Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-06-12

from the froepeot hOuntaAn hM~es
throughout the southern section OF the
district. The Prospeo, Mountain and
| Hamburg limessones are identical in char
sc.er in all but that the latter 10 more
s~ilicious than the former. aud 10 vesihers
roushsr and breaks with . sharper frsc-
sure. Returning TO the
RUBY HILL FAULT.
II is frst observed northwsrd, 81 the sur
face near the Albion mine, taking an al
mos, uniform southessterly eourse. with
an average dip. underground, Of about 70
degrees 10 the northeast. II passes near
the Richmond Office and is plainly visible
near the mouth OF 9 tunnel that was for.
merly run to connect with the Bell shaft;
thence northeast Of the Eureka and
K K shafts 70 9 point between the Phenix
and Jackson mines, where 10 bends around
and takes . southerly course through the
Hamburg belt Of limestone, westward Of
the Kemp & Keen, PATRON and Dunder-
berg mines, and through the Uncle Sam
and Hamburg mines further 10 the south
ward. II faults all formations, Sut IL IL
self nowhere faulted or dislocAted so far as
can be determined. II has been traced
upon the surface and is identified under
ground BY it's filings Of rhyolite, ore,
ledge material and composite Of rhyolite
and clay. the latter having been produced
By attrition where the walls are close to-
gether or nearly SO. II has Q most import
ant bearing ON the present structure oil
Ruby Hill and the country 70 the south
ward, a. also on the relation Of the
ore bodies 10 each other. Throughout its
entire course il is found TO be the key TO
the structural problem Of the Ruby Hill
and Prospec, Mountain mineralized zones.
The country southwest, on the fooswAi
aide OF the fault. has been raised several
hundred feet relatively TO the hanging.
wall. II is probable that there wn up
heaval and subsidence. but that the latter
exceeded the former. Taken in connection
with all Of the mines to the southeast, iti
found TO be q fault plane along which the
whole southwestern country has been
raised from 500 70 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 "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 qusrtziie, the face OF
which has a mean dip Of about 40 degrees,
and the fault assure. which dips 81 an an
gle OF about 70 degrees. This. which we
shall call the upper wedge, hes on the
southwest or footwall side Of the assure
, and has been raised In this locality about
1.400 feet relatively above the lower wedge
! and narrows 70 q thin edge 81 Its lower
axtremity. II 10 remarkable for its crushed
and broken condition. II was in thii
WuOke tuht IA VI tuo tIcmO64S6s SSA
: les which made Ruby Hill famous in th'
early days OF the district we're mined
The exploration Of the front Limestone
which o~verlies the fault to the southwest
) has not been sufficient 70 determine
whether either large deposits or any ore .
ell may be found in 10. From the marrow
part Of the upper wedge. downward, q
seen upon the 18Th and 14th levels. - vel
Q 40 upon the l,200-foot orossut from tn
: LOGAN shaft, below the I4th level Of th'
: Eureka Con. mine. the face Of the quarts
I've forms the iootwall Of the fault, the lat
ter maintaining its dip At an angle Of u
. degrees, the same % u does above. Below
the 18th level, with lie thiness edge upper
. most and I've form inverted, % eompaxst
: with the upper wedge. but situated upoi
the northeast or hanging wall side Of III
fault hA
Lower WEDGE or LIMESTONE
Identical In character with the uppeI
. wedge. This Is crushed snd shattered II
ptcclfeiy tuo bOmo henoekg sAes seSso
quent to the upheavAl and subsidsnc'
. along the fault line, WAS doubtless an IN
divided part Of the block Of limsston'
, which forms the upper wedge.
The future Of Eureka District viii do
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 ans
Q prospects Of the district capable Of pro
: ducing the precious metals that are seldom
b or never talked about; but there 10 n
question Of doubt among the experienced
: miners who have worked on the deepss
? levels Of Ruby Hill that there are bodis'
Of ore to be found In the lower wedge o
limestone % valuable - those whicl
were exoavated In the big chambers Of th
upper wedge.
Q The exploration o the lower wedge woul'
Q require the expenditure Of large sums o
Q money. no doubt-perhaps hundreds o
Q thousands, possibly millions Of dollars
bat when IL 10 remembered that the Eu
II o. - Ds-k-1ol rc{caa hava alnp