Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-08-07

most uniform southessterly course, with
an average dip, underground, OF about 10
degrees 70 the northeast. 1t passes near
the Richmond Office and is plsinly visible
near the mouth Of q tunnel that was for
merly run to connect with the Bell shaft;
thence northeast Of the Eureka and
X X shafts 70 point between the Phenix
and Jackson mines, where 10 bends around
and takes southerly course through the
Ham burg belt OF limestone, westward Of
the Kemp * Keen, Pssroon and Dunder-
berg mines, and through the Uncle Sam
and Hamburg mines further TO the south
ward. IL faults all formations, but is IT,
self nowhere faulted or dislocated SO far o.
can be determined. II has been traced
upon the surface and is identified under
ground by its Filings OF rhyolite, ore,
ledge material and composite OF rhy yolite
and clay, the latter having been produced
by attrition where the walls are close to-
gether or nearly so. II has 9 most import
ant bearing on the present structure OF
Ruby Hill and the country TO the south
ward, as also on the relation OF the
ore bodies to each other. Throughout its
entire course it is found TO be the key TO
the structural problem Of the Ruby Hill
and Prospect Mountain mineralized zones.
The country southwest, on the footwall
side OF the fault. has been raised several
hundred feet relatively to the hanging
wall. Ii is probable that there was up
heavsl and subsidence, 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
uI. 10 sheua kAR Nrwr haa
raised from 500 to 1900 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
in 10 two sections, which we will designate
the "fronr and "bsck" limestone. The
latter forms q 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 mean dip Of about 40 degrees,
and the fault fissure, which dips at an an.
gle OF about 70 degrees. This. which we
shall call the upper wedge, lies on the
southwest or footwall aide Of the fssure
aud has been raised in this locality about
l AGO feet relatively above the lower wedge
aud nsrrows to q thin edge at its lower
IL 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 overlies the fault TO the southwest,
has not been sufficient 10 determine
whether either large deposits or any ore at
all may be found in IL. From the narrow
part OF the upper wedge. downward. as
seen upon the 18th and 14th levels, ss well
az upon the ,200-foot crossut from the
LOGAN shaft, below the 14th level OF the
Con. mine. the face Of the quartz
tie forms the footwsll Of the fault, the lat
ter m maintaining its dip at an angle OF 10
degrees, the same a. ID does above. Below
the 18th level, with Its thinest edge upper
most aud lite form inverted. ss compared
with the upper wedge. but situated upon
the northeast OF hanging wall aide OF the
fault is q
LOWER WEDGE OF LIMESTONE
Identical In character with the upper
wedge. This 10 crushed and shattered in
precisely the some manner, and. subse-
quent to the upheaval and subsidepce
slong 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-
duoing 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 arc bodies
OF ore 20 be found 10 the lower wedge OF
limestone as valuable a. those which
we're exoavstsd 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;
but when IL 10 remember that the Eu.
reka Con. and Richmond mines have alone
paid over ten million dollars in dividends
and made Q number OF people wealthy.
and when 10 10 further borne in mind that
the ore is known TO enter the lower wedge
OF limestone and 10 go down below any
depth yet attained In Ruby Hill. II Is not
unreasons able to believe that deeper ex'
ploration In the lower wedge would pay.
The only reason given 70 the public BY
the E Eureka Consolidated management for
not sinking the LOGAN shAt deeper and
cross1utting 10 the lode below the LOGAN
1900 foot level, was that the machinery
upon tho Locan shaft was inadequate for
the dual requirements OF draining the mine
OF water and raising the material broken
underground to the surface; they were un
willing to 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.
II IL a 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-fitth OF the sums that were paid Tor
the cum bersome plant which now stands
idle at the LOGAN shaft. 1t is probable
that
THE TRUE WATER LEVEL
OF the Ruby Hill lode. II there is suoh .
thing, has not yet been encountered. This
IL a moot question. The principal now OF
water that was encountered In the l2uo-
foot crosscut from the LOGAN shaft came
from the quartzits. which was uselessiy
penetrated, but II proper measures were
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