Carson City daily appeal. [volume] (Carson City, Nev.) 1907-1930, 1911-04-22

piaCerS, III WHICH IL gnu mas oeS
concentrated by natural processes,
available sources OF the precious
metal might be expected. it Is clear
that this strata is one OF the oldest
formations found in the State OF Ne
vada. where the modification OF rocks
has taken place, especially in reglons|
OF gold bearing quartz veins where
the presence in rocks OF impurities
that have been rotted and %soitened
by the decompoSing pyrite so a rusty
condition replaced the bright coiors.
Such d~iscolorations extend over an
area in and through the immediate
vicinity, which is an indication OF the
presence OF quartz veins bearing per
itiiorous minerals. The gigantic and
granite appears to have been intrudcd
between the layers OF older lorna
it has originally been strata OF depo-
silion. This i to be seen III most
~gold-bcaring districts where the
quartz veins are parallel to >ucl
structure, and again we find the blue
granite and cyanide making its pres
ence east Of the porphry dyke, which
is generally solid and rusty and soft
ened by decay, especially where trav-
rrsed by collaborating VEINS, which
,,.. ,h>p,s.luas Ia th. result nt de-
cay, the silica being transformed
from the body OF rock and aggre-
gated into lodes, although in my
Judgment, when greater depth Is OBJ
tanned, you will find the ore changed
to ,ulpbide ore carrying gold. silver
and perhaps copper oi good value.
The general formation OF the entire
group is we'll mineralized. as II one
would observe. Contact zones and
ore bodies in the contact zones o
igneous rocks, the passage oi vapor:
and the movement OF heated solu
, tons in them combined often will
their W chemical composition
which causes them to react with these
solutions, have made them especially
favorable places for the deposit o
cause a reduction OF volume. The,
become more porous II not too deep
ly buried and permit more easily thu
circulation OF fluids. As a result o
this, we find many valuable deposit
OF old, silver, copper. lead. etc, iron
magnetic waters in sucn contac
zones.
In places in the mining regions o
the Rocky Mountains. the contact be
masaed granite, %porphyry. cyanide
dirite, etc, from some elevated point
! may be followed with the eye 10
miles by the successive mine pits an,
heaps thrown out from prospects. al,
is so well known that contacts be
tween porphyry and other rocks ar
eagerly sought by every rroSpectol
We find cropping through tn
eight claims these porphyry dyke,
or series OF dykes that traverse thi
property 40D feet in length and iror
500 to 2OO0 feet in width. crossing iror
north to south, which is a large fs
sure Of the old formation. Their
has been a later eruptive activit
which has caused intrusive shoot
to raise through those porphyr.
quartz dykes, which would lead som
TO think they were cross veins. Afte
a close examination, | find it to be
running in a northely and southern,
direction, filed with decomposet
porphyry quartz which is carrying
values, as tests will show in this re
port. These tests were made by dit
ferent men OF experience whose rep
utation cannot be questioned. and diff
Ter some III value. ! find a number o
crosscut test pits on the surface Civ
ing values from $500 to 5000 per to,
on ore across the lodges, which j
extended down to the water level
would be almost inexhaustible il
quantity, and there is no doubt wher
the water level is reached at approx.
imately 800 feet on the Sunset claim
snlphide ore will be encountered
ORIGIN OF ~PORPHYRYETIC
TEXTURE
In the case of many ELUSIVE rocks
or lavas it is easy to understand why
they have porphyryetic texture. The
lavas OF many volcanoes as they is
sue to the outer air are full of grow
ing crystals, often Of considerable
size, suspended in a molten fluid, the
latter however, subjected to new con-