Arizona republican., 1915-05-23

gangue and these ore bodies extend
almost to the surface with but little
/ alteration or enrichment. The third
I class of ores are in a quartz and
quartz porphyry gangue and extend
/ to the surface as an iron-stained
quartz cropping. Portions of this
latter class of ore are so silicious
! that it is used for converter flux
! Parts of the oxide ores everything the
pyrites are also sufficiently silicious
! for use as converter fluX. A large
portion Of the old iron sulphide ore
: bodies are in a fire district and are
/ bulkhead off from the remainder of
, the mine. except such portions of the
fire area as is now being worked, as
! described below
! The oXidiZed ores of the outcrop.
which carry high values in gold and
silver, extend to the 16O-ft level
i These are now being mined in an
/ open cut at the top and "milled'
down to the Soft level where small
cars drawn by Jeffrey Atom electric
locomotives take them to a loading
! station at No. shaft. There are B.
deck cages are served by 2Ox4S in
Allis hoist, with flat rope and reel.
which is capable of raising the maxi
mum load from a depth of / 900 feet
1t is also used for the ores recovered
! in the fire zone. The shaft has two
q compartments.
The fire zone" which represents
the older part of the sulphide work
! lngs and some of the slopes of the
: oXodizeG ore area-all lying above the
/ 1OO-ft. leVel-was started by a fire
which broke out nearly IS years ago
]
, ore. being high in sulphur, burns
; easily. 1t is, however, merely self
roasted No copper values are de-
stroyed and air introduced under
pressure not only serves to ventilate
/ the drifts, but also to blow back the
fumes and permit mining in the
Slopes Workings not active are
! bulkheaded off with cement fire walls
/ but have some outlet to the exterior
of the mine, and a quantity of air
1 sutflclent to prevent dangerous ac-
I emulation OF gases is forced in.
/ Doors and curtains are also used in
! the open drifts and at Slope emit
I RANGES and outlets to make the con-
| troll of the air draft effective. Each
stope or any section of il can thus be
segregated and handled as unit.
The fire zone. a whole, is also
wrought as a separate unit of the
mine and operations are carried on
continuously in three shifts. Owing
/ to the precautions taken BY the man
agement and the skill with which the
| air for ventilation is controlled, con
| ditions for the miners are nearly as
comfortable as in the other workings
and practically no more hazardous
/ The overland. square set system is
used, but will be changed over before
/ long. or as soon as the old smelter
everything these ore bodies is re
moved, to the method mentioned be-
low, which prevails in the newer
part of the mine. Compensation al
| lowed the miners is on the straight
S-hour day basis. no contract work
being done in the fire zone.
New fires occasionally break out
but are not troublesome unless they
get into the heavily -timbered section.
Chemical eXtinguishers are freely
provided. and there is a regular fire
fighting force. while the miners are
instructed in emergency measures,
rescue work. etc. Bell signals. flash
signals and warnings by trammers
also provide for getting the miners
away from danger points quickly.
Safety first and then fire extin-
punishment is the rule rigidly fol-
lowed.
In order to facilitate future opera
tions i'll the fire zone lateral draft
has been opened up. on one side,
through the country rock. which
crosscuts to the ore bodies and VEN
tilating shafts raised to the surface.
1t is planned. however, to trip the
waste everything the fire district with
a steam shovel and work this dis
trict, as well as the entire upper
levels and down to a depth of sew
eral hundred feet, with steam
shovel of with a combination of the
steam shovel and mill-hole system.
OXidiZed ore from both the outcrop
and fire zones, after being hoisted at
No. shaft, is dumped to wooden
bins and loaded into ears on 4 track
below, at one side. The bin gates are
lifted by air cylinders.
The principal operations of the
company. however. are in the newer
part of the mine, where levels have
been opened up down to 1900 feet.
with tunnel $500 feet long at the
1OOO-ft. level. The 800. 400 and
SCOTT. levels also the 900. 1000 and
1900, are haulage levels. while the
1850 and 15OO-ft. levels will be. The
total haulage equipment for all mine
operations includes nine Atom. four
6-ton and three 7-ton Jeffrey loco
motives.
On the 500 and 1OO0-ft. levels. the
first two of which are also opened
by adts. there is forced ventilation
by means of Sirocco fans driven by
/ Westinghouse motors Mining in the
upper levels of the new section has
been carried on for some time by top
slicing and filling; but in the lower
workings the shrinkage system is be-
! ing adopted, and st 1900 feet there is
an immense open stope known as the
Hampton. the largest in the state.
In cutting and filling, the ore
bodies are worked on an incline to
eliminate shoveling of the ore and
the handling of the waste in the
stope All stopping is done with