Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-06-19

the Richmond Office and is plsinly visible
near the mouth OF q tunnel that was for
merly run 10 connect with the Bell shaft;
thence northeast of the Eureka and
X X shafts TO point between the Phenix
and Jackson mines, where IL bends around
and takes southerly course through the
Hsmbu belt Of limestone, westward Of
the Kemp * Keen, Patroon and Dunder-
berg mines. and through the Uncle Sam
and Hamburg mines further 70 the south
ward. II faults all formations, but 10 it.
self nowhere faulted or dislocated SO far IS
can be determined. II has been traced
upon the surface and 10 identified under
ground by lis filings OF rbyolite. ore,
ledge material and composite OF rhyolite
and clay, the latter having been produced
by ettrition where the walls are close to-
gether or nearly 80. IL has most import
ant bearing on the present structure OF
Ruby Hill and the country to the south
ward. a. also on the relation Of the
ore bodies to each other. Throughout its
entire course IL is found TO be the key to
the structural problem Of the Ruby Hill
and Prospect Mountain mineralized zones.
The country southwest. on the footwall
side OF the fault, has been raised several
hundred feet relatively 10 the hanging
wall. IL is probable that there was up
heaval aud subeidence, but that the latter
exceeded the former. Taken in connection
with all OF the mines 10 the southeast, it 10
found 70 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 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 the fault hssure, which dips at an an-
gle OF about 10 degrees. This, which we
sbsll call the upper wedge, lies on the
southwest or footwAll side OF the fissure
and has been raised in this locality about
400 feet relatively above the lower wedge
and nsrrows 20 a thin edge 81 Its lower
sxtremity. Ii 10 remarkable for it's crushed
and broken condition. IL was 10 this
wedge that all OF the tremendous ore bod
les which made Kuby 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, as
seen upon the 18Th and ifth levels. as well
as upon the .200-foot crossut from the
LOGAN shaft, below the f4th level OF the
a. Il -
ite forms the footwall Of the fault. the lat
ter M maintaining its dip at an angle OF 10
degrees. the Same as IL does above. Below
the 18th level. with its thinest edge upper
most and its form inverted, As compared
the northeast or hanging wall eide OF the
fault is
LOWER WEDGE OF LIMESTONE
Iden ticsl in character with the upper
wedge. This il crushed and shattered in
precisely the some manner, and, subse.
ouent 10 the upheayal and subsidence
along 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 VI 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 as valuable as those which
were excavated in the big cham bers OF the
upper wedge. ..l
The explorstion OF the lower wedge would
require the expenditure Of large sums OF
money. no doubt-psrhsps hundreds OF
thousands, possibly millions Of dollars;
bu. when II 10 remem bered that the Eu
reka Con. aud Richmond mines have alone
paid over ten million dollars in dividends
and made q number OF people wealthy,
and when it 10 further borne in mind that
the ore il known 10 enter the lower wedge
OF limestone and to go down below any
depth vet attained In Ruby Hill. II is not
TO believe that deeper ex-
ploration in the lower wedge would pay.
The only reason given TO the public by
the Eureka Consolidated management for |
not striking the LOGAN shaft deeper and
10 the lode below the LOGAN |
400 fcot level. was that the machinery
upon the LOGAN shaft was inadequate for
the dual requirements OF draining the mine
OF water aud raising the materisl broken |
to the surface; they were un.
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.
II Is a settled fact that the machinery was
defective for the general requirements OF
the mine. but the volume OF water TO be
with and all Of the material that
could have been broken in the mine could
have been raised 10 the surface with ma
chinery that should not have cost over
one-fifth OF the sums that we're paid for
the cum bersome plant which now stands
idle at the LOGAN shaft. 1t is probable
that
THE TRUE WATER LEVEL
OF the Ruby Hill lode. IL there Ia such
thing, has not yet been encountered. This
IL q moot question. The principal flow OF
water that was encountered in the l2Co'
foot crosscut from the Locsn shaft came
from the quartzite, which wss uselessly
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
az well as from seepage from the surface.
but was mmaterisl. The limestone itself
Is comparatively dry. which fact has been
II. H. ~