The Goldfield news and weekly tribune. [volume] (Goldfield, Nev.) 1911-1947, 1917-09-08
MANHATTAN DEVELOPING
CONTINUED From Page One,

White caps ore gives very gOOu III
dications of what to expect in the
Amalgamated.
The great increase in both size
and richness of the White Caps ore
as demonstrated from the White
Caps deepest workings as compared
with the ore near to the surface
leads close observes 10 have the
greatest confidence in the Amalga-
mated proving to be most valuable
after the present plans have been
consummated and the points reach
ed to pick up the downward extern
sions of the three great ore bodies
already proven in the Earl workings
to a 250-foot depth.
White Caps Mining Company
The preliminary work of the
White Caps mill is proving emil
nently satisfactory to the manage
ment. The one feature which
caused some uneasiness was whe-
Their the temperature of the. rooster
could be regulated exactly and held
at the point where the refractory
elements found in the White Caps
ores would be volatilized without
fusing.
The results have proven that the
temperature of the rooster can be
held within 20 degrees of the point
called for. 1t is officially o
ced that the first test run on a min
us ten mesh product after roasting
and passing through the teaching
plant yielded an absolute extrac-
ton of 81 per cent. With this
knowledge after some changes have
been made in the crushing plant
and by the addition of a trommel
which has already been installed to
regulate the product, without ques-
ton of 80 per cen or better will
be attained in the mill.
1t already has been stated that
the average treatment will be 120
tons tonnage through the mill each
twenty-four hours. 1t has been
proven also hat it takes two hours
for the crushed ore to pass through
the roast, while 70 hours time con-
sumed in the teaching process of
the mill. After the mill has been
in operation for some time, it is
expected that the time of the roast
can be materially reduced.
Following the usual tuning up
process in a new mill these first mill
tests have been run on ores lower
than the average values of the mine
product. 1t is a well recognized
fact in mill practice also that the
higher the grade of ores treated the
higher the extraction. This has
been proven in the laboratory tests
on White Caps ores. The mill tails
remain practically constant in value.
For this reason also it car be fore
casted that a higher extraction on
the average than the present 81 per
cent will be noted when the mill is
running on the regular mine ores,
especially those from the east ore
body from the lower levels of the
mine. One more interesting feature
is the small number of men employ
ed in the mill, a maximum of 10 men
being the total mill crew.
White Caps FIX. and Zanzibar
The Joint shaft of the White
Caps Extension and Zanzibar is still
being lowered in record time. This
is a three-compartment shaft being
sunk for the use of the two COM
panies. 1t has now reached a depth
of 1872 feet and shaft timbers are
all in place. The average speed in
the sinking is still being maintained
at six feet per day, jackhammer
drills being used for the rounds in
the shaft.
. The size of the shaft being brok-
en- is 6 X 16 feet, which means that
575 cubic feet of muck has to be
handled in each days work, an av-
erage of 100 cars of muck being
placed on the waste pile each day.
The Chicago pneumatic air COM
pressor is in place on it's foundations
near the shaft.
This compressor has 314 cubic
feet of air capacity, which will be adj
equate for drill and pump purposes
for a long time in the shaft. The
dwelling house for the mine super
intendent, Ed Haug, is being rushed
to completion by the force of car
penters employed, and the next
building to be raised will be the
hoist and compressor house, to be
35x50 feet dimensions, the lumber
for which is already on the ground.
Manhattan Consolidated
The working shaft of the CONSOLE
dated has now reached a depth of
As feet below the third level, with
timbers in place in the shaft. The
formation encountered in the shaft
is a hard dark blue lime shale. the
soft shale struck at a point 70 feet