The Helena independent. [volume] (Helena, Mont.) 1875-1943, 1893-05-12
DRUM LuMM0N F|SsuRE
The Great Producer Is Described by
the Former Manager, Geo. H.
Robinson.
It Ii tho Primary Vein and Only
One Of Great Commercial
Importance.
The Alleged Foot Wal In the St. Louis
Trench not tho Drum Lum,non
Foot Wall.

The only witness on the stand yesterday
In the st. Louis Montana companies CASE
was George H. Robinson. tho former gem
sral manager of the mine On his direct
examination he dsscribsd the general assure
system Of the district. He stated that on
the west side of the Drum Lummon assure
system tho country is all granite, and the
central zone nt that point Is from one-half
mile to ono milo in diameter. The eastern
flank Of the granite. 10 called. refers to the
contact OF the states on the east OF that
zone. Pnralleling in I'M approximate direc-
sion 10 tho Drum Lun,mon vein which no
characterized as tho central tiRuto of this
system. being tho primary vein, and the
only ono of any great commercial import
ance. In this reference he spoke Of the
Drum Lummon fssure a. a system and not
. single vein. as there ara at least two
veins In the system. The Drum Lummon
fssure starta in. as far as any one knows,
near the central portion OF tina property,
aud extends towards the north and on the
east OF tho GRANTEES. At points there
are tongues that como up posi-
bly, 10 the foot walls. and 1t
may be possible in places they cross. al.
though that fact cannot be stated Oh such
only 40 a hypothesis. On the east OF the
assure system is what ia known as a black
dixie. Il is also granitic IN character. and
in some places it is 100 feet In thickness.
and in other places not so great. II also
dips with the vein system TO tho east.
Separating rom the Drum Lummon sys-
49, II -.L-A T. .t,--~ ~kotual aa kNA Jt1hSlnn
chute is tho Castletown lode. occupying o
r~osition to the east of the Drum Lummon.
and at oints it touches the Drum Lummon
vein before it reaches the No. l shaft. At
this shaft the Cnstletown takes a moro
e~asterly direction and departs from the
Drum Lummon into the hanging wall
country. approximately parallel with the
lines of the black dixie. intermediate be-
tween the granite dikos on the east and tho
nucleus granite on the west. the tissure sys-
tenn has forced its way through tne mag
nesian states. which have been tilted to a
high angle and are now lying on their edge.
Ths Drum Lummon fissure system has cut
through the states at On acute angle. both
in strike and dip. The foot wall of the
Drum Lummon fssure is always very hard,
very continuous and very permanent.
The character Of the ore in the CASTLE
town whore it makes payable ore bodies is
diatinctively banded. with the exception OF
the Jubilee chute, whore is felt the first In
fluence from this lode as regards the miner-
nlization of the vein. and at this point the
ore occurs more in the nature OF q breccla.
The nucleus granite contact Is a very irrag-
ular line in places. like the teeth OF q saw
but it is very cratic in places in Its direc-
ton. The witness was of the opinion that
tho contact between the granite and the
slate does not contain a lode or vein. and
that The granite contact in his Judgment
did not form the foot wall of the Dunn
Lummon. The material lying east OF the
contact is magnetism slate and whore the
contact approaches nearly up to the hgsuse
system at points the material Is considorA-
bly, altered. sometimes moe or less
crushed. carrying fssures that may be.
traced almost in any direction, and the ma.
terial il magnetism slate. nevertheless o
mineralized.
lively answered whether the Drum Lum-
mon over encounters the main body OF the
nucleus granite. 1t ia his belief that ii
does not. although there are places where
tongues have approached the vein md come
in contact. As to whether it has eyer
crossed or not cannot positively be an
swered as the hanging wall dixie is always
to tho east and the two cannot be separated.
"What effect does tho granite upon the ore
bearing qualities Of the veins in its vicinity
have?" ho WAS asked. He said the veins
occurring in the nucleus granite of the dis
trict are in eve J instance, as far as known
from present Developments. barren az re-
CARDS the commercial value. The only in
stance in the workings of the Montana
company is the North Star vein, and If this
were continued another 100 feet it would
encounter the main nucleus granite, 90 II
Nigh. be assumed that the GRANTEES ALWAYS
impoverish tho vein. He examined tho
apex trench made by the st. Louis com
pany north OF the moline. The so-oalled
foot wall in tho trench he did not consider
being the contact betweon the states and
granite. He had looked for a vein or lode
alleged to c"oBs the north end line OF the
st. Louis claim but never found one. He
said the Drum Lummo vein Apostle the
north end line of the st. Louis claim ap-
ground at a point thirty-fve feet east OF
the northeast corner Of the St. Louis claim.
and ia wholly within tho bounds of the
Marble Heart claim.
Tho Jubilee ore ia a brecciated ore. The
quartz would DO characterized AS . sugar
quartz, and the ore Is distinctively she snl-
phide. carrying ruby silver and some telra-
hedrite or q gray copper ore. The value of
the Jubilee at the 4OO-foot level is high
grade, but tho high grade value of that ore
was in silver; the value in gold per ton Ia
about the am in that ore, whether tho sill
yer values are high or low. ana as tho ore
gets low grade in depth 1t loses its silver
value, maintaining its gold.
In connection with his description Of tho
vein system Mr.. Robinson stated that the
Drum Lummon has followed a very hard
foot wall throughout its entire length. The
ore bodies occur in distinctive chutes
formed by swell IN the vein. which width ia
caused by an increase or bending of the
hanging wall. and they awe always made
into the hanging wall and not the foot.
Lund Is Acquitted.
When Judge Bucks court convened yes.
tsrdsy morning the july in tho case of tho
State vs.. Aug. Lund. charged with the pa
Aa.-;L-ae Aanio Aditahall,a ohild h..aaaL-