Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-08-07

quivocally declared that the ore 's there
and more than that, they believe that !
goes down deeper and in paying guam
titles.
Mr.. Clarence King. the eminent geolo-
gist Of national fame, who formerly hat
charge Of the Richmond mine. and is quit
familiar with the physical condition o
Ruby Hill and the manner OF the deposi
tion OF the ore bodies, has expressed tn
opinion in the most indubitable manner
that exploration should be carried to fur
ther depth Of 1000 feet or tbereabout, ant
that there is no geological reason why or
should not be found in az valuable guam
titles as il was found above, IL the worl
were done. He thought that gold besrini
srsenical pyrites and silver bearing
gsleps would be found in more compsc
form. and hence richer than the oxidizet
ores, which were more or less mixed will
limestone, that the lode had yielded above
II is calculated that the subterranear
disturbance which created the Ruby Hill
fault raised the footwsll side OF the Pros
pect Mountain limestone, through the Eu
reks Con. mine, about 1400 feet.
PROSPECT MOUNTAIN
Rises to an elevation considerably higher
than taat OF Ruby Hill, showing that thu
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 1921 feet above ses
level. IL is here seen that the difference
in the elevation Of the two points is 2.31s
feet.
The outcroppings of the ore bodies oi
Ruby Hill we're larger than those OF Pros
pect Mountain, bnt the difference may bt
accounted for In the excessive erosion oi
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 800 feet below the top OF
the main ore chute and little over 500 feet
below the main tunnel level. The surface
of Ruby Hill 10 relatively fiat when COM
pared with that Of Prospect Mountain,
which Is doubtless due TO the greater ero-
sion OF the former, and il is therefore fair
TO 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; and II the
theory generally accepted here-that the
ore solutions were forced up by inAltrs.
tion and dynamic pressure from below-is
correct. that relating to the difference in
size OF the outcroppings Of Ruby Hill and
Prospect Mountain ia not without 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 TO show why the
work should not be remunerative. 1t has
been demonstrated ths. the ore bodies still
continue going down in the caves, below
the deepest workings Of the Diamond and
Excelsior mines. 1t is also shown thst the
ore continues dipping below the deepest
excavation in the Eureka Con. mine and
there 10 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 excavsted
above. IL Ia 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 and Prospect Mountain 10 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 bot little question as 10 the import
ant bearing OF the fault on the presentstru
ture OF Ruby Hill and Prospect Mountain
and the relation OF the ore bodies 10 each
other. The former has besn manifested
through diligent investigation instigAted
under national authority, and 1t is quite
probable that the ascending ore bearing
solutions passed up through the great rs
sure sud, by means OF infltration 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 subterrsneous disturb.
ances.
The elevation OF the main tunnel level
a. 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.
plnEe ~ uhIuil uOIe thdu AOV Aoct bpofe
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 Ia increasing. The Diamond and
Excelsior mines are making a 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
ly as productive and lucrative as we're the
Eureka Con. and Richmond mines In their
palmiest days. but deep level mining lie
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
eeologis. in the field OF this division OF the
U. s. @. Survey OF the Fortieth Parallel.
Two Armies-she Regular and Ir-
regular