Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-12-18

pres. which we're more or less mixed with
that the lode had yielded above.
Is il calculated that she subterranesn
which created she Ruby Hill
fault raised the footwsll side OF the Pros
pee. Mountain limestone. through the Eu-
reka Con. mine, about l4O0 feel.
PROSPECT MOUNTAIN
Rises to an elevation considerably higher
than tha 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 9.6O4 feet
and the highest point on R1by Hillreaches
an altitude OF only 1921 feet above ses
level. Il Is here seen that the difference
in the elevation Of the two points Is 2,3l3
feet.
The o~utcroppings Of the ore bodies OF
Ruby Hill were larger than those oil Pros
poet Mountain, but the difference may be
accounted for in the excessive erosion Oh
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 !, 600 feet below the top Of
the main ore chute aud 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 is doubles, 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 thar those Of the Diamond and
Excelsior mines at the present; and II the
theory generally accepted here-thst the
ore solutions were forced up by inhltrs-
ton and dynamic pressure from below-is
correct, that relating to the difference in
lie 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 sdduced to show why the
work should not be remunerstive. 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. 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
az valuable as those which we're excsvated
above. 1t Is manifest that the limestone
bodies OF Ruby Hill and Prospect Noun
tain, at present separated by the granite
and Prospect Mountain quarizite. we're
originally one and the same that the dis
connection occurred through excessive ero-
sion above the Prospect Mountain quartz
lite, and thai the difference in the extent OF
the respective o~utcroppings upon Ruby
Hill and Prospect Mountain Ia due to the
erosion. Undoubtedly the erosion occur
red subsequent to the uphesval and rels-
tive creation OF the Ruby Hill fault. There
can be bat little question as 10 the import
ant bearing OF thefault on the p%resentstruc-
,ure Of Ruby Hill and 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 ii Ia quite
probable that the ascending ore bearing
solutions passed up through the great rs
sure and, by means OF infltrstion and per.
collation. through the seams in the country
rock, were conveyed to and deposited 10
the chambers and other cavities in the
limerick which we're created by the pre-.
viously occurring subterrsneous disturb.
ance5.
The elevation OF the main tunnel level
at the Diamond mine lie 1900 feet above
sea level, while that OF the highest point on
Ruby Hill lie only 1900 fee, or Whereabouts,
and the elevation Of the Ruby Hill crop.
pings Ia hardly more than 100 feet above
that Of the deepest workings Of the Dia-
mopd and Excelsior mines. To 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 9 better show
ing than did the Richmond or Eureka
Con. at the relative points OF elevation,
aud their present condition 10 40 augury
that they will become as famous and equal
ly ae productive and lucrative - were the
Eureka Con. and Richmond mines 10 their
pslmiest days. but deep level mining ID
needed as much 10 the one 40 In the others,
*The distinguishing names OF the forma'
tious OF Eureka District are local aud vert
8rst adopted by Mr.. Arnold Hague. tht
geoloRist In the field OF this division OF ths
U. 8. @. Survey OF the Fortieth Parallel.