Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-10-09

ores, which we're more or less mixed with
limestone, that the lode had yielded above.
IL IL calculated that the subterrsnesn
disturbance which created the Ruby Hill
fault raised the footvall side Of the Pros
pect Mountain limestone, through the Eu-
reks Con. mine, about 400 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 1904 feet,
and the highest point On Ruby Hillreaches
an altitude Of only z 1921 feet above ses
level, II IL here seen that the difference
in the elevation Of the two points is ASS
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 900 feet below the top OF
the main ore chute and q little over 600 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 10 lie therefore fair
10 believe that the outcroppings Of the
Ruby Hill ore bodies were, at n 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 were forced up by inhltra-
ton and dynamic pressure from Bellows
correct. that relating to the difference in
size Of the o~utcroppiDgs Of Ruby Hill and
Prospect Mountain Is not without . reas-
onsble basis.
The question OF deeper exploration In
Ruby Hill and Prospects Mountain has re.
Gently been discussed here. and there has
been no reason sdduced 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. mines and
there il reasonable probability that ore
bodies may be found below the deepest
workings OF either OF the Ruby Hill mines
a. valuable as those which we're excavsted
above. II is manifest that the limestone
bodies OF Ruby Hill and Prospect Noun
tain. ct 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, add 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 uphesvsl and rels-
tive creation OF the Ruby Hill fault. There
can be bot little question as TO the import
ant bearing Of hefsult on the presentstruc.
,ure OF Ruby Hill and Prospect Mountain
and the relstiop OF the ore bodies to each
other. The former has been manifested
through diligent investigation i~nstigsted
under national authority. and IL is quite
probable that the ascending ore bearing
solutions passed mp through the great is
sure and. by means OF infltration and per-
collation. through the seams In the country
rock. we're conveyed to and deposited 10
the chambers and other cavities In the
limerick which we're created by the pre-.
viously occurring subterransous disturb
ances.
The elevation OF the main tunnel level
at the Diamond mine 10 1900 feet above
sea level, while that OF the highest point on
Ruby Hill IL only 1900 feet or thefesbout,
and the elevation Of the Ruby Hill crop
pings 10 hardly more than 100 feet above
that OF the deepest workings Of the Dis-
mond and Excelsior mines. In the latter
the ore produced 10 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 . better show.
ing than did the Richmond or Eureka
Con. o. the relative points Of elevation.
spd their present. condition 10 IN augury
that they will become ~ famous and equal
~ 10 productive and lucrative - we're the
Eureka Con. and Richmond mines 10 their
pslmisst days. but deep level mining 10
needed % muoh 10 the one - 10 the others.
&Tbe distinguishing names Of the iorma-
tious OF Eureka District are local and were
irst adopted BY Mr.. Arnold Hague. the
~eeologist In the Geld OF this division OF the
II q n Qurvav N tha Eoptiath parallal. |