Arizona republican. [volume] (Phoenix, Ariz.) 1890-1930, 1903-03-16

it. OF this tonnage about 1900 tons per
day are passed through the concentrat-
ing mills, in addition to which AGO tons
OF mill tailings are reconcentrated
daily, making 1900 tons of material
daily, subjected to mill work. There
are five concentrating millS-four II
Clifton. where the smelters are located,
and one on the Longfellow group. All
of these mills operate on low grade sui
phide ore. excepting one. which runs
On the low grade oxdized and carbon
ate ores. whose concentrates are mixed
with the sulphides in the smelter
charge. The tailings from the oxide
carbonate mill work are passed to the
teaching plant, where an extraction is
made which leaves only one fourth of
per cent. copper in the final tailings Or
waste. The teaching is done by sui
phuric acid. which is manufactured by
an acid plant on the ground that pro-
duceS fourteen tons per day.
The concentrates from the mills
handling sulphde ores will rum about
20 per cent. copper, and these make up
about half of the furnace charge at the
snlelter, the crude ore included COM
prising both sulphides and carbonates,
there being about 100 tons daily Of each.
The = precipitates from the teaching
plant amounting to about ten tons per
day are also added to the furnace
charge.
The smelling plant has five main fur
naces, each 1920 inches in size, the
product from which is q 80 per cent
matte. This matte is passed to q re-
vcrberatory furnace which brings all
the material from the furnaces to q un,-
form degree of heat. and it is then con-
veyed to the co1verters, whose product
is metallic copper, 80 per cent. pure
which goes on the market as Bessemer
copper. There are five stands of con-
verters. each holding seven tons of
metal. Two are always in use, while the
others are given their uuartzite lining
and held in reserve. The plant turns
out copper at the rate of $4,000 tons per
year. The copper makes Il readily sal
able product as it requires &c furtherre-
fining for many purposes III commercial
use There being 70 gold nor silver in
it to recover. it is at once ready for the
market for most purposes.
In the chamber between the furnaces
and the main stack fine dust is COL
lected that carries per, cent. copper.
This dust is mixed with clay in tho
mortar mill and added to the furnace
charge again. The smoke and fumes
from the furnaces pass through the
flues, thence through a 45G-foot tunnel.
in the adjacent mountain. thence out
to the surface through a $50 foot shaft,
with fifty-fcot metal stack at the
surface.
The great blowers are operated by Il
steam engine: the compressed air for
the converters is supplied by two COM
pressors, one being operated by steam
the other by gas engines. Two of the
mills are driven by electric power, two
by gas engines and one by gasoline en-
gines. The large mill at LongfelloW
mine is operated by three 110-H. P.
English made gas engines. the gas for
this fuel supply being manufactured
at gas plants on the ground.
The company employs about 1900 men
In all departments. including the Coro-
nado railroad between Clifton and Met
calf: the Arizona e New Mexico rail-
road. running from Clifton to Lords
burg. therce to Hachita on the FL Paso
& Southwestern, making 107 miles CT
road. James Colquhoun is president Of
The company and for years was active
mana ger. During the past year the ac-
tive Management has been in the hands
of Alex Veitch. y. D. Mclean is super
intendent of the mines in the Metcalt
group, Mr.. Nichols filing that position
on the Longfellow-H Humboldt group.