Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-11-06

rnH hELuO a hEEuH AAAAA1 aa1
berg mines, and through the Uncle Sam
ana HAmburs mines further 10 the south
ward. II faults all formations, but is it,
self nowhere fAulted or dislocsted 80 far IS
can Re determined. 1t has been traced
upou the surface and is identified under
ground by it's Filings Of rhyoli;e, ore,
ledge material and composite OF rhyoliie
and clay, the latter having been produced
by attrition where the walls are close to-
getner or nearly 80. 1t has a most import
an. bearing on the present structure OF
Ruby Hill and the country 30 the south
ward, IS also on the relation OF the
ore bodies TO each other. Throughout It's
entire course il Ia found to be the key to
the structural problem Of the Ruby Hill
and Prospects Mountain minerslizsd zones.
The country southwest, on the footwsll
side Of the fault, hiss been raised several
hundred feet relatively TO the hanging
wall. IL lie probable that there was up
heaysl and subsistence, but that the latter
exceeded the former. Taken in connection
with all Of the mines TO the southeast, 1t 10
found to be q fault plane along which the
whole southwestern country has been
raised from 500 TO 2, 1000 feet. There can
be no question that the key TO the problem
of deep mining IN Ruby Hill and Pros
pect Mountain will eventually be found In
the Ruby Hill fault.
The limestone Of Ruby Hill is divided
into two sections, which we will designate
the ~"front'' and back" limestone. III
latter forms q wedge which, taken through
the Eureka Con. mine, extends from the
surface downward 10 near the 18th level
end lies between the quartzite, the face OF
which has Q mean dip of about 40 degrees,
and the fault fssure, which dips al an an
gle Of about 20 degrees. This, which We
shall call the upper wedge, lies on the
southwest or footwsll side OF the insure
and has been raised in this locality about
1,4O0 feet relatively above the lower Wedge
and narrows TO q thin edge at Its "
sxtremity. II 10 remarkable for its crushed
and broken condition. 10 was IN this
wedge that all of the tremendous ore bod
ies which made Ruby Hill famous in the
early DAYS OF the district were mined
The exploration OF the front limestone,
which o~yeriies the fault 10 the southwest,
has not been sufficient to determine
whether either large deposits or any ore at
all may be found in IL. From the narrow
par. OF the upper wedge. downward, as
seeu upon the 18th and 14th levels, ss well
az upon the 1,200-foot crossut from the
LOGAN shaft, below the l4th level OF the
Eureka Con. mine, the face OF the quartz
tie forms the footwall OF the fault, the lat
ter maintaining its dip at an angle of 70
degrees, the same as ID does above. Below
the 18th level, with its thinest edge upper
most and its form inverted, az compared
with the upper wedge. but situsted upon
the northeast or hanging wall side OF the
fault is a
LOWER WEDGE OF LIMESTONE
Identical in character with tho upper
wedge. This is crushed and shattered in
precisely the some manner, and. subse
ouent to the upheaval and subsistence
along the fault line, was doubtless an IN
divided part Of he block OF Limestone
which forms the upper wedge.
The future OF Eureka Districs 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-
duciDg the precious metals that are seldom
or never talked about; but there is 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 in the lower wedge of
limestone as valuable as those which
we're e~xosvated In the big chambers OF the
upper wedge. :,
The exploration ofthe lower wedge would
require the expenditure Of large sums OF
money. no d~oubt-perhaps hundreds OF
thousands, possibly millions OF dollars;
bot when IL ia rememb ered that the Eu-
reka Con. and Richmond mines have alone
paid over ten million dollars in dividends
and msde 9 number OF people wealthy,
aud when ID is further borne in mind that
the ore ia known to enter the lower wedge
Of limestone and to 60 down below any
depth yet attained in Ruby Hill. 1t Ia net
unreasonable to believe that deeper ex-
ploration in the lower wedge would pay.
The only reason given to 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 the LOGAN chat. was inadequate for
the dual requirements OF draining the mine
OF water and raising the material broken
underground to the surface; they were I'M
willing 10 continue draining the hill OF
water unless one or more OF the companies
that were operating In Ruby Hill would
divide the burden OF expense with them.
III 10 n settieU IhCt tuht tu6 uhculutEy was
defective for the general requirements OF
the mine, bnt the volume OF water to be
commended with and all OF the material that
could have been broken In the mine could
have been raised 10 the surface with ma
chinery that should not have cost over
one-ffth OF the sums that were paid for
the cumbersome plant which now stands
idle at the LOGAN shaft. 1t is probable
that
THE TRU WATER LEVEL
OF the Ruby Hill lode. II there Is such q
thing. has not yet been encountered. This
is 9 moot question. The principal flow OF
water that was encountered in the 1900.
foot crosscut from the LOGAN shaft came
from the qusrtzite, which was uselessly
penetrated, but il proper measures were
taken, that flow could be easily stopped.
The balance Of the water came from the
sha,e in the main hanging wall OF the lode,
as we'll as from seepage from the surface,
but was immatsrial. The limestone itself
IL 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 quartzite was broken into in the LOGAN
1200-foot crosscut, when the water came
10 in its greatest volume. fully seven feet
in width OF ledge material was encountered
between q wall OF intercalsted shale and
quartzite. In direct connection with the