Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-08-14

she Richmond Office and Is plainly visible
near the mouth Of q tunnel that was for
merry run TO connect with the Bell shaft;
thence northeast OF the Eureka aud
X X shafts TO point between the Phenix
and Jackson mines, where IL bends around
and takes q southerly course through the
Hamburg belt Of limestone, westward Of
she Kemp 4 Keen, Pstroon and Dunder-
berg mines, and through the Uncle Sam
and Hamburg mines further to the south.
ward. II faults all formations, but is it.
self nowhere fculted or dislocated so far Is
can be determined. Ii has been traced
upon the surface and is identified under
ground by its filings OF rbyolite. ore,
ledge material and composite OF rhyolite
and clay, the latter having been produced
by sttrition where the walls are close to-
gether or nearly go. Ii has most import
ant bearing on the present structure OF
Ruby Hill and the country 10 the south
ward. as also on the relation OF the
ore bodies 10 each other. Throughout its
entire course it 10 found to be the key to
the structural problem OF the Ruby Hill
and Prospect Mountain mineralized zones.
The country southwest, on she footwall
side OF the fault, has been raised several
hundred feet relatively TO the hanging
wall. II Is probable that there was up
hesysl and subsidence. but that the latter
exceeded the former. Taken in connection
with all OF the mines TO the southeast, it Is
found TO be 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 "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 q mean dip Of about 40 degrees,
and the fault fissure. which dips at an an
gle OF about 10 degrees. This, which we
shall call the upper wedge. lies on the
southwest or footwall side OF the hssure
and has been raised ia this locality about
/, 400 feet relatively above the lower wedge
and nsrrows to q thin edge 81 its lower
axtremity. IL is remarkable for its crushed
and broken condition. II was in this
wedge that all OF the tremendous ore bod
ies 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 10 determine
whether either large deposits or any ore at
all may be found In IL. From the narrow
part OF the upper wedge. downward, IS
seen upon the 18th and 14th levels. as we'll
as upon the l.200foot 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 10
degrees. the same Rs IL does above. Below
the lSth level. with its thinest edge upper
most and it's form inverted, ss compared
with the upper wedge. but situated upon
the northeast or hanging wall side OF the
fault 10 q
LOWER WEDGE OF LIMESTONE
Identical in character with the upper
wedge. This IL crushed and shattered in
precisely the some manner. and. subse-
auent 20 the upheaval and subsidence
slong the fault line, was doubtless an un-
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-
duciug the precious metals that are seldom
or mover 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 ss valuable as those which
we're excavatsd 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-perhaps hundreds OF
thousands, possibly millions OF dollars;
bat when il is rememb bered that the Eu-
reka Con. aud Richmond mines have alone
paid over ten million dollars In dividends
and made a number OF people wealthy,
and when ID il further borne in mind that
the ore il known TO enter the lower wedge
Of limestone aud TO go down below any
depth vet attained in Ruby Hill. II is 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 Tor
not Striking the LOGAN shaft deeper and
crosseutting 20 the lode below the LOGAN
1900 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 un.
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 a settled fact that the machinery was
defective for the general requirements OF
the mine. but tho volume OF water TO DC
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
ouo-iifth OF tho sums that we're paid Tor
the cumbersome plant which now stands
idle at the LOGAN shaft. II is probable
that
THE TRUE WATER LEVEL
OF the Ruby Hill lode. IL there IS suon
thing, has not yet been encountered. This
il moot question. The principal now OF
water that was encountered in the l2oo-
| foot crosscut from the LOGAN shsft came
from the quartzite. which Was useiessiy
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 seepage from the surface:
but was immaterial. The limestone itself
1 l.. .ah faok has haaQ