Eureka daily sentinel. [volume] (Eureka, Nev.) 1871-1887, 1882-09-07
FiSsURE VEINS.
They Mey Trend Fast and West
and Sill be Rich.

and Sill be Rich.
1t will not do to conclude, says James
Delavan, in a letter to the New York Min
ing Record, that there are no veins whose
trend is not n~ortherly and southerly that
do not prove that they extend downwards
as far as those whose trends are northerly
and southerly, and also retain their width
or grow wide as they extend downwards,
as we'll as their richness. AS a general
thing the trend OF assure veins is north
erly and %southerly, and but comparatively
few are easterly and westerly. 1t is true
also that not all of the former contain
sufficient of the precious metals to be
worked at a profit, as well as many OF the
latter. The rule that assures must run
n%ortherly and southerly and not e~asterly
or westerly, to be valuable, may do in
some localities but not in others. In Es-
meralda County, this State, the course of
the veins is easterly and westerly, and
many OF them have proved by actual
working that they retain their richness
and increase in width and richness to the
depth of 900 feet or more.
The Northern Belle has been working
for many years, and has yielded a large
amount in bullion, disbursing to the
stockholders an immense amount in divi-
dends. There has never been an ASSESS
ment levied on the stock. The mine has
been opened to the tenth level, but whether
that means to a depth of 1000 feet or not,
l do not know. AS a general thing here,
the levels are one hundred feet apart, and
the tenth level would be 1000 feet below
the surface. At any rate, the workings Of
the Northern Belle and Mount Diablo
mines have proved quite conclusively that
an east and west tissure vein is not to be
despised. 1t is well known by the explora-
tons made on easterly and westerly veins
in Esmeralda County, that they do no3
give out or become barren within the
first fifty feet" There are hundreds Of
mining locations on which depths Of fifty
and one hundred feet have been obtained
and the quality OF the ore found to be as
good at the lowest depth as at the surface.
They have not ''petered out" nor become
barren, but in most cases have grown
wider and richer.
The Comstock mineral belt has a north
erly and southerly trend conforming to
the course of the mountain ranges here
and in almost all parts of the world. The
rock strata in the mountains are north
and south in course, and the assures that
have occurred generally run in those
directions. l think that where q assure
has been opened in an easterly and west
erly course it is where in a CONFUSION of
nature the course or trend of the noun
tain range, or q portion of it, has been
thrown around so that the strata of rock
would lie easterly and westerly insteat of,
as Is generally the case, northerly and
southerly. Why the trend Of mountain
range is so generally to the north and
south may DO attributed to electricity, or
the attractions at the poles. Iu a locality
where the strata are northerly and south
erly, the assure veins generally running in
the same direction, there may occur occa-
sionally what are called cash veins, run
ming in a right angular course across the
strata OF country rock, and such are not
assure veins and do not amount TO much.
There are other localities where the course
of the strata is east and west. and the
assures. following the same courses may
contain as rich and permanent mines as
those running north and south, and q
north and south vein there would be
nothing more than a cash vein, and be of
but little value.
The condition Of things is the same in
Tuscarora District and in that section of
the country in Elko County, in this State,
as in Esmeralda County, the assures are
east and west.
We all know that the Grand Prize,
Navajo mines and others have been opened
to q depth Of several hundred feet and
what the result has been.
The assures in Eureka County have a
n%ortherly and southerly trend. Those in
Bodie District, Mono County, California,
have the same. 1t may be set down as a
rule that where the trend of the stratiica-
ton of the country rock is to the north
and south, the assures will be opened in
the same direction, and also that where
it is to the east and west the assures will
follow that course. Any variation from
that rule where a vein is found to run
across the qualification "a cash vein) it
will not be found to be of much value, as
1t cannot be depended upon as to EXTEND
ing to much depth, and will soon dis
appear entirely, or become barrsn.