Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-10-09

D+LA Aul1CCn naa
and Hamburg mines further 20 the south
ward. Ii faults all formations, but is IT.
self nowhere fsulted.or dislocated SO lar As
can. be determined. 1t has been traced
upon the surface snd.is identified under
ground by its filings Of rhyolite, ore,
ledge material and, composite OF rnyoise
apd,clsy, the latter having been produced
bv sttrition where the walls are close TO-
ge.her or nearly so. II has . mostimport.
bearing on the present structure Oh
Ruby Hill and the country 10 the south
ward, as also on the relation OF the
ore bodies toseach other. Throughout It's
entire course ID is found to be the key 70
the structural problem OF the Ruby Hill
and ProspectsM0untain minerslized zones.
The country. southwest, on the footwali
side Of 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 thesformer. Taken in connection
with all Of thesmines 10 the southeast, It's
found TO be,s fault plane along which tne
whole. southwestern country has been
r.isedfrom 500 to 1000 feet. There can
be no question that the key to the problem
OF deep mining IN Ruby Hill and Pros
pec, 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 ~.tfront" and "back" limestone. Inc
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 quartzite, the face OF
which has q mean dip Of about 40 degrees
and tbe:fault fissure, which dips at an an
gle OF shout 20 degrees. This, which we
shall call the upper wedge, lies on the
southwest or footwall side OF the assure
and has-been raised in this locality about
1,4OO feet relatively above the " Wedge
and narrows 10 q thin edge at Its "
sxtremity. II il remarkable for its crushed
ard broken condition. II was 10 this
wedge that all OF the tremendous ore bod
ies which made Ruby Hill famous In the
early days OF the district we're mined.
The expiorstion Of the front limestone,
which ~oyerliss the fault 10 the southwest,
has not been sufficient 10 determine
whether. either large deposits or any ore st
all may. be found 10 II. From the narrow
part Of the upper wedge. downward, Is
seen upon the 18th and 14th levels, % 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 its dip at an angle OF W
degrees, the same ss ID does above. Below
the 18th level, with its thinest edge upper
most and its form inverted, % compared
with the upper wedge. but situated upon
the northeast. or hanging wall side OF the
fault lisa
LOWER WEDGE OF LIMESTONE
Identicsl 10. character with the upper
wedge. This IL crushed and shattered IN
precisely the some manner, and. subse'
quent to the upheaval and subsistence
along the. fault line. was doubtless an IN
divided part OF the block OF limestone
which forms theupper 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 10 no
question 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 a. valuable as those which
were excavated In the big chambers OF the
upper wedge. :.
The exploration OF the lower wedge would
require the expenditure Of large sums OF
money. no doubt-perhsps hundreds OF
thousands, possibly millions Of dollars;
bat when IL is remembered that the Eu-
reka Con. and Richmond mines have alone
paid over ten million dollsrs In dividends
and made . number OF people wealthy,
and when ID 10 further borne In mind that
the ore Ia known to enter the lower wedge
Of limestone and 10 70 down below any
depth yet attained In Ruby Hill. II 10 not
unreasonable to believe that deeper OF.
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
1900. foot level. wss 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 surfaced they were m.
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 Of expense with them.
It 10 q settled fact that the machinery was
defective for the general requirements OF
the mine. but the volume OF water to be
contsnded with and ell Of the material that
could have been broken In the mine could
have been raised to the surface with ms
chinery that should. not have cost over
oue-ffth o. the sums that we're paid for
the cumbersome plant which now stands
idle ct the. LOGAN. shaft. II 10 probable
that.
THE rRUE WATER LEVEL
of;the Ruby Hill lode. II there 10 suoh .
thing, has mot yet been encountered. This
lisa mootqusstion. The principal dow Of
water thatswas. encountered 10 the 1900.
foot. crosscut.from the LOGAN shaft came
from the qusrtzite. which WAS uselsssIy
penetrated, but II proper measures were
taken, that flow could be easily stopped.
The balance Of. the water came from the
shale in thesmain hanging wall Of the lode,
as we'll as from seepage from the surface.
but was immateriak. The limestone itself
is comparatively, dry, which fact has been
amply proved upon the lowest workings Of
the Richmond mine, whichasre deeper than
the. bottom OF the LOGAN. shaft. Before
the quartzite was broken into 10 the LOGAN
crosscut. when the water came
In in its greatest volume, fully seven feet
In width Of ledge material was encountered
between Q wall Of intercGlsted shsle and
quartzite, In direct connection with the
and ahont three feat NJ thai vaa