The Anaconda standard. [volume] (Anaconda, Mont.) 1889-1970, 1899-10-11

cifc gravity of these samples deter
mined. Why did you do that?"
ITO ascertain if one were heavier
than the other
How would that tend to distin-
guish the rocks apart?"
1T would tend to discriminate
difference between Them
you next had the minerals IN the
samples determined. Why did you do
that?"
in order to determine second diff.
ference by showing the presence OF
certain conditions in connection with
some samples and not with others.
Mr. King went into the technical
differences in the chemical and MINER
al relations of the samples experiment
ed upon. One difference shown was
that the porphyry was heavier than
the clay: another and marked diner
ence was that there was much more
alkali in the porphyry than IN the
clay.
There were differences shown as to
all of the other minerals tested Tor
also. -.
Five determinations show great diff
ferences in the rocks said MI. klng.
The test for moisture resulted, as all
the other tests, in showing decided
| differences.
The absorption tests were made in
| still water, and the relative quantities
Of water absorbed by the samples also
showed distinguishing differences.
| In the drying process a marked diff
ference was established between the
| samples.
The clay samples absorbed six times
as much water as the others in the
first hour of the absorption test, and
the total results showed an enormous
| difference said MIR. King. 3.
A diagram was produced, showing
| the great difference in the absorbing
power of the rocks. Mr. King explain
| ed the diagram. and showed how the
! line representing the clay expressed
something like nine times the power
of absorption expressed by the line
representing the porphyry.
DO your experiments show anything
more than the great difference in the
rocks?" asked MIR. Patterson.
mo: the results were as anticipated,'
said Mr.. King.
Mr. King next described a crush
ing test to which samples of the quartz
porphyry and the indurated clay were
subjected. This test was made in or
der to determine the relative resisting
| power of the two materials. Prisms
of rock were used which had two
smooth parallel surfaces about an inch
square, and the prisms were about the
| same size. A standard crushing ma
chine habitually used to ascertain the
| compressive resistance of rock was en-
ployed in making the test
The results showed that the mean
pressure that three samples of por-
phyry resisted was 6,625 pounds, and
! that the mean pressure required to
crush them was S.S75 pounds. The
mean pressure three samples of the
| indurated clay resisted was 3,lOO
pounds. and the mean pressure requir-
ed to crush them was 5000 pounds.
| hal
resisted by and the pressure which
crushed the porphyry was 2,225 pounds,
while the difference between these pres
sures as connected with the indurated
clay was only 200 pounds. The resist
ing power of the porphyry was 127 per
| cent greater than that of the clay.
Mr.. King next introduced a number
! of samples from the faults in evidence.
He then described the characteristics
of the various samples. There We're
samples of blush gray clay and of
whitish clay. The witness was con-
WINGED of the identity of these clays
| Another sample, he said, was brec-
ciated material cemented with hard
cement and hard to break. This ma
terial is found only above or on the
line of oxidation in the mine The
brecciated material on the lower levels
4 is soft and has no hard cement. One
| whitish clay sample contained ore that
rites. Another was hard clay, and
carried an intrusion of quartz porphy-
~ with pyrite seams. Another sam
pie of the same clay carried a distinct
mass of solid sulphide ore, and the
ore contained copper In the breccia
adjoining this clay is an intrusion OF
vein quartz, the witness said. In
another sample of the same material
was a rounded ball of quartz porphyry
This ball of quartz porphyry is con-
tanned in the very material that wit
ness for the plaintiff alleged was quartz
porphyry ITSELF" said Mr.. King.
I'm my opinion the grayish and
whitish materials are the same, and
part of the clay SEWAGE" he added
He said that the hardening of the
clay was due to the cement formed at
the time of oxidation. The cement
is very tough, he stated He had made
no study of it, but it may be per-
oxide of iron and silica combined,
This material is not confined to the
locality where the Tower sample came
from I saw large deposits of this
pseudo-porphyry at other points. l
know it to be nothing but the clay sell
wage of the vein," said Mr.. King.
The witness next took up the mi
croscopic slides of porphyry and clay
made for him by U. S. Grant. He said
that he had had three slides made by
Mr.. Myers of Helena before securing
the services of Mr.. Grant, but those
slides were imperfect and one was de-
stroyed by an accident, hence his re-
course to Mr.. Grant. Seven of the
! slides made by Mr.. Grant were from
the same blocks of material used in the
chemical, absorption and specific gray
ity tests.
What was the object in having these
slides made?" asked Mr.. Patterson.
"They were made for the purpose OF
an optical examination, in order to de
termine any differences between the
clay and the porphyry," said Mr.. King
Gould you determine what the rock;
! were by that?'
II could determine enough about
their structure and constituents to sat
isfy me-
Did you make the determination?
Yes
And did you decide what We're the
L materials?"
4 "One is quartz porphyry and the Other