Eureka daily sentinel. [volume] (Eureka, Nev.) 1871-1887, 1877-08-10

Captain Foley Tells the 0oshnmises
Something About che base Range.

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Something Abous she base R~mge.
The New York Mining Record OF
| August 2 contains q well written letter
from Captain Foley. II Is as follows:
Many who lave written glowing
panegyrics on the mines OF this (Eu.
reka) District have given vague aud
erroneous impressions abroad, from
the fact Of having had no practical
knowledge Of what they write about.
Prospect mountain, situated in vi near
the center Of the district, though a por-
tion OF the Diamond ange, stands
alone and isolated. In geological
structure 1t embraces the four great
classes Of rocks, namely: fossillIier-
Gus, volcanic, metatDorpnic and piu-
touic, which all are conspicuously dis
played within a very srnal area, with
their peculiar characteristics strongly
contrasted. Fossilliferous limestone
Is found on the slopes OF the mountain;
on the TANKS are belt vi quartzite and
conglOmerate, to which succeed belts
Of argillaceous shale, fianked by belts
Of metsmorphic limestone and other
strata containing siiicate Of lime. The
emerIence Of granite, greensboro and
kfhff1 hNtoo at Jig fuIldCts uTtll
they nave become expv.ed to view
In the northern spur of the
mountsin, are intrusive rocks of
later date than the others. 1t Is not
difficult to- form u true idea OF the pre-
else method Of granite uplift, whereby
the fossilliferous linsstones Of Pros
pect mountain became shaped into a
dome or arch ten or twelve miles
long, and of a. altitude of 1000 feet
above the level Of the sea. Prospect
mountain, rs seen from a distance of
eight miles east or west, has the arch
or dome shape Of the cretaceous pc
Rod, and by the testimony OF a fossil
SEA she'll characteristic of the cretace.
Gus period, the biv.lve of the clam or
cookie species, demonstrates the fact
hat Prospect mouuiain was at one
time under the sea The longitudinal
axis OF Prospect mountain runs north
anu South. while the metallic belt rep
resented IN the vein system of the
mountain, runs west and south
east. The age or origin OF the assures
OF Ruby HUI, a spur Of Prospect
mountain, !, precisely the same rs the
series OF assures Of the same mount.
ain. The dynsmical cause IL the same
Tor the cas- that those par
allel To each other were formed
at the same time, and the aye
IN that of tbs axis OF uplift.
The metallurgical classification OF The
ores oi this district results ia chasing
them as oxydized carbonated and au-
riierous lead ores, chloride aud sui
phureItet silver ores a little Hinged
with blue aud green c~arbonates OF cop
per. TIL re- are many we'll defined ore.
hearing channels in his district, the
principal vne OF which comes along the
eastern base OF Prospect mountain.
There Is no lode in Eureka District
hat can he traced as easily rs this
great ore channel extending from the
Richmond to the Hamburg. "A distance
OF three miles, every foot of which Is
claimed. The principal mines are the
Richmond and Eureka Consolidated;
and from the fact OF these
mines being in close proximity
la the same lode. has ari-en the
present great law suit between them.
the Rich,nond, mine the first in pres
-nt productiveness and among the
first la richness of the srsentif-rous
deposits In the State OF N-vada, Is 4
contact lode situated on Ruby HUI
Next IN point Of present impor' auce is
the Eureka Consolid%t ted in which ore
bodies have been found ranging from
three 10 four hundred feet wide. A
large tunnel is being run for the de-
velopment Of the ore bodies OF Pros
pect mountain. This tunnel will cut
eight distinct and seperate lodes. reach
ing the center OF the mountain at a
depth OF 1000 feet. There are many
other mining districts encIrcling Eurs-
ka, the most conspicuous being Silver
ado, the principal mine OF which is the
Rescue. A company has bsen organ
ized recently To work this property;
and considerable ore of u high grade
has been extracted proving the mine
to be of great pre- sent value and future
promise. j. NJ. FOLEY.