Tonopah bonanza. [volume] (Butler City [i.e. Butler], Nev.) 1901-1909, 1909-02-13

Hon j. w. Deane, II is nlBn
authority in mining circles
~ybat is a vein" has been much
..od Of late as to the conditions
4 Goldheld formations.
cynical vein is that condition Of
,.aterial, unlike that which it in
',oses. resting between materials
no or unlike as to each other, and
n,oh has the three dimensions of
,0noth. bredth and thickness, and
AZ latter dimensions may be barely
.oro than a strain, or 1t may be
hundreds of feet.
The content of the vein thickens
and thins, sprangles ~irregularly,
and the ores have tendency to center
into masses, usually l%enticular, with
edges as irregular as the most
etched s%eacoast. Shoots may lie
ante close to shoots, or they may be
hnndreds Of feet apart, the interval
nd low in value to remove except In
eyploratOry Work.
The immense vein at Aspen, Colo
ado. consists of all the formations
that are included between the sand
stone hanging wall and the granite
foot wall, both barren, and is made
nm of carbonate of lime, lime dolo-
matized, shales, v~ariously mineraliz-
% accumulated materials of sedi-
mentary origin, layer upon layer,
whose so degrees tilt was given by
the uplift of the underlying granite,
and the porphyry, whose intrusion
had beer made possible by that up
Mt. and whose ramifcations were
between the folds It could separate.
following planes of least resistance
naturally, and whose heat had great
or or less degree metamorphosed
Surroundings, even to the extent OF
npregnating masses of a%bsorptive
rock with minerals Though vaporiza-
ton.
Mineralizations is the accidental
feature of these veins, whose perfec'
ton has no regard to the values that
they may or may not contain.
COMPARED TO A PIE.
A homely illustration may b.
drawn from a pie, the crusts bein;
walls. and the whether or not palat
able content completing the smile.
Our mining laws are based upol
the then uncertain conception OF hs
sure veins or conditions. which seem
TO have been that of a nearly vertica
crack in granite, filed with ono
molten material which welled III
forced by expansion, to occupy tn
prepared place, coming quite to q
vithin ten feet OF surface and i
vdth to be covered by the dinner
ans of a shaft, and hence the al
mrdity OF the requirement to "sin
a shaft to a depth Of ten feet frol
the lowest rim thereof to a well-d'
fined erevice, as applied to cond
lions as we know them.
We find minerals arranged with
wall OF mud upon one side, wit
boulders forced into planes that co.
fine, outcrops that rear amid deti
tus, and almost any appearance g
cept that the law defines. This e
pensive nonsense has cost. in its co
Trajectory calculations, the hero
struggle to adapt 4 law to %conditio
that its empirical definition did II
embrace, a grand per cent OF the I
tai that mines OF the west have pr
duced.
Beginning thirty years ago, we u
dertook the demonstration OF Z
walls, and made stout contest thu
though dissimilar, they were wa
which, taken together with their
eluded content, made a vein, and
the cost OF millions we forced {
supporting judicial Endorsement.
THE CONTACT VEIN.
To compass that definition we
vented the term contact vein" TO
Ing a new employment of a 81
s~tantive converted to adjective du
Then We CHANGED upon the try
condition Of a vein with n sh
tered wall. the hanging portion
Ing a conglomerate broken and
terminglingly confused. and judo
gravity finally recognized this v
whose upper crust was thus brol
and eroded, but the very duce was
pay when the hanging wall exten,
as a blanket and the foot wall
cociously went to smash, and
content Of the vein, released che
cally, percolated at pleasure and
portunity. and we had to cont
ior this a tip-over and disturba
IN the process. We drew sharply
definition of rock" and me
merely a material whose grain
texture permitted classification.
whose homogeneous consistency
quired blasting to shatter.
me theory on which the law