Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-11-13

berg mines, and through the Uncle Sam
and Hamburg mines further 10 the south-
Ii faults ell formations, bat Is it,
self nowhere fsulted or dislocated so far as
can be determined. II has been traced
abe surface and Ia identified under
ground BY its filings Of rhyolise, ore,
ledge material and composite OF rhyohte
and clay, the latter having been produced
by attrition where the walls are close to-
gesher or nearly 80. IL has . most import
ant bearing on the present structure OF
Ruby Hill and the country TO she south
ward, as also on the relation OF the
ore bodies TO Zach other. Throughout lie
entire course il is found to be the key to
the structural problem Of the Ruby Hill
and Prospects Mountain m~inerslized zones.
The country southwest, on the fooswall
side oil The fault, has been raised several
hundred feet relatively TO the hanging
wall. Il is probable that there was up
heayal and subsistence. but that the latter
exceeded the former. Taken in connection
with all Of she mines to the southeast. IL lie
found 20 be q 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 s~sfront'' and 'bsck" limestone. The
latter forms a 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 9 mean dip Of about 40 degrees,
and the fault assure, which dips at an sD-
gle OF about 70 degrees. This, which we
shall call the upper wedge, lies on the
southwest or footwall side OF the fssure
and has been raised in this locality about
l,4OO feet relatively above the lower wedge
and nsrrows TO q thin edge at its lower
extremity. II lie remarkable for it's 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 o~verlies the fault to the southwest,
has not been sufficient to determine
whsthsr either large deposits or any ore Al
ali NAV be found in il. From the narrow
part OF the upper wedge. downward, o.
,eeu upon the 18th and 14th levels, rs well
az upon the 1,200-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 it's dip at an angle OF 70
degrees, the same "a ID does above. Below
the 18th level, with It's thinest edge upper
most and it's form inverted, 90 compared
with the upper wedge, but situated upon
the northeast or hanging wall side OF the
fault is a
LOWER d IF LIMESTONE
Identical in character with the upper
wedge. This is crushed and shattered II
precisely the some manner and. subse
cuent to the upheavAl and subsistence
along the fault line, was doubtless a N 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 and
prospects OF the district capable Of pro
ducing the precious metals that are seldom
or never talked about; but there lie nc
question Of doubt among the experienced
miners who have worked on the deepes,
levels Of Ruby Hill that there are bodies
OF ore to be found In the lower wedge OF
limestone a. valuable az those which
were sxesva,ed in the big chambers Of the
upper wedge.
The exploration OF the lower wedge would
require the expenditure Of large INNS OF
money, no doubt perhaps hundreds OF
thousands, possibly millions Of dollars;
but when IL is rememb ered that the Eu-
reka Con. and Richmond mines have alone
paid over ten million dollars in diyidends
snd made . number OF people wealthy,
aud when IL IL further borne in mind that
the ore IL known to enter the lower wedge
OF limestone and TO 10 down below any
depth yet attained in Ruby Hill. II 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 sinking the LOGAN shaft deeper and
crosscutting 10 the lode below the LOGAN
1900 foot level. was that the machinery
upon the LOGAN shaft was inadequate for
the dual requirements of draining tbe mine
OF water and raising the material broken
underground TO the surface; they were m
willing TO continue draining the hill Of
water unless one OF more OF the companies
that were operating In Ruby Hill would
divide the burden Of expense with them
II IL 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
have been raised to the surface with ma
chinery that should not have cost over
one-ffth OF the sums that we're paid for
the cumbersome plant which now stands
idle ct the LOGAN shaft. It is probable
that
TRUE wATER
OF the Ruby Hill lode. II there Is such .
thing, has not yet been encountered. This
is q moot question. The principal flow Of
water that was encountered In the 1900
foot crosscut from the LOGAN shaft came
from the ~quartzite. which was uselessly
penetrated, but II proper measures were
taken, that flow could be easily stopped.
The balance Of the water came from the
shale In the main hanging wall Of the lode,
as we'll as from seepsge from the surface,
but was immaterial. The limestone itself
is comparatively dry. which fact has been
proved upon the lowest workings OF
the Richmond mine, which are deeper than
the bottom Of the LOGAN shaft. Before
the quartzite was broken into ia the LOGAN
l200-foot crosscut, when the water came
In In its greatest volume, fully seven feet
In width OF ledge material was encountered
9 wall Of in tercalsted shale and
quartzite, In direct connection with the