El Paso daily herald. (El Paso, Tex.) 1881-1901, 1900-10-05


hand as first-class ore and passed d.
rectly to the furnaces; but most of the
ore occurs disseminated in small par
ticIes through the rock. and must be
subjected to mechanical concentration
preliminary to- its fusion into matte.
Samples are exhibited of the carbon
ateS. suboxides and rich oXy-sulphides
which are passed directly to- the fur
naces. and also of the lean oxysulphide
ores which must be submitted to pre-
Iiminary concentration. 1t will be OBJ
served that the mineral is scattered in
such minute particles through the
rock as to involve extremely fine
crushing to insure its separation. All
the liz tailings are, therefore, recrush-
ed and reconcentrated on vanners.
Hence. as the samples show, the only
tailings which go to waste are the ex-
tremely fine tailings from the van
ners. These ores being acid barren
limestone and barren iron OXIDES, must
be added to the furnace charge. and
the resulting Stag is made as acid as
economy will allow. Roasting is not
needed to prepare the furnace mixture
to yield a so per cent matte for the
Bessemer converter. Lining for the
converter is found in an ore containing
81 per cent of silica. 20 per cent of alu-
nina and per cent of copper. which
ial 70 rthat purpose About 300 tons
per month of such ore are consumed
per converter stand. The gold and
silver contents of the copper are too
low to be always economically extract
ed, but the Bessemer bars when re-
fined by the ordinary furnace method.
yield a copper of high grade. suitable
for rolling. The new cathedral at Ber-
lin is rooted with sheet copper made
from these ores. The unauthorized
sulphide ore commences to occur at
depth from the curface of from 400 to
600 feet and are generally too lean in
copper to be profiatbly treated for that
metal. but they are used by the Ari-
IONA Copper company for the manu-
facture of sulphuric acid.
The United Globe Mines.-The ores
throughout the Globe district, though
rich in copper. are so acid, and profit
able fiux so scarce. that smelling is
conducted under greater disadvantages
than at Bisbee or Clifton and Morenci-
Ii is the only district of Importance
in Arizona, where the furnaces still
yield black copper at SO per cent. di-
rectly from the ores by a single fusion.
The slags from the cupola furnaces
are therefore acid: and like all slags
made from furnaces which produce
metallic copper direct from the ore,
are much richer in copper than those
made from the mating furnaces. The
Globe Stag runs about per cent in
copper. Those made in the Bisbee and
Detroit furnaces run about GA per
cent This great saving in copper COM
pensates to great extent for the eX
ira expense of conducting the pneu-
matte process. The absence of sui
phide ores in Globe. in any large guam
titv forbids its application there
General Statistics.-The present an
nual production of the Copper Queen
mines is approximately 4O.000.0O0
pounds of copper: of the Detroit mine
| Is 900. 900 pounds: of the United Globe
mines. 100000 pounds. The number
vi employees on the three groups of
mines is $500. The coal consumed in |
power is $4,000 tons. and
the coke used in the furnaces $4,000
tons. Both coal and coke come from
the Colorado Fuel and Iron company.
At the Detroit gas engines of the Otto
Grossly and the Westinghous types
are replacing steam engines.
The mating furnaces are water
jacketed cupolaS of 12O inches by AZ
inches at the tuyeres. The converters
are of the barrel type. eight feet long
by five feet six inches in diameter.
There are four mating furnaces and |
four converter stands, with three shells |
TO a stand. at the Copper Queen. four
luItt
stands at the Morenci. and one furnace
at the United Globe. At Morenci there l
is a concentrating mill of a capacity
Of 400 tons n day.
The Copper Queen company built |
and owns the Arizona and Southeast |
ern railroad. a standard guage road |
Of sixty-two miles in length. conect- |
ing the mines with the Southern Pa
cific railroad at Benson. The Detroit |
owns the Morenci Southern
a road of thirty-six inch |
guage and twenty miles in length. |
its mines with the Arizona /
and New Mexico railroad at Guthrie.
The Copper Queen and Detroit COM /
panies have mercantile departments |
and stores at their mines. All three /
support free libraries and |
rooms for their employees. A |
medical staff and well equipped hos
pitfalls exist at all tn establishments
the men contributing monthly from /
their wages for medical and hospital |
services.