The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1908-01-28
Mines and Mining Stocks

way laid with 65-pound steel About "a
miles OF additional trackage is now under
| construction and when completed, will
make available dumping room for the
stripping from about forty-five acres of
ore.
The machine shop is thoroughly mod
/ ern in all its appointments containing To-
| conceive pits and machinery capable OF
| handling the heaviest locomotive work
and all facilities for making repairs on
| locomotives and steam shoveis.
The compressor plant consists of a BOO
horsepower electrically operated Nord-
In addition to the above, there are
4 commOdious offices and quarters for en-
| ployes, and all the minor equipment usual
to well equipped mine.
Operations for the Year Ending July
I, 1907.
The Garfield plant did not begin its
| operations until in June of 1907, and too
1 late IN that month for any of its results
| to be represented in the annual balance
| to start on the first of March, but was
delayed on account of the non-completion
| of transportation facilities
The tonnage for the year, for the Cop
perton plant, was mined entirely from
| underground. and consequently had no
advantage from cheaper steam shovel
mining. The CoppertOn plant was served
throughout the year by the Copper Belt
railroad, and suffered seriously from the
failure of the railroad to deliver suffi-
cient tonnage. This deficiency amounts.
from August 1906. until April, 1867. inclu-
sive. to $4,000 tons of ore, or approx
mately so per cent of the tonnage the
plant actually received and treated As
the plant was in continuous operation,
! this additional tonnage could have been
treated with very little added cost other
than the cost of mining and transporta-
uon, and the consequent deficiency in
earnings was very large as the price of
copper for those months was high.
careful estimate of the amount of re-
sultant deficiency in earnings indicates
that, had the Copperton plant been able
to operate at its fun capacity for the
period, the earnings would have been in
creased by something over S370000. Since
ne close of the fiscal year the Copper
ton plant has been equipped with cleo
tTical power, and connected by trans
mission line with the power plant at Car
field-this transmission line being also
extended to the mine, to supply power
At the close of the fiscal year four
units of the Garfield plant We're complet-
day at that plant although we did not
succeed IN putting that number of units
into commission until August Since that
time four additional units eight in alb
having a combined capacity of 1900 tons
per day, have been put into commission
and are now running.
Description of the Garfield Plant.
tons per day, is constructed of steel and
concrete, in twelve complete sections Of
900 tons each. These sections are pro-
Vlded with Independent driving motors
so that the operation of one section does
not depend on the others in any way
Inc general dimensions of the main build.
ing are 500 feet by 50S feet
Generally speaking. the plant is df-
v1ded into three departments: Coarse
crushing, fine crushing and concentrat-
ing. The coarse crushing department
consists of two sections, of capacity of
1900 tons each in sixteen hours. Each
coarse crushing section Is equipped with
Two No. ~ gyratory crushers and two
54-lnch diameter by 20-inch face belted
crushed dry to 24-inch size. The fine
crushing department contains thirty-six
6-1oOt Gillian mills. and twenty-fOur &c.
men diameter by 16-inch face belted rolls
In this department the ore is crushed
wet to 40 mesh. The concentrating de-
partment contains seventy-two single two
compartment 20-inch by 30-inch Hartz
1igs, forty-eight Whitley tables and 1O4
6-foot vanners. of the suspended type. to-
getheT with necessary elevators classi-
fiers and settling tanks. There are twen-
ty-four four-compartment classifiers. and
5S4 9-foot conlcai settling tanks This de-
partment is arranged in three levels. all
similar IN their general design. and diff |
ferlng IN operation only in the different
Quoted to them The concentrating ma |
chlneTy IS all set on reinforced concrete
floors, which are in turn supported on |
steel columns, so that all tailings and
concentrate launders are carried below
the floors. The total area of concrete
floor Is slightly over five and one-haIf !
acres. The total area covered by main
mill building and ore bins is apprOxi- |
mately seven acres and the total foOr |
area III the main building in excess of |
eight acres.
The receiving bin. into which ores are
delivered from bottom dump railroad /
cars. has a capacity of 5000 tons. The |
receiving bin for coarse crushed ore ap-
proXimatelv. 1900 tons-a total storage !
capacity of 10000 tons or about a seven |
davs' supply for the plant
Water is supplied to the mill from q /
o.oOJVB-2aliOn concrete reservoir. located /
at an elevation higher than the plant |
Water Is pumped to this reservoir from /
the springs near the power plant Some /
additional supply will he taken from the |
Garfield Water company conduit and pipe /
lines when the plant is in full opera
The plant IS equipped with shops ade-
quate for all kinds of repairs.
Power Plant.
The power plant has a boiler capacity
OF 12,De0 horsepower, made up OF water
tube boilers, of 6OO-horsepower each set
in pairs. Generating equipment consists
of five croSs-cOmpound eondensing en-
gines, two of 1.200 kilowatts EACH and
three of 1900 kilOWatts each. all direct
connected to 1O9-revoUtion 4,000-volt al
tSiHdlliB current generators current is |
to the mill at the generator !
potential, and transformed to l40 volts,
for distribution about the plant
The transmission line to Bingham is !
supported on steel towers, spaced 400 feet
apart. and the conductors are stranded |
copper cable. The current is transmitted /
at 10000 volts and transformed at the
Copperton mill and the mine, to 44O volts
for use
General Remarks.
% The opara flor, Of III,
to the present time has fully proved the
accuracy of the previous estimates al
though operations cannot reach their
maximum for some time to come At this
time the company is producing at the rate
Of 100000 pounds of copper per month
at cost of less than St5 cents per pound
average, for both plants. OF this output
approximately four-fifths IS coming from
the Garfield plant. at a cost under 3
cents per pound. Our experience in min
ing by steam shovel has proven that our
mining costs should not exceed 25 cents
per ton The Garfield plant is showing
results as above, Notwithstanding the
fact that the ore it is now receiving
and will continue to receive for some
months to come. is partially oxidized and
lower grade than q