Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-09-11

berg mines, and through the Uncle sam
and Hamburg mines further 10 the south
ward. Il faults ell formations, but Is IT.
self nowhere fsulted or dislocsted so lar IS
can be determined. 1t has been traced
upon the surface and is identified under
ground by it's Filings Of Thyolite, 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 30. 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 Prospects 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
heaval and subsistence. but that the latter
exceeded the former. Taken in connection
with all OF the mines TO the southeast, it Is
found to be a 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
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 eback" limestone. The
latter forms a wedge which. taken through
the Eureka Com mine, extends from the
surface downward to nesr the 18th level
end lies between the quartzite, the face OF
which has a mean dip Of about 40 degrees,
and the fault assure, which dips at an an
gle OF about 20 degrees. This. which we
shall call the upper wedge, lies on the
southwest or footwsll side OF the fssure
and has been raised in this locality about
1,4O0 feet relatively above the lower wedge
and nerrows TO a thin edge at Its 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 overlies the fault to the southwest,
has not been sufficient to determine
whether either large deposits or any ore at
all NAV be found in il. From the narrow
part OF the upper wedge, downward, as
seen upon the 18th and 14th levels. as we'll
as upon she l,200-foot crossut from the
LOGAN shaft, below the 14th level OF the
Eureka Con. mine, the face Of the quartz
tie forms the footwsll Of the fault, the lat
ter maintaining Its dip at an angle OF 70
degrees. the same as ID does above. Below
the 18th level, with its thiDest edge upper.
most and it's form inverted, as compared
with the upper wedge, but situated upon
the northeast or hanging wall side Of the
fault ia q
LOWER D OF LIMESTONE
Identical in character with the upper
wedge. This is crushed and shattered in
preoisely the some manner, and, subse.
along the fault line. was doubtless an nm.
divided mart of the block OF limestone
which forms the MINER wedge.
The fntnre Of Eurek. District will de.
mend largely on deem level mining: moi
hansted of ore for on the contrary. there
ara hundreds of the smaller mines and
nrosnects of the district cspable of nro.
ducino he nrecions metals tbat are seldom
or never talked about: but there is mo
onestion Of donbt among the experienced
miners who have worked on the deenest
levels of Rubv Hill that there are bodies
NJ ore TO he fonnd in aha lower wedge Of
Limestone as vaInable as those which
were exosyated in tbe bio chambers Of The
nnner wedoe.
The exploration OF the lower wedge would
reouire the ~expenditure of large sums OF
money. no donbt-perhaps hundreds of
tbonssnds' nossiblv millions Of dollars:
hn. when IL IA amen bered that the En-.
reka Con. and Richmond mines have alone
maid over ten million dollars in dividends
ana made a nnmber NJ peonle wealthy.
ana wben II ia fnrther horne in mind that
the ore ia known to enter the lower wedge
OF limestone and to go down below any
depth vet attained in Ruby Hill, il Ia not
unreasonable to believe that deeper ex-
ploration in the lower wedge would pay.
The only reason given to the public by
the Eureka Consolidated management for
not sinking the LOGAN shaft deeper and
prosecuting 10 the lode below the LOGAN
120O.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 TO the surface; they were in
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 ia q 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