Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-10-16

and takes a southerly course through the
Hamburg belt Of limestone, westward OF
The Kemp a Keen, PATRON and Dunder-
bera mines. and through the Uncle Sam
and Hamburg mines further 10 the south
yard. II faults all formations, but lie IL
self nowhere fsulted or dislocsted SO far %
can be determined. II has been traced
mon the surface end is identified under
ground BY lis filings OF rhyolite, ore,
ledge material and composite Of rhyolise
and clay, the latter having been produced
nv attrition where the walls are close TO-
ee,ber or nearly 30. II has Q most import
ant bearing on the present structure Oh
Ruby Hill and the country 10 the south
ward, as also on the relation OF she
ore bodies 10 each other. Throughout its
entire course ID Ia found to be the key to
the structural problem OF the Ruby Hill
and Prospect Mountain mineralized zones.
The country southwest, on the footwsll
aide OF the fault, has been raised several
hundred feet relatively to the hanging
wall. II il probable that there was up
heaval and subsistence. but that the latter
exceeded the former. Taken in connection
with all Of the mines TO the southeast. IL 10
found to be o fault plane along which tae
WnOl6 sDutuWts 4 SOuhN JOS
raised from 500 to 1000 feet. There can
be no question that the key 10 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. The
latter forms q wedge which, taken through
- E--.L. T@- xnaua Axtanda fTnm tDA
surface downward to near the 18th level
end lies between the quartzite, the face Of
which has q mean dip OF about 40 degrees,
and the fault fissure, which dips at an an
gle OF about 10 degrees. This. which we
shall call the upper wedge, lies on the
southwest or footwall side OF the assure
and has been raised in this locality about
1,400 feet relatively above the owe wedge
aud nsrrows 10 a thin edge a. It's lower
extremity. II Is remarkable for its crushed
and broken condition. II was IN this
wedge that all OF the tremendous ore bod
les which made Ruby Hill famous In the
early days OF the district were mined.
The exploration of the front limestone,
which o~verlies the fault to the southwest,
has no been sufficient TO determine
whether either large deposits or any ore at
all may be found in il. From the narrow
part Of the upper wedge. downward, o.
seen upon the 18th and 14th levels. as well
az upon she 1.200-foot crossut from the
LOGAN shaft, below the 14th level OF the
Eureka Con. mine, the face OF the quartz
lite forms the footwsll Of the fault, the lat
ter maintaining its dip at an angle OF ~
degrees, the same as il does above. Below
the 18th level, With It's thinest edge upper
most and it's form inverted, ss compared
with the upper wedge. but situated upon
the northeast or hanging wall side OF the
fault il q
LOWER WEDGE OF LIMESTONE
Identical in character with the upper
wedge. This is crushed and shattered in
precisely the some manner, and. subse-
duent TO the upheaval and subsidence
along the fault line, was doubtless an I'M
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 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 az those which
were e~xcsvated 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-perhsps hundreds OF
thousands, possibly millions Of dollars;
bat when IL 10 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 u 10 further borne In mind that
the ore IL known to enter the lower wedge
Of limestone and TO go down below any
depth yet attained In Ruby Hill. II 10 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 10 the lode below the LOGAN
1900. foot level. was that h machinery
upon tho LOGAN shaft was inadequate for
the dual requirements OF draining ths mine
Of water and raising the material broken
underground TO the surface; they were IN.
WllliQR 10 cOutiDuo uEbiuluk tuo utti Vi
water unless one or more OF the companies
that we're operating in Ruby Hill would
divide the burden Of expense with them.
II 10 Q settled fact that the machinery was
defective for the general requirements OF
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-hfth OF the sums that we're paid for
the mbersome plant which now stands
idle Of the LOGAN shaft. II is probable
that
THE TRUE WATER EvR
OF the Ruby Hill lode, II there 10 such .
thing, has not yet been encount tered. This
10 . moot question. The principal flow OF
water that was encountered 10 the 1900.
crossout from the LOGAN shaft came
from the quartzite. 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 seepags from the surface,
but was ministerial. The limestone itself
is comparatively dry. which fact has been
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