Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-07-24

quivocally declared that the ore is there,
and more than that, they believe that 4,
goes down deeper and in paying guam
titles.
Mr.. Clarence King, the eminent geolo-
gist Of national fame, who formerly had
charge Of the Richmond mine. and is quite
familiar with the physical condition OF
Ruby Hill and the manner Of the deposi-
ton OF the ore bodies, has expressed the
opinion in the most indubitable manner,
| that exploration should be carried to fur
ther depth Of / 900 feet or theresbout, and
that there Is no geological reason why ore
should not be found in 90 valuable juan
titles as il was found above, IL the work
| we're done. He thought that gold. bearing
| srsenical pyrites and silver-bearing
galena would be found in more compact
form. and hence risher than the oxidized
ores, which we're more or less mixed with
limestone, that the lode had yielded above.
II is calculated that the subterrsnean
distur bance which created the Ruby Hill
fault raised the footwall side Of the Pros.
pect Mountain limestone. through the Eu-
reka Con. mine, about 1400 feet.
PROSPECT MOUNTAIN
Rises to an 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 9,604 feet,
| and the highest point on Ruby Hill reaches
an altitude Of only 1921 feet above sea
| level. II is here seen that the difference
| in the elevation OF the two points is 2,313
/ 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 sugment
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 aud little over 500 feet
below the main tunnel level. The surface
Of Ruby Hill is relatively fat when COM
pared with that Of Prospect Mountain,
which lie doubtless due to the greater ero-
sion OF the former, and il Is therefore fair
20 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; aud il the
theory generally accepted here-thst the
ore solutions were forced up by infiltra-
tion 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 q 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 adduced 10 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 aud
Excelsior mines, IL 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 we're excavated |
above. II 10 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 |
ite, and that the difference in the extent OF |
the respective outcroppings upon Ruby |
Hill aud Prospect Mountain is due to the |
erosion. Undoubtedly the erosion occur |
red subsequent to the uphesval and rela- |
tive creation OF the Ruby Hill fault. There |
can be bat little question as to the import |
ant bearing OF thefsult on the presentstruc
ture OF Ruby Hill and Prospect Mountain |
and the relation OF the ore bodies 10 each |
other. The former has been manifested |
through diligent investigation instigatsd |
under national authority, and II is quite |
probable that the ascending ore bearing /
solutions passed up through the great fis-
sure aud, by means OF infltrstion and per-
collation. through the seams In the country |
rock. we're conveyed to and deposited in |
the chambers and other cavities In the |
limerick which we're created by the pre-. |
viously occurring subterraneous disturb. |
anoes.
The elevation OF the main tunnel level |
al the Diamond mine is 1900 feet above |
sea level. while that OF the highest point on |
Ruby Hill is only 1900 feet or thereabout, |
and the elevation OF the Ruby Hill crop |
pings Ia hardly more than 100 feet above |
that OF the deepest workings Of the Dis-
mond and Excelsior mines. In the latter |
the ore produced is relatively improving |
in qnsntity and quality with greater depth. |
and the yield Of gold in proportion to the
silver ia increasing. The Diamond and
Excelsior mines are making better show
ing than did the Richmond or Eureka
Con. at the relative points Of elevation,
and their present condition is an augury
that they will become as famous and equal
" as productive and lucrative as we're the
Eureka Con. and Richmond mines in their
palmiest days, but deep level mining is
needed as much In the one as In the others.
*The distinguishing names OF the forma-
,ions OF Eureka District are local and we're
fret adopted by Mr.. Arnold Hague. the
eeologist in the field OF this division OF the
U. s. G. Survey OF the Fortieth Parallel.
Two Armfes-the Regular and Ir.
regular