Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-10-30

berg mines, and through the Uncle Sam
aud Hamburg mines further 20 the south
ward. II faults sll formations, but IL IT.
self nowhere faulied or dislocsted so far as
can be determined. IL has been traced
upou the surface and is Identified under
ground by lite filings OF rhyolite, ore,
ledge material and composite OF rhyolfte
and clay, the latter having been produced
By attritiou where the walls are close to-
gether or nearly 10. IL has q most import
ant bearing on the present structure OF
Ruby Hill and the country 10 the south
ward, ss also ON the relation OF the
ore bodies to each other. Throughout its
entire course il is found to be the key to
the structural problem OF the Ruby Hill
and Prospect Mountain minerslized zones.
The country southwest, on the footwall
side of the fault, has been raised several
hundred feet relatively to the hanging
wall. IL is probable that there was up
heavsl and subsistence, but that the latter
exceeded the former. Taken in connection
with all OF the mines to the southeast, IL is
found TO be q fault plane along which the
whole southwestern country has been
raised from 500 to 1000 feet. There can
be no question that the key to the problem
Of deep mining In Ruby bill and Pros
pect Mountain will eventually be found in
the Ruby Hill fault.
The limestone Of Ruby Hill ia divided
into W sections, which we will designate
the 'front.' and 'bsok" limestone. The
latter forms o wedge which, taken through
the Eureka Con. mine, extends from the
surface downward to near the 18th level
end lies between the qusrtzite, the face OF
which has q mean dip OF about 40 degrees,
and the fault assure, which dips at an an
gle OF about 20 degrees. This. which we
shall call the upper wedge, lies on the
southwest or footwsll side OF the assure
and has been raised in this locality about
1,400 feet relatively above the lower wedge
and narrows to a thin edge At Its lower
extremity. 1t is remarkable for Its crushed
and broken condition. II was in this
wedge that ell OF the tremendous ore bod
les which made Ruby Hill famous III the
early days OF the district were mined.
The exploration Of the front limestone,
which o~verlies the fault TO the southwest,
has not been sufficient TO determine
WHISTLER either large deposits or any ore at
all may be found in il. From the narrow
part Of the upper wedge. downward, IS
seen upon the 18th and 14th levels, as we'll
az upon the 1,200-foot crossut from the
IlOCAn HuhIts ptlom Al AFth AVF0A Va hoN
Eureka Con. mine, the face Of the quartz
tie forms the iootwsll OF the fault, the lat
ter maintaining its dip at IN angle OF 70
degrees, the same as ID does above. Below
the 18th level, with its thioest edge upper
most and it's form inverted. IS compared
with the upper wedge. but situated upon
the northeast or hanging wall side OF the
fault IL Q
LOWER OF LIMESTONE
Identical In character with the upper
wedge. This Is crushed and shattered in
precisely the some manner, and, subse
quent to the upheayal and subsistence
along the fault line, was doubtless an un.
divided part Of The block OF limestone
which forms the upper wedge.
The future OF Eureka District will de-
pend largely on deep level mining; not
that the levels near the surface are ex-
hausted Of ore, for on the contrary, there
are hundreds Of the smaller mines and
prospects OF the district capable OF pro-
ducing the precious metals that are seldom
or never talked about; but there Ia no
question of doubt among the experienced
miners who have worked on the deepest
levels Of Ruby Hill that there are bodies
of ore to be found 10 the lower wedge OF
limestone ss valuable az those which
were exoavated in the big chambers OF the
upper wedge.
The exploration OF the lower wedge would
require the expenditure Of large sums OF
money. no doubt-perhaps hundreds OF
thousands, possibly millions Of dollars;
bat when 10 Ia remembered that the Eu-
reka Con. and Richmond mines have alone
paid over ten million dollars 10 dividends
and made . number OF people wealthy,
and when 10 is further borne in mind that
the ore 10 known to enter the lower wedge
OF limestone and to 60 down below any
depth yet attained in Ruby Hill. IL Is not
unreasonable to believe that deeper ex.
ploration In the lower wedge would pay.
The only reason given 70 the public by
the Eureka Consolidated management for
not sinking the LOGAN shaft deeper and
crosscutting to the lode below the LOGAN
1900 foot level. was that the machinery
upon ths LOGAN shaft was inadequate for
the dual requirements OF draining the mine
OF water and raising the material broken
underground to the surface; they were IN
willing to continue draining the hill Of
water unless one or more OF the companies
that wsrs operating In Ruby Hill would
divide the burden Of expense with them.
II IL q settled fact that the machinery was
defective for the general requirements OF
the mine. but the volume Of water to be
contended with and all OF the material that
could have been broken In the mine could
have been raised to the surface with ma
chinery that should not have cost over
one-ifth OF the sums that were paid for
the cumbersome plant which now stands
idle at the LOGAN shaft. II lie probable
that
THE TRUE WATER v
OF the Ruby Hill lode. IL there is such .
thing, has not yet been enoount tered. This
is o moot question. The principal flow Of
water hat was encountered in the 1900.
foot c-osscut from the LOGAN shaft came
from the quartzite. which was nselessly
penetrated. but il proper measures were
taken. that flow could be easily stopped.
The balance OF the water came from the
shale in the main hanging wall Of the lode,
az well as from seepage from the surface,
but was immateriai. The limestone itself
Is comparatively dry. which fact has been
amply proved upon the lowest workings Of
the Richmond mine, which are deeper than
the bottom of the LOGAN shaft. Before
the qusrtzite was broken into in the LOGAN
crossout, when the water came
in in its greatest volume. fully seven feet
In width OF ledge material was encountered
between a wall Of in tercalated shsle and
quartzite, In direct connection with the