47

On the divide between the south fork of Mudflat (Pangea) Creek and
Porphyry Creek, a pyrite vein was prospected by a 25-foot adit some years
ago. The vein occurs along the contact of a lamprophyre dyke with
argillites. It is lenticular and less than 25 feet in length.

At elevation 5,100 feet on the north side near the head of Porphyry
Creek, pyritized argillite beds interstratified with greywacke and shales,
which also contain a little finely disseminated pyrite, are prospected by
several open-cuts and by a short, inclined shaft. In the vicinity the sedi-
ments strike west and dip 10 to 15 degrees north. They are intruded
by several dykes of granodiorite, and the granodiorite stock that forms
the core of the mountain lies a quarter of a mile to the west. Samples
of the pyritized rock assayed only a trace in gold and silver.

Black Prince Group (29)

References: Ann. Repts., Minister of Mines, B.C.: 1913, 107; 1914, p. 205; 1916,
p. ee 1918, p. 118. Geol. Surv., Canada, Mem. "110, p. 25: Sum, Rept. 1924,
pt.

The eee is on Rocher Déboulé Mountain, 6 miles south of New
Hazelton at the head of Mudflat Creek. A branch road 1 mile in length
leaves the highway 5 miles southeast of New Hazelton and runs to the
foot of the mountain, from where a pack-horse trail 5 miles long follows
up the north side of Mudflat Creek Valley to the prospect. The cabin is
on a flat bench at elevation 4,150 feet, between two small lakes, and the
workings are a short distance to the south on higher ground. This group
is owned by Mrs. B. Sargent of New Hazelton.

A sheared zone containing tungsten and a little molybdenite occurs
in the granodiorite about 1,500 feet southwest of the contact of the
intrusive with sedimentary rocks lying to the northeast. The zone out-
crops on a 45-degree slope between elevations of 4,650 and 5,000 feet.
Below 4,650 feet it is covered by talus and above 5,000 feet it follows
along the top of a flat ridge for about 500 feet. For the first 100 feet
along the ridge it is exposed by three open-cuts, but for the next 400
feet is covered by talus and then outcrops in a steep bluff. The zone
strikes south 30 degrees east and dips from 50 to 65 degrees southwest.
The sheared zone ranges from 1 to 8 feet in width and contains from
one to four parallel quartz veins ranging from 2 to 18 inches in width.
The quartz veins and the sheared and altered granodiorite are mineralized
with variable amounts of pyrite, chalcopyrite, molybdenite, and wolf-
ramite.

In the lowest cut at elevation 4,700 feet, there is a single sheared zone
ranging from 1 to 8 feet in width. It is rust stained, and over a width
of 6 inches along the hanging-wall side is impregnated with pyrite and a
little molybdenite. In a large open-cut at elevation 4,950 feet the sheared
zone is 5 feet wide. From east to west it consists of: 6 inches of sheared
granodiorite replaced by quartz containing pyrite and molybdenite; 3
feet of altered granodiorite; 12 inches of sheared granodiorite replaced
by honeycomb quartz from which considerable pyrite has been leached,

94295—43

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