Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-12-04

me hEmU a httun 9NA1
berg mines, and through the Uncle sam
and Hamburg mines further TO the south
ward, 1t faults all formations, but Is II
self nowhere fsulted or disiocated SO lar :,
can be determined. IL has been trsceo
upon the surface and IL identined UNDER
ground by lite filings OF rhyolite' ore
ledge material and composite oil rhyoii's
and clay. the latter having been produced
BY sttrition where the walls are close 70
gether or nearly so. Ii has 9 mostimport
ant bearing on the present structure o
Ruby Hill and the country 70 she south
ward, as also on the relation OF tn'
ore bodies TO each other. Throughout ~
entire course it is found to be the key e
the structural problem OF the huoy hi
and Prospect Mountain minerslized zones
The country southwest, on the iootwai
side OF .he fault, has been raised severa
hundred feet relatively TO the hanging
wall. L. il probable that there was up
heayal aud subsistence. but that the latte
exceeded the former. Taken in connection
with all OF the mines to the southeast, II II
found to be q fault plane along which TN
whole southwestern country has beer
raised from 500 10 1000 feet. There car
be no question that the key to the problem
of deep mining IN Ruby Hill and Pros
pect Mountain will eventually be found II
the Ruby Hill fault.
The limestone of Ruby Hill is divided
into two sections, which VI will designate
the front" and "back" limestone. The
latter forms q wedge which, taken through
the Eureka Con. mine, extends from To-
surface downward to near the 18th ieveI
eps lies between the qusrtzite, the face o
which has q mean dip Of about 40 degrees
and the fault fissure, which dips ct an an
gle of about 20 degrees. This. which w
shall call the upper wedge, lies on I'd
southwest or footwall side OF the fissur'
and has been raised in this locality sbou
I,4OO feet relatively above the lower wedg,
and nsrrows 10 q thin edge At lite lower
extremity. II il remarkable for its crushed
and broken condition. II was IN thu
wedge that sill OF the tremendous ore bod
les which made Ruby Hill famous in tn
early days OF the district were mined
The exploration OF the front limestone
which o~yerlies the fault 10 the southwest
has moi been sufficient TO determine
whether either large deposits or any ore q
ali NAV be found in 10. From the marrow
mart OF the uppe wedge, downward, o.
sesn mon the 18th and 14th levels. as vel
AZ upon the l,200.foot crossut from thu
LOGAN shaft, below the l4th level OF Tn
Eureka Con. mine, the face OF the quartz
lite forms the footwall OF the fault, the ist
ter maintaining its dip at an angle OF u
degrees, the same as il does aoove below
the 18th level, with its thinest edge upper
mos. and it's form inverted, as compared
with the upper wedge. bat situated upor
the northeast or hanging wall side OF sh'
fault 10 q
LOWER wEDGE oF LIMESTONE
Identical in character with the uppel
wedge. This is crushed and shattered IL
precisely the some manner. and. subse
duent to the upheaval and subsidenc'
along the fault line, was doubtless an un
divided part of the block OF limeston'
which forms the upper wedge.
The future OF Eureka District will de
pend largely on deep level mining; no
that the levels near the surface are ex
hausted Of ore, for on the contrary, Their
are hundreds of the smaller mines snt
prospects OF the district capable OF pro
ducing the precious metals that are seldom
or never talked about; but there 10 u,
question Of doubt among the experienced
miners who have worked On the deepes'
levels Of Ruby Hill that there are bodice
Of ore to be found In the lower wedge o
limestone as valuable as those which
were ~excAvsted in the big chambers OF tn
upper wedge.
The exploration Of the lower wedge would
require the expenditure Of large sums o
money. no doubs-perhaps hundreds o
thousands, possibly millions OF dollars
.-A~- .-a-ko~a that tha En-
reka Con. and Richmond mines have aloD'
paid over ten million dollars In dividendi
and made . number OF people wealthy
aud when 10 10 further borne In mind INA
the ore 10 known TO enter the lower wedg'
of limestone and to 60 down below apJ
depth yet attained In Ruby Hill. II 10 no
unreasonable TO believe shat deeper ex
ploration In the lower wedge would pay.
The only reason given to the public by
the Eureka Consolidated management fol
not sinking the LOGAN shaft deeper sne
crossoutting TO the lode below the LOGAN
l200.foot level. was that the machinery
upon the LOGAN shaft wal inadequate foI
the dual requirements OF draining the min'
OF water and raising the material broker
underground 10 the surface; they were un
willing TO continue draining the hill Of
water unless one or more OF the companies
that we're operating in Ruby Hill would
divide the burden OF expense with them
Il Ia a settled fact that the machinery WA
defective for the general requirements o.
the mine, but the volume Of water to bt
c~ontended with and all OF the material tina
could have been broken In the mine could
have been raised to the surface with ma
chinery that should not have cost ovei
one-ifth OF the sums shat were paid fol
the cumbersome plant which now stand
idle ct the LOGAN shaft. II 10 probable
that
Il TRUE WATER LEVEL
OF the Ruby Hill lode. IL there is suoh
thing, has not yet been encoun tered. Thii
Is o moot question. The principal flow o.
water that was encountered Ia the 1900
foot crosscut from the LOGAN shaft cam
from the quartzite, which was uselessly
penetrated, but II proper measures wer'
taken. that flow could be easily stopped
The balance OF the water came from ths
shale in the main hanging wall OF the lode
az we'll as from seepage from the surface
but was immaterial. The limestone itseli
ia comparatively dry, which fact has beer
amply proved upon the lowest workings oi
the Richmond mine, which are deeper than
the bottom OF the LOGAN shaft. Before
the quartzite was broken into in the LOGAN
crosscut. when the water came
10 in lite greatest volume, fully seven feet
In width OF ledge material was encountered
between q wall of intercslated shale and
quertzite, In direct connection with the