The Goldfield news and weekly tribune. [volume] (Goldfield, Nev.) 1911-1947, 1917-09-29
SILvtRM|NES' new MILL
CONTINUED From Page One,

light meter, governing the lighting
load and two motor circuits. No. 1
panel covers the lighting, with
transformer, and lighting is with 60
watt lamps in clusters. In case OF
a shutdown on the alternating cur
rent. a belt can be thrown over to
run on direct current.
Air for the drills is supplied by an
acknowledgement compressor, with
motive power from a 6O-horsepower
gas engine, operating on tops OF
lower gravity than distillate. This
engine will operate seven machines
of the type in use, the Ingersoll jack
hammer, and there is also an auxil-
larry three-drill compressor. The en-
CINE house, containing the hoist and
other machinery, covers 40 by go
feet ground space, is 35 feet high
and constructed of corrugated iron
on structural steel frame.
From the mine the ore and waste
are raised in automatic skips, high
above the collar of the shaft, and
dumped into a 150-ton steel, cone
bottom bin, with separate compart-
ments for ore and waste. The ore
passes through a hopper, over a
grizzly, the fines dropping directly
through a feeder to the main belt
conveyor, while the oversize goes
into the crusher, thence to the con-
veyor and is carried 70 feet on an
incline of about 80 degrees to the
mill-feed bin, similar to the ore-bin.
From this point the crushed prod
uct passes over a short conveyor
to the Chalmers & Williams, 6 by 4
ball mill, using four-inch white iron
balls and driven by a direct 75-
horsepower motor, with short drive
and idler. The ball mill discharges
to a concrete stump, whence the pulp
is raised by elevator to the Dorr
classifiers and two cone classifiers,
the overflow passing to the Dorr
thickeners and the oversize to two
4 by 16-foot tube mills.
From the tube mills the discharge
goes back to elevators and is deliv-
cred to the classifiers, all the over
flow passing to the thickener and
oversize continuing in the circuit,
finally going to Dorr a%gitators. The
system that is practically automatic.
Tests indicate that agitation for 40
hours will be ample, but capacity Is
sufficient to provide ~ hours If
necessary.
The flow in the mill is largely by
gravity, but Gould diaphragm pumps
are used in ~elevating from the thick
eners to the No. l ag%itators. Below
the agitators are a Gould draft
pump, a W~orthington triplex pump,
with universal connection, by means
of which any one of the great tanks
can be emptied into any other, and
a compressor for agitation. Beyond
this is the 40-leaf filtering plant.
The zinc boxes are in the form of
watts. the solution being handled by
gravity. All parts of the mill rest
on solid rock or on concrete foun-
dations.
Complete blacksmith, carpenter
and machine shops have been pro-
vided, as well as timber framing
equipment, a complete assay office,
with motor-driven crushers, ore
scales for weighing custom ore, and
several powerful motor trucks. Oil
storage is provided in large tanks at
a distance from the plant and from
which the supply is delivered by
gravity to the engines. The big
Diesel engine operates on "a gravity
Standard OIL "Calol," while the
hoist and compressor are run on
tops" The company has it's own
telephone line, connecting with the
Goldfield line at Cuprite, 16 miles
distant.
The company's pipe line. drawing
its supply from the main line of the
Goldfield Consolidated Water COM
pany, is of six-inch redwood stave
pipe. bound with galvanized iron
wire. At the lowest point in the
valley there is a stretch of iron
pipe, fitted with expansion joints
and with valves to permit of drain
ing or cleaning any section desired.
With the starting of the mill,
Manager Brady will first put