Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-09-04

ores. which we're more or less mixed with
limestone, that the lode had yielded above.
Ii is calculated tina, the subterrsnesn
disturbance which created the Ruby Hill
fault raised the footwall side Of the Pros
pect Mountain limestone, through the Eu-
rekA Con. mine, about 400 feet.
PROSPECT
Rises 20 an elevation considerably higher
thar that Of Ruby Hill. showing that the
erosion Of the latter locality must have
greatly exceeded that OF the former. Pros
pect Peak, the highest point on Prospect
Mountain, has an elevation Of 1904 feet,
and the highest point on Ruby Hill breaches
an altitude OF only 1921 feet above ses
level. IL is here seen that she difference
in the elevation Of the two points is 2,319
feet.
The ~outcroppings Of the ore bodies Of
Ruby Hill were larger than those OF Pros
poet 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 / 500 feet below the top Of
the main ore chute and 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 is doubtless due to The greater ero-
zion OF the former, and it is 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 at the present; and II the
theory generally accepted here-thst the
ore solutions were forced up by infltra-
ton and dynamic pressure from below-is
correct. that relating to the difference in
size of the outcroppings Of Ruby Hill and
Prospect Mountain is not without . ress.
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 adduced to show why the
work should not be remunerstive. IL has
been demonstrated that the ore bodies still
| continue going down in the caves, below
the deepest workings Of the Diamond and
Excelsior mines. 1t is 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 a. those which we're exeavated
above. 1t Is manifest that the limestone
| bodies Of Ruby Hill and Prospect Noun.
tain, at present separated by the granite
and Prospect Mountain quartzite, were
| originally one and the same that the dis.
connection occurred through excessive ero-
/ sion above the Prospect Mountain quartz.
lite, and that the difference in the extent OF
the respective outoroppings upon Ruby
Hill and Prospect Mountain is due to the
/ erosion. Undoubtedly the erosion occur.
red subsequent to the upheaval and rela-
tive creation of the Ruby Hill fault. There
can be but little question as TO the import
ant bearing OF thefsult on the presentstruc-
sure of Ruby Hill and Prospect Mountain
and the relation OF the ore bodies to each
/ other. The former has besn manifested
through diligent Investigation instigsted
under national authority, and ii Is quite
| probable that the ascending ore bearing
solutions passed up through the great ifs
sure and, by means Of infltrstion and per-
collation. through the seams in the country
rock, were conveyed to and deposited in
the chambers and other cavities In the
limerick which were created by the pre-
viously occurring subterrAneous disturb
ances.
The elevation OF the main tunnel level
at the Diamond mine lie 1900 feet above
sea level, while that OF the highest point on
Ruby Hill ia only 1900 feet or t~hereabout,
and the elevation Of the Ruby Hill CROP
pings lie hardly more than 100 feet above
that Of the deepest workings Of the Dia-
mond and Excelsior mines. In the latter
the ore produced is relatively improving
in quantity and quality with greater depth.