Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-11-20

berg mines, and through the Uncle Sam
and Hamburg mines further TO the south
ward. 1t faults all formations, but is IT.
self nowhere faulted or dislocsted go Tar ss
can be determined. II has been traced
upon the surface and is identified under
ground by it's Filings OF rbyolite. ore,
ledge material and composite OF rhyoliie
and clay, the latter having been produced
by sttrition where the walls are close to-
gether or nearly 30. II has 9 most import
ant bearing on the present structure OF
Ruby Hill and the country 10 the south
ward, as also on the relation OF the
ore bodies to each other. Throughout its
entire course i. lie found TO be the key 70
the structural problem OF the Ruby Hill
and Prospect Mountain minerslizsd zones.
The country southwest, on the footwall
eide OF the fault, has been raised several
hundred feet relatively 30 the hanging
wall. II is probable that there Was up
hesval and subsistence, bat that ihe latter
exceeded the former. Taken in connection
with all Of the mines 20 the southeast, IL is
found 70 be 3 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 Hill and Pros
pee, 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 "bsck" limestone. The
latter forms g wedge which, taken through
the Eureka Con. mine, extends from the
surface downward to near the 18Th level
end lies between the qusrtzite, the lace Oh
which has q mean dip OF about 40 degrees,
and the fault fssure, which dips ct 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 nsrrows 10 q thin edge al its lower
sxtremi:y. 1t is remarkable for its crushed
and broken condition. IL was IN this
wedge that sll OF the tremendous ore d
les which made Ruby Hill famous IN the
early days Of the district were mined.
The exploration OF the front limestone,
which o~yerlies the fault TO the southwest,
has not been sufficient 10 determine
whether either large deposits or any ore at
ali may be found in il. From the narrow
part of the upper wedge, downward, as
seen upon the 13th and 14th levels, a. well
az upon the i,200-foot crossut from the
LOGAN shaft, below the 14th level OF the
Eureka Con. mine, the face OF the quartz
he forms the footwall OF the fault, the lat
ter maintaining its dip at an angle OF ~
degrees, the same IS il does above. Below
the 18th level, with its thinest edge upper
most and its form inverted, as compared
with the upper wedge. but sisusted upon
the northeast or hanging wall side OF the
fault is q
LOWER WEDGE OF LIMESTONE
Identical 10 character with the upper
wedge. This Is crushed and shattered in
precisely the some manner and, subse.
auent to the upheavsl 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-
hsusted 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 is nc
question OF doubt among the experienced
miners Who rave worked on the deepest
levels OF Ruby Hill that there are bodies
Of ore to be found in the lower wedge oil
limestone as valuable as those which
were excavated In the big chambers of the
upper wedge. :.
The exploration OF the lower wedge would
require the expenditure of large sums Of
money. no doubs-perhaps hundreds Of
thousands, possibly millions OF dollars
bat when II IL bered that the Eu'
reka Con. and Richmond mines have alone
paid over ten million dollars In dividends
and made 0 number Of people wealthy,
and when IL is further borne in mind that
The ore is known 10 enter the lower wedge
Of limestone aud TO 60 down below any
depth We. attained In Ruby Hill, II 10 not
unreasonable TO believe that deeper ex'
ploration In the lower wedge would pay.
The only reason given 10 the public by
the Eureka Consolidated management fol-
not sinking the LOGAN shaft deeper and
prosecuting 10 the lode below the LOGAN
1900. foot level. was that the machinery
upon the LOGAN shaft was inadequate for
the dual requirements OF draining the mine
OF water and raising the material broken
underground 70 the surface; they were I'M
willing 10 continue draining the hill oi
water unless one or more OF the companies
that were 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 oil
the mine. but 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 to the surface with ma.
chinery that should not have cost over
one-ffth OF the sums that we're paid for
the cumbersome plant which now stands
idle At the LOGAN shaft. II 10 probable
that
THE TRUE wATER LEVEL
OF the Ruby Hill lode. II there Ia such
thing, has not yet been encountered. This
Is q moot question. The principal fow Of
water that was encountered in the 1900
foot crosscut from the LOGAN shaft came
from the qusrtzite. which Was uselessly
penetrated, but II 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,
as we'll as from seepsge from the surface,
but was immaterial. 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 quartzite was broken into in the LOGAN
1200-foot crosscut, when the water came
in In it's greatest volume. fully seven feet
In width OF ledge material was encountered
between q wall Of intercalated shale and