Eureka daily sentinel. [volume] (Eureka, Nev.) 1871-1887, 1877-03-23
TINE EUREKA LODE.

to q certain extent its value, the besl
evidence of which is the continued and
persistent bullion-producing qualities
which gives the locality in which it is
found an enviable status in the mining
world. 1t has been the misfortune ol
Eastern Nevada to have for its neighbor
a lode which has had no rival among
ore. hearing veins, and the fact was SO
patent that it has constituted itself a
gauge by which the more humble but
meritorious districts have been meas
nred, and anything that did not ap.
proach the standard of the great Com
stock has been regarded as almost un.
worthy of notice. This state of things
is the more to be regretted from the
fact that silver mining lisa business that
requires the help of capital intelligent
ly employed before the most valuable
discoveries can be utilized, and with
out its aid the richest mines lie idle.
The struggle during the early years Of
the district was a prolonged and toll
some one, rendered 10 in a measure
by the exceptional character of the ore,
which demanded processes that the
early pioneers were not familiar with,
and the poverty of those engaged in
the developments Of its resources. 1t
is hardly worth while to trace the
progress of the work, as il is a subject
that our readers are ainiliar with, but
it Is pleasant tn record the result and
know that, although we have only had
a brief existence OF eight years, suffi-
cient has been demonstrated to prove
that we are beyond the era Of expert
ment, and settled in life as a perma-
nent community beyond the reach Of
decay.
H EUREKA LODE,
A vein that has been explored to the
depth Of Que thousand feet, and a
length of five thousand feet, in which
ore bodies are met with at all points
within the vein formation, certainly
deserves to take rank as beyond the
reach of doubt as to its value and re.
liability. We have pointed out certain
reseinblances between the Eureka Tod
and the Comstock, in which we believe
we demonstrated \ close analogy. but,
as mentioned above, unscientiic per-
sons have reasoned hat because the
exact conditions of that lode were not
fulfilled on Ruby Hill there could be
no omparison between the two. Per
hapS not, but every one at all familiar
with mines, and who has gained that
knowledge in different localities, is
aware that in no sense is there any
universal law governing the dimen
sions, directions, changes n metal
iiferous contents of veins. Every sys.
tenn or group, and to some extent,
every vein, is a problem by itself; bu,
there are certain conditions to be full
filled before the term lode can be APP
piled, and other conditions as to what
kind of a lode it may he. All author
iIies agree hat the definition of a con-
tact loie is the existence of mineral
tearing matter in a assure occurring
between country rock of different
for nations. What the formation of
the country rock may be does not enter
into the question, AS the veins occur in
rocks ot different ages and geological
periods; thus the ores of Freibarg are
in gneiss, of Bohemia in sandstone
and quartzite, of Hungary in green.
stone,
OF CUMBERLAND,
In a~rgillaceous shale; on the Com
stock in porphyry and syenite, and
finally our own lode between stratitied
limestone and q%rartzite. The list
might be carried out to an Indefinite
extent and would prove that silver
b airing veins occur in different coun
try rocks, the origin of which are re-
- -.II~ 90 lsts~t ..nAIrl .,.1Z
and that each district in which a true
oniac vein is found has its W char
acteristics. and il it complies with
the broad definition, may still be
found to slightly differ from others OF
the same class. In the developments
Of what We shall term the Eureka loie,
from the Richmond on the north west TO
the JACKSON on the southeast. clearly
various points throughout the work.
ings at the groupings on the surface
and in the levels of the different
mines. These are so fully exposed
that we will not pnuinerate the differ
ent points, but if any OF our readers are
curious on the subject we will refer
them to tho testimony nf Clarence
King, Mr.. LucKhardt. Mr.. Reyes, and
other experts i'm The mining suits.
The filling of the vein differs from the
outside or country wall rock in being
metamorphOsed or silicified by the &C.
tion of heat or vapors probably due to
the thermal deposition of the vein.
There are many curious and
ENTERTAINING THEORIES
In regard to the filling of assures, but
the one generally accepted at the pres
ent time is that they are filed from
below by means of solutions held in
vapors and gases. This action would
metainorphOse the s~edimentary lime
stone in which the assure existed, and
In dissolving the carbonic acid widen
and enlarge the tissure. Wherever the
sillicious vapors We're the strongest
there we might expect to find the
greatest evidences of action. aud the
Tact is borne out in this lode. for the
nearer we approach the ore bodies the
softer and more broken does 1t te-
come and the more im%pregnated with
oxide OF iron. Between the vein mat
ter and country rock there i%nterposes
q selvage of clay, plainly showing the
line OF d~emarkation. Within the lin
its defined by the clay seam and the
quartzite foot wall, the ore up to the
present time has always heen found,