Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-11-06

ores. which we're more or less mixed with
limestone, that the lode had yielded above.
1t 10 calculated that the subterranean
which created the Ruby Hill
fault raised the footwall side Of the Pros
pect Mountain limestone. through the Eu-
Con. mine, about 400 fees.
PROSPECT y
Rises TO 90 elevation considerably higher
than 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 reaches
an altitude Of only 1921 feet above ses
level. Il, is here seen that she difference
in the elevation Of the two points is ass
feet.
The outcroppings Of the ore bodies Of
Ruby Hill were 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 !, 900 feet below the top Of
the main ore chute and q 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-
sion Of the former, and il is therefore fair
to believe that the ou%tcroppings of the
Ruby Hill ore bodies were, at one time,
no greater han those OF the Diamond and
Excelsior mines at the present; and il the
theory generally accepted here-thst the
ore solutions were forced up BY iDfltra-
tion and dynamic pressure from Bellows
correct. that relating TO the difference in
size OF the o~utcroppings Of Ruby Hill and
Prospect Mountain is not without q reas.
enable basis.
Tho 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 remunerative. 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. Ii 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 as those which were excavated
above. II IL manifest that the limestone
bodies Of Ruby Hill and Prospect Noun
ssin, 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 outcroppings upon Ruby
Hill and Prospect Mountain is due to the
erosion. Undoubtedly the erosion occur-
red subsequent to the upheaval and rels-
rive creation OF the Ruby Hill fault. There
can be bat little question az to the import
ant bearing Of thefsult on the pr%esentstruc-
lure Of Ruby Hill aud Prospect Mountain
and the relation Of the ore bodies to each
other. The former has besn manifested
through diligent investigation instigated
under national authority, and il is quite
probable that the ascending ore bearing
solutions passed up through the great ifs
sure and, by means Of iniltration and per-
collation. through the seams In the country
rock. were conveyed to and deposited In
the chambers and other cavities in the
HU6IOck WHICH were CIthtcu ny tue pre-
viously occurring subterraneous disturb
ances.
The elevation OF the main tunnel level
at the Diamond mine IL 1000 feet above
sea level. while ths, OF the highest point on
Ruby Hill Ia only 1900 feet or theresbout,
and the elevation OF the Ruby Hill crop.
pings ia 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,
and the yield Of gold in proportion TO the
silver Ia increasing. The Diamond and
Excelsior mines are making 3 better show.
ing than did the Richmond or Eureka
Con. at the relative points OF elevation,
and their present condition Ia an sugury
that they will become az famous and equal
ly ss productive and lucrative as were she
Eureka Con. and Richmond mines 10 their
palmiess days. but deep level mining Is
needed az much In the one es In the others.
sTbe distinguishing names OF the fofma.
tons OF Eureka District are local and were
first adopted by Mr.. Arnold Hague. the
g~eOloaist in the field OF this division Of the
U, 8. q. Survey Of the Fortieth Parallel.