The Anaconda standard., 1898-03-11

fssures or seams are formed in groups.
In the space of 100 feet you VIII ma
20 assures. and in the next 100 feet you
viii find some assures. but smaller ana
not so well mineralizcc. There are sew
eral groups of these assures.
observing the fissures more closeiy,
the source and mode OF mfneraiizatlon
can be seen to be the same in all and 1t
Is plain in my mind now II occurred.
The source of naturalization was 1fofn
below by means of these hssufes. some
of the assures were more open ana re-
ceived more OF the mineraliZation 0th-
ers We're harder and got little. IhsTe
are different degrees in each fissure. but
the heart Of the ore body when found
is generally In the original fissure. Ine
further you go from the center Or II.
the less intense becomes the minerallza-
ton. The mineral bearing waters have
dissolved the original rock, mica ana
feldspar, and put in its place the cop
per mineral. From it is less ana less
copper until 1t fades into the country
rock and is not worth stopping. Inc two
original assures have become one
through the mineraliZing OF the cOun-
try rock between.
Il find in this Harris & Lloyd tun-
mel this naturalization which causes the
adoption of the word zone rather than
vein or lode, because it is not one large
fissure vein. Always IN Butte is round
number of veins. The Rarus vein,
Just like the Anaconda vein is group
of assures united into one lode by the
| mineralizing of the country rock be-
tween.
speaking of the Rarus lode itself and
it's development, there are SIX pfin-
ciple ore bodies in it, the one further
est to the north being 200 rect from
the one furthest to the south The
first to the south has not been stopped
on as yet, but 1t has width to the
eye of about 80 feet The second ore
body has been stoped out and is ~ feet
wide. The next three ore bodies have
been stopped and are each 10 feet wide.
The sixth ore body is furthest to the
north and has not been stopped on. 1T
is fcur or FIVE feet wide. Hence we
have altogether S5 or 80 feet OF pay
ore
The witness then went into a very
particular and exhaustive description
Of the ore bodies and of the mine IN
general He showed two samples of
rock, the white being porphyry and the
greyer samples being granite. Both
showed the seams interlacing III all
directions. Then Mr.. Boehmer re-
sumed:
"A fault is the fracture of the rocks
of a mountain and the relative dis
| placement of the rock on either side
| A mountain of granite when fractured
| is difficult or impossible to follow, for
| the granite all looks alike and you can
| not tell how much it has been moved.
| If IL We're sedimentary rock such as
| limestone or sandstone it could be told
easily how far it has been moved. On
| the Rarus hill is no such rock to meas
ure the amount or direction of faulting.
We have only granite and porphyry.
But the porphyry is not sedimentary
| rock and is found in all shapes ana
/ places. No mining camp is worthy of
/ the name without this eruptive rock,
! porphyry. 1t Is closely connected with
| the formation of ores
| Il have tried to estimate from the
/ porphyry the amount of faulting, but
/ have siven Ii up as bad job. The
! bodies of porphyry cannot be connected
! and nothing can be proved by their
| position. So, to estimate the continuity
we had to look at the seams. Tie
| streaks of ore go through the fault and
keep on going. The streaks have been
/ fauted and broken and thrown slight
4 ly but not enough to throw 1t out Of
/ the drift it was following. 1t turns
/ slightly.
Between the fault planes there was
! evidently q secondary enrichment OF
| mineral. This was facilitated by the
crushing of the rock between the fault
I planes SO that the ore streaks devei-
oped into great ore bodies between the
+ fault planes. I had drifts driven to
! show this. In the crosscut driven from
! the No / shaft on the 600, north and
south. | put a drift to the side. In the
| drift was an ore streak which deyei-
oped into a big stope. There you could
see the fault crossing very plainly
The ore streak went through the fault
all right, except that it was broken
and disconnected. The largest dis
placement was is inches, and there
was. perhaps. drag of four or five
! feet"
Mr. Boehmer was examined very
/ c.osaly as TO the streaks and described
them. their number, location, direction
size, intersections etc, with great
minuteness Before the direct cSanii
nation was concluded the case was
adjourned until 10 o'clock this morn
/ ing.