. [volume] (Butler City [i.e. Butler], Nev.) 1901-1909, 1905-11-04
TONOPAH MINING COMPANY'S NEW MILL
S. A. Worcester Gives a Minute Description
Of it in Mining Journal

uting a number of times, the sands
are finally delivered by the central
%conveyor to a second conveyor which
carries them to a failing stack at the
end of the building, The shines pass.
ing from the fine classifers + first
treated in the two collecting tanks
(36 by 20 ft.) which have circular
launders around their upper edges.
These tanks also have two sets Of
agitator arms on a vertical shaft,
making 5 r. p. m. The nine agitators
in the 36 by 20. foot tanks are driven
by q centrally located 30-h. p. motor,
through a line shaft running over the
center of the tanks; this operates the
agitators by bevel gearing, with a
friction clutch plnion for each
agitator.
Two Sin. pipe lines run over the
nine slime tanks, with valves at each
tank; a 10, in. suction line runs below,
with a valve connecting to each tank.
This suction line connects to an 8 in.
centrifugal pump, driven by a direct
connected 30.h. p, motor. The pump
discharged, into one of the s in. lines
m|entioned) is used for transferring
slime from one tank to another. A
duplicate spare" pump is connected
to the suction and discharge. The
other in. pipe line is connected to
another8-in centrifugal pump, draw
ing solution from any one OF the three
40 by 8 TT. solution tanks. A swing
ing decanter Of 4 in. pipe is arranged
in each slime tank; this is raised and
lowered by a small winch. These
.decauters connect to adm. line lead
ing to the gold tanks. An Sin. pipe
line leads from the slime pump men
toned to the two 40 by 20 #. clarity.
ing tanks, which have bottom dis.
cnarge regulating valves through
which the exhausted slime is drawn
off to the failing dump, while the
clarified solution is decanted and
returned to the gold tanks. A 4 in.
centrifugal pump with individual
motor on base, forces the solution
from the two 30 by s #. tanks to the
sand plant through Ain. lines leading
to the "a teaching tanks. The 8 in.
solution pump also forces solution
to the 20 by 40 battery storage tank
above the mill.
The Is zinc boxes each have seven
compartments, 3 by 3 #. by 2 #. 6 in.
inside. The 20 by 8 #. purifying
tank, with agitator, is used in con.
nection with a filter press and triplex
pump tor purifying solutions. The
rectangular filter tank, of steel, is
used in connection with a belted
vacuum pump for clarifying solutions.
A second triplex pump is provided
with q main pipe, having a number
of short hose lines, for emptying the
zinc boxes. 1t is also used 10 connec-
ton with the acid tank; agitators
in this department are driven from
an overhead line shaft, using a lC
b.. p. induction motor.
The reperberatory drying furnace
with hearth 6 by 10 ft.) and the six
melting furnaces, are to reduce about
30 tons of slime per month. Individ
ual motor drives are used for convey
ors, centrifugal pump, sand pump
sand wheel, e%xcavator and distrib
utor. Three similar motors leach 0
$50 h.. p.) drive the stamp mill anC
the crushing and sampling plant, til,
pumps and and a fargo filter press
AS there r. several motors Of eacl
size used, but few spare parts ar
necessary,
The metallurgical engineering O
this plsnt is in the hands of Godfre,
Devotion; the mill is expected TO b
in operation early in 1906.