ae *

217 é

(48 d) Lord of the Isles No. 4 Deposit
LOCATION

This magnetite deposit is on a precipitous, southerly facing bluff,
about 500 to 600 feet north of the trail leading to the old whaling station
at Sechart. The location of the magnetite is about midway between the
showings on the Bald Eagle and Crown Prince claims.

Magnetite occurs at an elevation of 800 or 900 feet on the face of the
above-mentioned bluff. The bluff is too steep to support any timber and
only light shrubbery can cling to the rocks, which are mostly bare of
glacial drift. Hemlock, balsam, and cedar are, however, abundant along
the trail, 200 to 300 feet below the showing.

GEOLOGY AND OCCURRENCE OF MAGNETITE

This deposit is of no importance, so that only a brief examination of
it was made. The bluff is composed of limestone, and near the top a few
irregular masses of magnetite are exposed. In a small crevice, a tunnel of
unknown length (now inaccessible) has been driven, from which a stream
of water issues.

The following description of the occurrence is taken from Brewer
(21, page 26) who made an examination in 1916:

“The face of the bluff is heavily stained with iron from the decom-
position of iron pyrites, and the magnetite is mixed with pyrites, garnetite,
and limestone. An adit is driven towards the north in magnetite, along
a wall of green hornblendic igneous rock, for about 20 feet, then a belt
of crystalline limestone is exposed and the course of the adit changed
eastward. ‘This course is continued for about 37 feet, driven in magnetite
along a limestone wall on the north. At the face there is a winze, appar-
ently sunk in magnetite; this winze is of unknown depth and being full of
water could not be examined.

“The dimensions are 13 X 10 feet across the top, with the east wall in
igneous country rock that appears to cut off the ore. The adit is con-
tinued 40 feet northward in limestone beyond the turn to the east. It is
impossible to estimate quantity of magnetite from the work done, which
shows that the occurrence is very irregular in outline, lenticular in structure,
and apparently not very extensive, unless drilling should prove that it
maintains continuity with depth. The dip of the limestone wall in the
east drift is nearly vertical, and it is possible that the magnetite may
continue down along this wall.

““\ grab sample from the dump assayed:

IBYOM, Gao riencaasesoospnagoasransnedeponbsooucaad cousaaooUNZOaEDOSdNDGOD
Sulphurteeeereeeee :
Phosphorus...........

Insoluble matter

ORIGIN OF THE DEPOSIT

The magnetite is evidently a contact metamorphic deposit in lime-
stone, although the character of the intrusive rock is not carefully described.

VALUE OF THE DEPOSIT
The deposit is of no value as a source of iron ore.