The Calumet news. [volume] (Calumet, Mich.) 1907-1938, 1910-12-12

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In the annual report to the share
holders of the Superior & Boston com
pany. Frank H. Probert the consult
ing engineer has the following, rela
tive 10 progress for the fiscal yea
ending September 80:
The exploratory work on the know
commercially mineralized part of tn
claims aggregates 14,734 feet, SIT pc
cent OF which is at the McGaw shat
in the development of the Great East
ern Vein. During the year just end
ed. 3,l3S feet of work was done IRON
the McGaw shaft and 1.173 feet at the
Gardner In addition 10 this. 665 fee
of diamond drilling brings the grand
total for the years development e
4976 feet. This compares favorably
with the 4,462 feet of work at higher
horizons for the proceeding year
shipments were resumed from the
McGaw shaft during February and
suspended late i'm August In all H.
262 dry tons of ore were shipped from
the Great Eastern vein averaging T.
40 per cent copper and 3.57 ounces sill
Yer per ton. while from the old Black
oxide workings 6S1 tons of ore aver
ounces silver were taken out by leas-
ers. The property has produced $780,
225 pounds of copper and 9469S ounces
of silver from 27.126 dry tons of ore
since Superior & Boston was organ
led from an ore body mined above
the sixth level west of the McGaw
shaft. with the exception of the 6S1
tons above referred 10 as being taken
~. II l.. ~ft,r~a
This same ore body is now being de-
veloped at the eighth level. II contin-
ues to the west and has been the main
source Of the ore stopped and smelted
by our neighbors on Arizona Com
mercial ground. other ore bodies as
extensive, and of equal or increased
assay value will be mined from our
lower levels. This statement is based
on the known character Of the vein
and the recent diamond drill develop
ment by the Arizona Commercial Cop
Per company.
McGaw Shaft.
The three compartment McGaw
shaft has reached a vertical depth of
S67 feet, 339 feet having been sunk
during the year. on the sixth level
suitable stations were cut on the north,
south. and east sides. the latter being
for one of the 1000 gallon Prescott
pumps which has been installed. From
the north station a crosscut was sent
out TO explore the Old Dominion vein.
which, at this level was completely
leached. Occasionally copper stain in
the oxidiZed manganiferous vein fill
ing was not considered sufficiently at
tractive 10 justify further exploration
at this level but the development of
this vein will be continued at the pro-
posed 10th level.
The south crOss-cut was driven $50
feet TO the Great Eastern vein. The
vein was followed west TO the proper
~ line and ore of commercial grade
and stopeable width exposed the great
or part of the way. This ore has been
stopped TO the fourth level In south
casterly direction the vein was fol-
lowed 40 feet and showed a very de-
cided Improvement in it's mineralized
Characer TO that of the level above.
The general character of the vein
gives promise of good Slopes from The
eighth and tenth levels to be driven.
II will be remembered that no ore was
found in the south east extension of
the Great Eastern vein. the so-called
Iron Ledge. after the change of course
from the shaft crosscuts on any of the
levels above. so that the sixth level
developments are encouraging.
The two compartment winze from
the fourth level i'm the Great Eastern /
ore body was continued down 10 feet. /
The ore at the bottom was leaner
than I'm the slopes above, but in any
vein mine these local impoverishments /
are TO be anticipated. There is no
question but that on the tenth level a |
high grade glance ore body awaits de-
The seventh level OF the \
Arizona Commercial. which cores /
ponds with our sixth sub-level, was
but a series OF diamond /
drill holes have proven up higher |
grade ore at depth Of from $50 to
] 900 feet. than have been found any
where on the property Cores of glance
ore assaying 10 per cent copper from
a vein Il TO 3 feet wide prove con-
that the richest part Of the
Black Hawk, Great Eastern vein sys-
tenn has yet 10 be mined. These devel-
opments on the neighboring property
within 400 feet Of our line are very
gratifying and should stimulate our ef-
fort 20 get down 20 this horizon. The
Importance Of the results OF diamond
drilling are not 20 be underestimate.
An attempt was made 10 prove the
character Of the Great Eastern vein
Mt greater depth by a diamond drill
hole from the sixth level station OF
the McGaw shaft but owing To large /
belt Of minutely shattered limestone
the work was abandoned.
The last ore obtained showed nuclei I
Of chalcOpyrite in a vein filling Of hem
attic proving conclusively that the /
extensive oxidzed zone is due 10 the
alteration OF cupriferous sulphides.
The same condition was demonstrate |
cd In the diamond drill work at the
Gardner.
Progress in shaft sinking below the
sixth level was slow owing TO the
shattered nature Of the ground passed
through and the water which this zone
held We have. however. successfully
handled the increased flow and today
tho sixth level station pump is not
handling more than IS per cent OF its
capacity.
The eighth level station was cut 26O
feet below the sixth. and south
run to the vein. Drifts east
and west are now being driven (No-
vember, i910) Their faces give prom
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