The White Pine news. [volume] (Ely, Nev.) 1906-1910, 1909-09-26

bathOlith of quartz mOnzOnite in
vades the Cambrian limestones and
states, which are altered to a dense
garnet rock for a distance of from
1000 to 5000 feet literally from it.
East of this and running northerly
about two miles to Seligman Canyon
brown granodiorite.
Between the monzonite dome and
the garnetized limestone is from SO
to 500 feet of brown porphyritic gos-
san, while at or e the contact of
this and the garnet rock, are veins
and stringers of copper ore; native
copper, ~chalcopyrite, bornite and cop
per ~carbonates were observed. Up
to the past year practically nothing
has been done in this locality to de-
velop these ores. In 1907-8ssome
development work not on an extern
sive scale, however, was accomplish
ed. While non of the openings ex-
pose the country to much depth, the
showings are encouraging ands the
intelligent expenditure of money here
may open up workable copper de-
posts.
The lead belt lies about midway
between the silver and copper belts
both geologically and geographically
and along the east base of White
Pine mountain. The mines in this
belt are almost wholly within the
Lone Mountain dolomite, the upper
member of the Silurian. By some
unexplainable dynamics the dolomite
has been extensively faulted, while
the formations between which it lies
have only been folded. Within this
formation, and more narrowly within
the faulted areas, occurring in beds
and assures. the remarkably high
grade lead ores are found.
The Great Valley and Mother Lode
mines seems to mark it's southern
limits, and it ends to. the north where
the great east and west fault sub
merges this formation, giving it a
length of over five miles.
These deposits were discovered
shortly after those of Treasure Hill
and several early attempts were
made at smelling these ores. The
crude methods and prohibitive trans
%portation charges, however, made
lHtll uupI OHldDle DIT Tie line. L WO
decades later, when mining had been
abandoned on Treasure Hill, atten-
ton was again directed to them.
More favorable market conditions
made it profitable to export the best
grades of these ores to Salt Lake and
San Francisco for reduction, and
from these mines have since come
the ores that have employed, for
more than 20 years, the small re-
naming population Of the district.
The fault fissured zone, in which
the mines on this belt occur, varies
from 800 to 1900 feet in width; in
position above the Pogonip and below
the Nevada limestones, and bounded
on the east and west by fault ifs
sures both of which are mineralized.
The west fault dips east at As de-
grees ad is conformable to the
foot wall. The east fault stands at
a much higher angle, probably rs de-
grees, and cuts the bedding of the
hanging wall at nearly right angles.
Thus a wedge shaped body of shat
tered dolmite tapering downward
fills the displacement between the
major faults.
Both assures are lines of great
displacement. Along the east fault
in places, the White Pine shale is
brought down to the dolomite, indi-
eating a throw of about 1000 feet.
While on the west fault the displace-
ment appears to vary from 100 to
1900 feet over most of it's length.
submerging $50 feet of Eureka
quartzite. In four isolated places.
however, the Eureka quartzite is
left lying undisturbed against the
Pogonip. AS the main faults, it may
be termed the gangue or vein stone.
as a whole of a single fissure vein.
The alteration of the dolomite nv
contact metamorphosis is remark