Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-09-18

ores. which we're more or less mixed with
Limestone, that the lode had yielded above.
Ii is calculated that the subterrsnean
disturbance which created the Ruby Hill
fault raised the footwsll side OF the Pros
pect Mountain limestone. through the Eu.
reka Con. mine, about 400 feet.
PROSPECT
Rises to an elevation considerably higher
than that OF Ruby Hill, showing that the
erosion of the latter locality must have
greatly exceeded hat 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 sea
level. Ii ia here seen that the difference
in the elevation Of thetwo points is 2,313
feet.
The ~outcroppings Of the ore bodies Of
Ruby Hill we're larger than those OF Pros
poet 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 !, 600 feet below the top Of
the main ore chute aud a little over 500 feet
below the main tunnel level. The surface
of Ruby Hill is relatively fat when COM
pared with tina. 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 gresier than those of the Diamond and
Excelsior mines at the present; and il the
theory generally accepted here-thst 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 o~utcroppings of Ruby Hill and
Prospect Mountain is not without q ress.
enable basis.
/ 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. II has
been demonstrated that the ore bodies still
continue going down in the caves, below
| the deepest workings Of the Diamond and
/ Excelsior mines. 1t ia also shown that the
ore continues dipping below the deepest
| excavation in the Eureka Con. mine and
| there ia reasonable probability that ore
bodies may be found below the deepest
| workings OF either OF the Ruby Hill mines
as valuable as 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. 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 o~utcroppings 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 thefault on the presentstruo-
| sure Of Ruby Hill and Prospect Mountain
| and the relation Of the ore bodies to each
| other. The former has been manifested
| through diligent investigation instigated
/ under national authority, and il is quite
/ probable that the ascending ore bearing
| solutions passed up through the great ifs
sure and, 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 were created by the pre-
| giously occurring subterraneous disturb
ances.
The elevation OF the main tunnel level
at the Diamond mine is 1000 feet above
sea level. while that of the highest point on
1 Ruby HSl is only 1900 feet or theresbout.
and the elevation OF the Ruby Hill CROP
pings Ia hardly more than 100 feet above
l that OF the deepest workings Of the Dia-
mond and Excelsior mines. In the latter
the ore produced ia relatively improving
in quantity and quality with greater depth.
and the yield OF gold in proportion to the
| silver Is increasing. The Diamond and
Excelsior mines are making 3 better show.
ing than did the Richmond or Eureka
Con. At the relative points OF elevation.
and their present condition Ia an sngury
that they will become as famous and equal
ly as productive and lucrative A. we're the
Eureka Con. and Richmond mines 10 their
palmiest days, but deep level mining is
needed as much In the one as in the others.
*The distinguishing nsmesof the forma.
lions OF Eureka District are local and were
first adopted by Mr.. Arnold Hague. the
~geoIogiss In the field OF this division OF the
o., s. G. Survey Of the Fortieth Parallel.