The Arizona copper camp., 1917-08-04
MAGMA CHIEF
TUNNEL NEARS
THE BIC LEDGE

The tunnel at Magma Chief is now
in over 1000 feet, having passed
through 800 feet of porphyry, precisely
similar to the porphyry occurring in
the fissure at the famous Magma mine.
Within the next 200 or 300 feet the
tunnel at Magma Chief will intercept
the L. S. & A. ledge, where 1t is the
conviction of the management that an
ore body will be encountered it, in
fact, it is not already found in the
porphyry before the ledge is struck.
The latest report of Superintendent
| Charles A. Kumke to the board of di-
rectors, under date of July 20, follows:
Superior, Arizona, July 20, 1917.
To the Board of Directors of the
Magma Chief Copper Company.
Gentlemen:
The first development and progress
report submitted to you was detailed
report of all operations up to May 8.
1t included the description of all ma
chinery installations, as well as the
actual mining operations.
The survey of the company claims
had been completed, the wagon road
to the mouth of the tunnel was fin
ished, and the Watson tunnel, recon-
mended by Dr. Walter Harvey Weed,
measured just 800 feet on the first Of
May.
Since then our chief object has been
to maintain continuous operation and
advance this tunnel as rapidly as pos
sible Two shifts have been kept at
work, and the average advance per
day for the month of May was eight
and one-half feet. During the month
of June this average per day was
raised to nine and one-half feet, and
up to date, July 20, the average for
July is nine feet.
During this period of nearly three
months no time has been lost on ac-
count of breakdowns or repairs. The
camp was shut down on June 5-Mili-
tary Registration day, and two days,
July and 4, to allow the men TO
participate in the celebration at Su-
perior.
The machinery and all equipment
has been giving entire satisfaction.
AS the Watson tunnel progressed
the fissures became even more prom
inent and pronounced. The filling, or
ledge matter, widened it's preceptibly,
and the solid maganese wall main
tanned it's regularity until the 700foot
point was reached. At this point A
small wedge of porphyry appeared as
filling in the fissure, and gradually it
widened until the entire face was in
porphyry. The entrance of this por-
phyry filling in the Watson fissure is
of great Importance. This porphyry is
altered and full of red iron stain. 1t
shows strong teaching and is cut and
gashed with heavy soft seams of tale.
The tunnel is now in 993 feet and has
been in this porphyry for nearly 300
feet. A close examination and COM
parison of this porphyry with the por-
phyry in the fissure of the Magma
mine shows them to be precisely the
same They show the same red iron
stain and the same alteration and
teaching; and the fact that this same
porphyry carries the ore in the Magma
mine should, with the porphyry en-
tering the Watson fissure, strengthen
the conviction of Magma Chief stock
holders that the Watson fissure will,
ere long, disclose high grade copper
ores. 1t is only a question of 200 or
300 feet more and this tunnel will in
| tercept the L. S. & A. lateral ledge.
The indications for an ore body at this
intersection are excellent. In fact we
are expecting to encounter ore in this
porphyry before we get to this inter
section.
On the far north end of the Magma
Chief property, near the Silver King
holdings, we have started operations
in the old Baltimore tunnel. This tun-
mel, run years ago, is in 800 feet, and
it was the intention in those days to
advance it until it cut the manganese
ledge, which strongly crops on the
surface over this tunnel. Lack of
funds prevented the claim owners
from completing this work. Recently
several manganese experts, securing
the country for manganese deposits,
examined this manganese showing and
very urgently recommended the re-
! sumption of work in the Baltimore
LIFE HEALTH
7 a NJ c =