Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-12-11

berg mines, and through The Uncle sam
and Hamburg mines further TO the south
ward, II faults all formations, but is II
self nowhere fsulted or dislocated SO far as
can be determined. 1t has been traced
upon the surface and is identified under
ground by its filings Of rhyolite, ore,
ledge material and composite OF rhyolte
and clay, the latter having been produced
BY attrition where the walls are close to-
gether or nearly 80. II has a 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 il is found to be the key 70
the structural problem OF the Ruby Hill
and Prospects Mountain minerslized zones.
The country southwest, on the footwall
side OF the fault, has been raised several
hundred feet relatively TO the hanging
wall. 1t is probable that there was up
heaval aud subsistence, but that the latter
exceeded the former. Taken in connection
with all Of the mines TO the southeast, ISIS
found TO be q fault plane along which the
whole southwestern country has been
raised from 500 to 1000 feet. There can
be no question ths: the key to the problem
of deep mining In Ruby Hill and Pros
pect Mountain will eventually be foundi IN
the Baby Hill fault.
This 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 qusrtzite, the face OF
which has 8 mean dip Of about 40 degrees,
and the fault fissure. which dips at an an
gle OF about 20 degrees. This, which we
shall call the upper wedge. lies On the
southeast or ~footwall side OF the assure
and has been raised in this locality about
I,400 feet relatively above the lower wedge
and nsrrows 10 a thin edge at its owe
sxtrenity. II Is remarkable for its crushed
and broken condition. IL 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 not been sufficient to determine
whether either large deposits or any ore at
all NAV be found in il. From the narrow
par. OF the upper wedge. downward, as
seen mon the 18th and 14th levels. as well
az upon the /, 200.toot crossut from the
LOGAN shaft, below the 18th level OF the
Eureka Con. mine, the face OF the quartz
i,e forms the footwsll OF the fault, the lat
ter maintaining lite dip at an angle OF ~
degrees, the same as II does above. Below
the 18th level, With its thinest edge upper.
most and it's form inverted. as compared
With tie upper wedge, bat situsted upon
the northeast or hanging wall eide OF the
fault is a
LOWER WEDGE OF LIMESTONE
Identical in character with the upper
wedge This is crushed and shattered IN
precisely the some q and. subse
ouent to the upheavsl and subsidence
along the fsult line, was doubtless an IN
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 u
prospects OF the district capable OF pro-
ducipg the precious metals that are seldom
or never talked about; but there is no
cuestion 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 a. those which
were szoavated in the big chambers Of the
upper wedge.
The celebration OF The lower wedgs would
require tho expenditure OF large Gums OF
money. no doubt perhaps hundreds OF
thousands, possibly millions of dollars;
bat when IL Ia remembered that the Eu-
reka Con. and Richmond mines have alone
paid over ten million dollars in dividends
and made = plumber OF people wealthy,
- wAoa "a 4. S.stAa- k1..a - rntnA shak
the ore Ia known to enter the lower wedge
81 limestone and TO GO down below any
depth yet attained In Ruby Hi. IL 10 not
unreasonable to believe that deeper ex-
ploration In the lower wedge would pay.
The only reason given 10 the public By
the Eureka Consolidated management for
not striking the LOGAN shaft desper and
eroascntting TO tho lode below the LOGAN
1900 foot level, was that the machinery
upon tho LOGAN shaft IVES inadequate for
the dual requirements OF draining abe mine
OF water and raising the material broken
underground 10 the surface; they we're un
willing 10 continue draining the hill OF
water unless one or more Of the companies
that were operating in Ruby Hill would
divide the burden o! expense with them.
II ia a settled fact that the machinery was
defective for the general requirements Of
the mlue, out the vOIum6 OF water 10 De
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
oue-ffth OF the gums that we're paid for
the cumbersome plant which now stands
idle at the LOGAN shaft. 1t ia probable
that
THE RUE WATER LEVEL
OF the Ruby Hill lode, il there Is such .
thing, has not yet been tered. This
is a moot question. The principal flow Of
water that was encountered in the 1900.
foot crosscnt from the LOGAN shaft came
from the qnartzite. which was rselessly
penetrated, but il proper measures were
taken. that flow oould be easily stopped.
Tbs balanea OF the water came from the
shs.e in the main hanging wall of the lode,
"a we'll as from seepage from the surface,
but was immaterial. The limestone itself
ia comparatively dry. which fact has been
amply proved upon the lowest workings OF
the Richmond mine. which are deeper than
the bottom Of tho LOGAN shaft. Before
the quartzi,e was broker into ia the LOGAN
1900 foot crossont, when the water came
ia in it's greatest volume, fully seven feet
In width of ledge material was encountered
between a wall Of intercslsted shale and
quartzite. in direct connection with the
fault, and about three feet OF that was