Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-12-11

ores. which we're more or less mixed with
limestone, that the lode had yielded above.
IL is calculated that the subterrsnesn
disturbance which created the Ruby Hill
fault raised the footwsll side OF the Pros
pect Mountain limestone. through the Eu-
reka Con. mine, about 1400 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 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 sea
level. II is here seen that the difference
in the elevation OF the two points Is 2,3l3
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, 600 feet below the top OF
tut uttA OA0 "a ~ v " AO1s
below the main tunnel level. The surface
| Of Ruby Hill is relatively fla, when COM
| pared with that OF Prospect Mountain,
which lie doubtless due 10 the greater ero.
sion Of the former, and il is therefore fair
10 believe that the o~uscroppings of the
Ruby Hill ore bodies were, at one time,
no greater than those of the Diamond and
Excelsior mines at the present; and il the
theory generally accepted ~bere-tha. the
ore solutions we're forced up by indltrs-
ton and dynamic pressure from bellows
correct, that relating TO the difference in
-ize OF the o~utcroppings OF Ruby Hill and
Prospect Mountain is not without 9 ress-
enable basis.
The question OF deeper exploration in
Ruby Hill and Prospect Mountain has re-
Gently been discussed here, aud 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 ia also shown that the
ore continues dipping below the deepest
excavation in the Eureka Con mine and
there il reasonable probability that ore
bodies may be found below the deepest
workings Of either Of the Ruby Hill mines
a. valuable a. those which we're excavated
| above. |, Is manifest that the limestone
bodies of Ruby Hill and Prospect Noun
tain. at present separated by the granite
and Prospect Mountain quartzite, we're
originally one and the same that the dis
connection occurred through excessive ero-
sion above the Prospect Mountain quartz
ite, and tina 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 20 the uphoaval and rela-
tive reation OF the Ruby Hill fault. There
| can be bat little question as 70 The import
ant bearing OF thefault on the preseDtstruc-
lure 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 it is quite
| probable that the ascending ore bearing
solutions passed up through the great hs-
sure and, by means Of infltrstion and per.
collation. through the seams In the country
rock. were conveyed TO and deposited In
the chamb ers and other cavities In the
limerick which we're created BY the pre-
viously occurring subterrsneous disturb
apces.
The elevation OF the main tunnel level
At the Diamond mine Is 1000 feet above
ses level. while that of the highest point on
Ruby Hill Ia only 1900 feet or thereSbout.
and the elevation Of the Ruby Hill crop.
piugs Ia hardly more than 100 feet above
,ha. Of the deepest workings Of the Dis-
mond and Excelsior mines. Ia the latter
the ore produced Is relatively improving
10 quantity and quality with greater depth,
and the yield o, 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. e, the relative points OF elevation.
and their present condition 10 an suRury
that they will become AZ fam BUS and equal
" ~ productive and lucrative a. we're the
Eureka Con. and Richmond mines Ia their
palmiest days, but deep level mining 10
needed as much In the one IS IN the others.
*Tbe distinguishing names OF the forms.
.ions OF Eureka District are local and wore
irst adopted by Mr.. Arnold Hague. the
esoloeis. In the field OF this division of The
U. 8. G Survey OF the Forsisth Parallel.