Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-11-13

ores. which we're more or less mixed with
that the lode had yielded above.
IL is calculated that the sub;errsnesn
disturbance which created the Ruby Hill
fault raised the footvsll side Of the Pros
pect Mountain limestone, through the Eu-
reks Con. mine, about l400 feet.
PROSPECT MOUNTAIN
Rises to sn 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 1921 feet above ses
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 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
fsce, are found in the Diamond and Excel
sior mines, about 1 600 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 fiat when COM
pared with that Of Prospect Mountain,
which is doubtless due TO she greater ero-
sion OF the former, and ID is therefore fair
10 believe that the outcroppings OF the
Ruby Hill ore bodies were, ct time,
no greater than those OF the Diamond and
Excelsior mines 81 the present; and II the
theory generally accepted here-that the
ore solutions were forced up by infltrs-
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 8 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 sdduced to show why the
work should not be remunerative. II bias
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 Cor. mine and
there 10 reasonable probability that ore
bodies may be found below the deepest
workings Of either Of the Ruby Hill mines
AZ valuable as those which we're excavsted
above. 1t is 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
tie. and that the difference in the extent Of
the respective outcroppings upon Buby
Hill and Prospect Mountain lie due to the
erosion. Undoubtedly the erosion occur
red subsequent to the upheaval and rels-
tive creation of the Ruby Hill fault. There
ssn be bat little question as 70 the import
ant bearing Of thefsult on the presentstruc-
,ure OF Ruby Hill and Prospect Mountain
and the relation OF the ore bodies TO each
other. The former has been manifested
through diligent investigation instigs,ed
ander national authority, and il 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, we're conveyed to and deposited 10
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
IL the Diamond mine 10 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.
oings lie hardly more than 100 feet above
that Of the deepest workings Of the Dis-
nond and Excelsior mines. In the latter
.he 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 q better show.
ing than did the Richmond or Eureka
Con. ct the relative points OF elevation,
and their present condition IL an sugury
that they will become as famous and equal
ly 40 productive and lucrative - we're the
Eureka Con. and Richmond mines 10 their
pslmiest days. but deep level mining IL
needed 90 much 10 the one % In the others.
&The distinguishing anne OF the formA-
lions Of Eureka District are local and were
fret adopted By Mr.. Arnold Hague. the
zeologist In the field OF this division OF the
u. a. @. Suryev Of the Fortieth Parallel, |