Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-10-23

ores. which were more or less mixed with
limestone, that the lode had yielded above.
Ii is calculated that the subterranean
disturbance which created the Ruby Hill
fault raised the footwsll side of the Pros
pect Mountain limestone, through the Eu-
reks Con. mine, about 1400 feet. .
PROSPECT
Rises to an elevation considerably higher
than that OF Ruby Hill, showing thai the
erosion OF the latter locality must have
greatly exceeded that of the former. Pros
rect Peak, the highest point on Prospect
Mountain, has an elevation Of 1904 feet,
and the highest point on Ruby Hillreaches
an altitude Of only 1921 feet above sea
level. 1t is here seen that the difference
in the elevation Of the two points is 2,313
feet.
The ~outcroppings Of tho ore bodies of
Ruby Hill we're larger than those of Pros
pect Mountain, but the difference may be
accounted for in the excessive erosion OF
Ruby Hill. In the main body of Prospect
Mountain the ore bodies generally augment
in size with the increase Of depth. The
deepest workings in Prospect Mountain,
following the ore downward from the sur
face, are found in the Diamond and Excel
sior mines, about l, 900 feet below the top o!
the main ore chute aud a little over 500 feet
below the main tunnel level. The surface
of Ruby Hill is relatively fiat when com
pared with that of Prospect Mountain,
which IL doubtless due to the greater ero-
sion Of the former, and il lie therefore fair
TO believe that the outcroppings OF the
Ruby Hill ore bodies were, at one time,
no greater than those Of the Diamond and
Excelsior mines ct the present; and IL the
theory generally accepted here-thst the
ore solutions were forced up by indltra-
ton and dynamic pressure from below-is
correct. that relating to the difference in
size OF the ou~tcroppings OF Ruby Hill and
Prospect Mountain is not without g reas-
enable basis.
The question OF deeper exploration in
Ruby Hill and Prospect Mountain has re-
Gently been discussed here, and there has
been no reason sdduced TO show why the
work should not be remunerative. Ii has
been demonstrated that the ore bodies still
continue going down in the caves, below
the deepest workings of the Diamond and
Excelsior mines. Ii ia also shown that the
ore continues dipping below the deepest
excavation in the Eureka Con. mine and
there is reasonable probability that ore
bodies may be found below the deepest
workings Of either Of the Ruby Hill mines
as valuable as those which were exeava,ed
above. 1t Is manifest that the limestone
bodies OF Ruby Hill and Prospect Noun
tain. at present separated by the granite
and Prospect Mountain quarizite. were
originally one and the same that the dis.
connection occurred through excessive ero-
sion above the Prospect Mountain quartz
lite, and hat the difference in the extent OF
the respective outcroppings upon Ruby
Hill and Prospect Mountain lie due to the
erosion. Undoubtedly the erosion occur
red subsequent to the upheaval and rels-
tive creation Of the Ruby Hill fault. There
can be but little question as 10 the import
ant bearing OF b efsult on the pressntstruc-
ture of Ruby Hill aud Prospect Mountain
and the relation of the ore bodies to each
other. The former has been manifested
through diligent investigation instiga.ed
under national authority, and il is quite
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