Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-10-30

ores. which we're moro OF less mixed with
limestone, that the lode bad yielded above.
1t 10 calculated that the subterrsnean
disturbance which created the Ruby Hill
fsul. raised the footvsll side Of the Pros
pect Mountain Limestone. through the Eu-
reka Con. mine, about l400 feet.
PROSPECT n
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. IL 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
poet Mountain, but the difference may be
accoupted 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
BIOE luihCcs hDOut YOoO icCt UCAOW u tOR VI
the main ore chute aud a 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 the greater ero-
sion Of the former, and il is therefore fair
10 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 il the
theory generally accepted ~here-that the
ore solutions we're forced up by inHltrs.
ton and dynamic pressure from below-is
correct. that relating to the difference in
size Of the o~utcroppings Of Ruby Hill and
Prospect Mountain Is not without Q 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. 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 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
al valuable as those which we're excavsted
above. II Ia manifest that the limestone
bodies OF Ruby Hill and Prospect Noun
tain. at present separated by the granite
aud Prospect Mountain quartzite, we're
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 Ruby
Hill and Prospect Mountain Is due to the
erosion. Undoubtedly the erosion occur
red subsequent to the upheaval and rels-
tive creation of the Ruby Hill fault. There
can be bat little question as to the import
ant bearing Of thefault on the presentstruc-
ture OF Ruby Hill and Prospect Mountain
and the relation OF the ore bodies to each
other. The former has besn manifested
through diligent investigation instigsted
under national authority, and it lie 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. were conveyed to and deposited in
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
Of the Diamond mine is 1000 feet above
sea level. while that Of the highest point on
Ruby Hill is only 1900 feet or t~hereabout,
and the elevation Of the Ruby Hill crop
pings Is hardly more than 100 feet above
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 10 the
silver is increasing. The Diamond and
Excelsior mines are making . better show
ing than did the Richmond or Eureka
Con. At the relative points OF elevation,
and their present condition Ia an augury
that they will become as famous and equal
ly a. productive and lucrative 90 were the
Eureka Con. and Richmond mines 10 their
palmisst days. but deep level mining 10
needed a. much 10 the one 90 In the others.
xThs distinguishing names OF the formA-
lions OF Eureka District are local and were
irst adopted by Mr.. Arnold Hague. the
g~eologist In the field OF this division Of the
IT q n 2nrvav ~ tha Eavkiath D.r.IIa1 1