Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-07-17

the Richmond Office and is plainly visible
near the mouth Of q tunnel that was for
merly run TO connect with the Bell shaft;
thence northeast OF the Eureka and
K X shafts 10 point between the Phenix
and Jackson mines, where 10 bends around
and takes q southerly course through the
Hamburg belt OF limestone, westward OF
the Kemp Keen, PATRON and Dunder-
berg mines, and through the Uncle Sam
and Hamburg mines further 70 the south.
ward. IL faults all formations, but is it,
self nowhere faulted or dislocated SO far as
can be determined. IL has been traced
upon the surface and is ident tilted under
ground by It's filings OF rhyolite, ore,
ledge material aud composite OF hyolite
and clay, the latter having been produced
by attrition where the walls are close to-
gether or nearly so. IL has most import
ant bearing on the present structure Of
Ruby Hill and the country to the south
ward. As also on tho relation OF the
ore bodies 10 each other. Throughout its
entire course IL is found to be the key to
the structural problem OF the Ruby Hill
and Prospect Mountain minerslized 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 shs mines TO the southeast, IL is
found TO be fault plane along which the
whole southwestern country has been
raised from 500 70 1000 feet. There can
be no question that the key 10 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 10 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 tbe qusrtzite, the face OF
which has 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
southwest or footwall side OF the fssure
and has been raised in this locality about
/, 400 feet relatively above the lower wedge
and nsrrows 10 a thin edge at its lower
axtremity. II 10 remarkable for it's crushed
and broken condition. IL vas in this
wedge that all OF the tremendous ore bod
les which made Ruby Hill famous in the
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
ell may be found in IT, From the narrow
part OF the upper wedge. downward, as
seen upon the 18th and 14th levels. IS we'll
az upon the ,200-foot crossut from the
LOGAN shaft, below the l4th level OF the
Eureka Con. mine. the face OF the quartz
ite forms the footwall OF the fault, the lat
ter maintaining it's dip at an angle OF 10
degrees, the same as ID does above. Below
the 18th level, with its thinest edge upper
most and its form inverted. as compared
with the upper wedge. but situated upon
the northeast or hanging wall side OF the
fault is O
LOWER WEDGE OF LIMESTONE
Identical in character with the upper
wedge. This is crushed and shattered in
precisely the some manner. and, subse-
quent to the upheaval and subsidence
along the fault 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 tho 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
lines tone as valuable 40 those which
were sxoavated 10 the big chambers OF the
upper wedge.
The exploration OF the lower wedge would
require the expenditure Of large sums OF
money. no doubt-psrhaps hundreds OF
thousands, possibly millions Of dollars;
but when Ii Ia remem bered that the Eu-
reka Con. and Richmond mines have alone
paid over ten million dollars in dividends
and made Q number OF people wealthy,
and when IL is further borne in mind that
the ore is known 10 enter the lower wedge
OF limestone and to go down below any
depth yet attained In Ruby Hill. II 10 not
unreasona able 10 believe that deeper ex-
plorstion 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
crossgutting TO the lode below the LOGAN
1900 foot level. was that the machinery
upon tho 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 we're operating In Ruby Hill would
divide the burden OF expense with them.
1, is a settled fact that the machinery was
detective for the general requirements OF
the mine. but the volume OF water to be
contended with and sll 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-fifth OF the sums that were paid for
the cum mbersome plant which now stands
idle at the LOGAN shaft. II is probable
that
THE TRUE WATER LEVEL
OF the Ruby Hill lode. II there is such
thing, has not yet been encountered. This
ia moot question. The principal fow OF
water that was encountered in the 100
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 seepage from the surface.
but was immateriai. The limestone itself