Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-10-02

ores, which we're more or less mixed with
limestone, that the lode had yielded above.
II is calculated that the subterranesn
disturbance which created the Ruby Hill
fsult raised the footwsll side OF the Pros
pect Mountain limestone. through the Eu-
reks Con. mine, about 400 feet.
PROSPECT MOUNTAIN
Rises TO 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 reaches
an altitude Of only 1891 feet above sea
level, II is here seen that the difference
in the elevation Of the two points is 2,31s
feet.
The outcroppings Of the 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, 600 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 fat when com-
pared with that Of Prospect Mountain,
which ia doubtless due TO the greater ero-
sion OF the former, and il is therefore fair
to believe that the o~utcroppings 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-that the
ore solutions we're forced up by infltra-
ton and dynamic pressure from Bellows
| correct. that relating to the difference in
size Of the outcroppings Of Ruby Hill and
| Prospect Mountain is not without Q 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 remunerative. IL has
been demonstrated hat 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 ss those which were excsvsted
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, we're
originally one and the same that the die.
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 rela-
tive creation OF the Ruby Hill fault. There
can be bat little question as 10 the import
ant bearing OF the fault on the present struc-
ture OF Ruby Hill and Prospect Mountain
and the relation OF the ore bodies to each
other. The former has been 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 we're created by the pre-
viously occurring subterraneous disturb
ances.
The elevation OF the main tunnel level
ct the Diamond mine is 1900 feet above
sea level, while that OF the highest point on
Ruby Hill Ia only 1900 feet or thereabout.
and the elevation OF the Ruby Hill CROP
pings Is 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 10 increasing. The Diamond and
Excelsior mines are making Q better show.
ing than did the Richmond or Eureka
Con. at the relative points Of elevation,
aud their present condition 10 an augury
that they will become a. famous and equal
ly ~ productive and lucrative % we're the
Eureka Con. and Richmond mines In their
pslmiest days. but deep level mining IL
needed % much In the one 40 In the others.
[*The distinguishing names Of the forma-
tions OF Eureka District are local aud were
first adopted by Mr.. Arnold Hague. the
geologist in the field OF this division Of ths
U. 8. @. Survey OF the Fortieth Parallel.