35

GENERAL DESCRIPTION

The property was examined by C. O. Swanson, field assistant, from
whose report the following account has been compiled.

Along the bed of the northerly of the two streams are exposures of
“greenstone”. At an elevation of 160 feet is what may be an outcrop,
measuring 3 feet by 3 feet, of magnetite, but possibly is a boulder. Magne-
tite is reported to have been found in this general vicinity, but no other
possible outcrops were seen. At a waterfall on the southerly of the two
streams, above the ending of the trail, hornblende-rich diorite is exposed on
the two banks of the stream, with, in the stream-bed, a 12-foot band of dark,
very fine-grained “greenstone” which extends upwards along the course of the
stream. Forty feet above the falls, magnetite is exposed in a zone 2 to 3
feet wide traversing “greenstone,” but bounded on one edge, for a few feet,
by a small patch of coarsely crystalline calcite which in the form of stringers
also extends into the adjoining greenstone. Outcrops of magnetite are
traceable eastward nearly continuously for a length of 25 feet and at inter-
vals for 35 feet farther to where the magnetite is represented by an outcrop
measuring 2 feet by 3 feet and bordered on two sides by a dark porphyrite.
The magnetite appears to occupy an area with an elongated, oval outline
striking east-southeast, a length of 60 feet, and a maximum breadth of 12
feet. The body contains much garnet, in places amounting to 50 per cent
of the whole. On the west side of the stream bed magnetite with garnet
also outcrops and may belong to a continuation of the above-described body
or may be the eastern end of another deposit. No other outcrops of
magnetite were found in this general vicinity.

The deposit, so far as known, is small and the iron content is low.
The occurrence does not appear to be of value as a source of iron ore.

(10 c) Modoc Mineral Claim, Harriet Harbour, Moresby Island
LOCATION

The magnetité deposit on the Modoc claim may be reached by the
trail which leads from the southwest angle of Harriet harbour, along the
clearing made for a proposed tram-line to the Copper Queen. The trail
follows a nearly due south course and 700 feet from the beach and at an
elevation of 200 feet crosses a small stream coming from the west. The
outcrops of magnetite on the Modoc claim are situated 300 feet up the
stream.

GENERAL DESCRIPTION

In the bed and banks of the gully in which runs the stream referred
to above, are exposures of fine-grained, dark, igneous rocks much fractured
and cut by fine-grained, porphyritic dykes. On the south bank in a small
opening is a patch, a few square feet in area, of pyritiferous magnetite with
much admixed rock matter. Twenty-five feet farther upstream is the
eastern end of a mineralized area 45 feet long and 10 to 15 feet broad.
This is occupied by magnetite with masses of country rock, stringers of
calcite, and much pyrite which in places over widths of a foot or so forms
one-half of the material. In other parts very little pyrite is present.

No other mineralized outcrops were seen on the property. No body -
of iron ore of commercial quality or size is visible.