Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-06-26


degrees TO the northeast. 1t passes near
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
X X shafts TO 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 4 Keen, Patroon and Dunder-
berg mines. and through the Unole Sam
and Hamburg mines further 70 the south
ward. II faults all formstions, but Ia IT,
self nowhere fsulted or dislocated SO far %
can be determined. Ii has been traced
upon the surface and Is identified under
ground by Its Filings Of rhyolite, ore,
ledge material and composite OF rhyolite
and clay, the latter having been produced
by attrition where the walls are close TO-
gether or nearly so. Ii has most import
ant bearing on the present structure OF
Ruby Hill and the country to the south
ward, as also on the relation Of the
ore bodies TO each other. Throughout its
entire course it 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 to the hanging
wall. II Is probable that there was up
heavsl and subsidence. but that the latter
exceeded the former. Taken in connection
with all OF the mines TO the southeast, Ii is
found 20 be fault plane along which the
whole southwestern country has been
raised from 500 10 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 "back" 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 o 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 footwsll eide OF the fissure
and has been raised in this locality about
400 feet relatively above the lower wedge
aud nsrrows 10 a thin edge al Its lower
axtremity. IL 10 remarkable for its crushed
and broken condition. II was 10 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 oyerlies the fault TO the southwest,
has not been sufficient 10 determine
whether either large deposits or any ore at
all may be found in it. From the narrow
part OF the upper wedge, downward. as
seen upon the 18th and 14th levels. as well
az upon she / l,200-ioot 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 its dip at an angle OF 10
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 10 q
LOWER WEDGE OF LIMESTONE
Identical In character with the upper
wedge. This Is crushed and shattered In
precisely she some manner, and, subse-
auent 10 the upheaval 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
ths. 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 is no
question OF doubt among the experienced
mipers 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 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 remsm mbered 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 ID 10 further borne in mind that
the ore is known 10 enter the lower wedge
OF limestone and to 60 down below any
depth yet attained In Ruby Hill, Ii is not
unreasonable 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
crofsoutting to the lode below the LOGAN
1900 foot level. was that the machinery
upon the Locan shaft was inadequate Tor
the dual requirements Of draining the mine
OF water and raising the material broken
underground to the surface; they we're un.
willing 10 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 10 a settled fact that the machinery Was
defective for the general requirements OF
the mine, but the volume OF water TO DC
contended with and all OF the material that
could have been broken 10 the mine could
have been raised 10 the surface with ma
ohinery that should not have cost over
ons-fifth OF the sums that we're paid Tor
the cum bersome plant which now STANDS
| idle ct the LOGAN shaft. II is probable
| that
THE TRUE WATER LEVEL
| OF the Ruby Hill lode. II there Is sucn
thing, has not yet been encountered This
| is q moot question. The principal nov o.
water that was encountered in the izuo'
| foot crossout from the LOGAN shaft came
from the qusrtzite. which was uselessiy
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
az we'll as from seepage from the surface
al