Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1897-06-19
Eureka District.
DEEPLEVEl MINING
The Ruby Hill Fault Fissure.
rs EXTENSION SOUTHWARK AND IN
rlUENcE UPON THE 0RE-BEARInC
STRUCTURE OF RUBY HILL AND
PROSPECT MOUNTAIN.
Ore Still Going Down Below the Lowest
Workings Of the Eureka Con. Mine
Improvement in Quantity and Quality
Of the Ore in the Diamond and Excel
siOr Mines as Depth is Attained--
The Proportion OF Gold Increasing.
TINE foRMAIIens WHICH ARE oaE-sfAR'
ING AND THOSE WHICH SEPARATE
THEM.
Addueed From the Records Of the
U. n. Geological survey Of she
Forsteth Parallel aua the Personal
Researeh of the Author.

R0Fltetn fnfAttet abU thc % ~'sfs-'
Research of the Author.
tWrinen for he Sentinel" {" ty NJ III. Jossph J
Mineral Hill, which occupies the north
ern slope OF Prospect Mountain. Is com
posed OF dolomitic limestone aud granite.
= The Prospect Mountain quartzise. which
there dipping to the northeast, forms the
footvsll Of the Ruby Hill lode. overlies
the granite aud bends around Prospect
Mountain 10 the east and west in the form
of . horseshoe, trending on the east side
10 q point northeast Of and near the Eu-
reks Tunnel and on the west side to an
other point extended westward from The
Grant mine. There 10 sinks beneath the
surface debris, but again appears above
the mountain quarternsry just southwest
OF and near the Prospect Mountain Tun-
mel. and still further south II underiies the
Prospect Noun tain limestone east OF and
near the Dug Out mine. On the east hank
Of Prospect Mountain the quartzite dips
10 the east. The granite, which owes its
exposure on the northerly slope OF Pros
pecs Mountain TO erosion. apparently dips
under the qusrtzite OF Ruby Hill. Pre-
yious to the erosion, the great belt OF lime
stone OF Prospect Mountain and that
which constitutes the Ruby Hill lode we're
presumably one and the same and formed
9 continuous body. The face OF The
quartzits dips under the limestone OF the
Ruby Hill lode at an average angie OF
soou. so aekIees " - ,i.as,"ns On ,hs
poss'e " 's'' oouy COO 49, &C., T,o,,
49, 80. o, a. ao,,hvas,
'u' n.o,ou - aah.,. :, sn,,ng
VII. ~. .u.,.s, .o. =, - "a hayond
49,. " Po'n, ha !. oa,,as 20 ~
-. .sooa .us . 49," p,o.as.,
pi 49,. .sn,s. "a peao,in linz,
s.a - pnhv HiiI
49,. a.. W ~ S. s.ri, Ss.n,a
s.,i.a - .'p,h. U,i s.ri, {" Tho wid,b
=, .ha ,ir.,nn. nna - nnhv uiI a, ,he
snrs.sa ~ ,,ons sno a. ooo sas,. ovsr~
is,ng 4, on ,ba noyth are The Secret Can.
h.,sns ,ha usr,h,rg liua.tone ~
!on sna'1 gs,1 anu 'pe nnu,ui s ~ r.",o,,o
nas @ Ia =, ,p.s.rso, IIonn,.;U
spohh hs,s ~ H.mhn,. iima.,ona which 4.
,..a,as. -. san,h s.aa.,h
sSs..as -i.h 49,, =, ad.ns hin Tn-
.s..sn,a. ,hosa ,wo hod,ss a, he sn,,scs
80, sn.ca ~ .hou, q nOo ,est Il tba
pogonin Iimsstons. which rnns in a eon.
,,nro,s hsit ,hronoh tha e.stern nortIon
- tha dIs,r;o, from Diamond ValIsv
no,,h NJ ,hs Rnilvh.cLar mine 10 Newayk
ysllev ON the sou,h. Oyerlyinp the Ham
hn,e limastona ~ proarsc, Mo,ntain is a
hsnS ~ sygilsoeons an /. Ia Identic.l I'm char.
seter with th., which overlies The north.
ern mari q, The Ruby Hill lode. but known
A. the Hamburg shsle. Nearly Ali OF
THE orr RonIrs
OF considerable magnitude and economic
value thai were discovered In Eureka Dis
trict nm 10 the present time were in the
Prospect Mountain and Hambnre lime
stone formations. OF the Cambrisn Age.
but valuable deposits OF ore have been
found In the Duilwhscker and Williams-
burg minss. which are In the Poeonip
limestone and quartz porphyry of the ST.
lurian Age. Very rich ore has been found
In paying deposits In the mines OF New
York Canyon. in Lone Mountain lime
stone. also Of the silurian Age. The Lone
Mountain limestone IA senarstsd from the
Pogonip limestone by the hard ouartzite
reef of McCoy's Ridge. This dnsrtzlte
extends nortbward to Csriboo Hill and