109

a granular, schistose aggregate of quartz and micaceous hematite occurs in
lenticular veins and stringers in a greenish, siliceous sandstone.

Fragments of magnetite and hematite associated with red jasper are found
_ in the Bonnet Plume and Snake rivers. Similar float is widely distributed over
a great part of the Peel River basin -

LEAD AND ZINC.

_ Deposits of galena and zine blende occur at a number of points on the south
side of Great Slave lake about 9 miles inland from Pine point. The country rock

is a porous, crystalline, dolomitic limestone interbedded with a pebbly lhmestone ©

lying either in a horizontal attitude or in gently undulating folds. Outcrops,
however, are infrequent and the whole region is heavily wooded. Two systems of
fracture planes traverse the rock striking north 25 degrees east and south 80
degrees east. The deposits are replacements along bedding or fracture planes and
consist of coarse galena, light-coloured zine blende, and some iron pyrites. Con-
siderable money was spent in 1920 testing these deposits and the results have
been reported as encouraging.

Argentiferous galena containing 38: 86 ounces of silver to the ton of pure
galena is stated to occur at another point in the vicinity of Great Slave lake east
of Resolution, but the exact locality is not given.” The rock is described as “an
association of grey mica schist with a white subtranslucent quartz, more or less
thickly coated with hydrated peroxide of iron, carrying some coarsely erystalline
galena.””*

NICKEL

No nickel deposits that are of economic value under present conditions have

been discovered. Nickeliferous sulphides, however, occur at the east end of lake -
Athabaska; and there has been considerable prospecting and a number of claims .

have been staked. The geology of this region was examined by J. B. Tyrrell?’ in
1892 and by F. J. Alcock® in 1914. An examination of the mineral claims was
also made by Charles Camsell in the summer of 1915.

“The rocks’ of that portion of the north shore in which the mineral claims
were located, namely from the Paris group near the mouth of Grease rivér to
Camille bay, belong to one or the other of the following groups:

(1) A complex of highly foliated and often contorted crystalline rocks of
a gneissoid character, the oldest formation in that district.

(2) The Athabaska sandstone, flat lying and undisturbed on the south
shore of the lake, but somewhat disturbed and metamorphosed to quartzite on the
north shore where it comes in contact with the norite.

“ (3) A foliated norite younger than, and intrusive into, the Athabaska sand-
stone as well as into the gneiss.

“(4) Dykes and sills of diabase which are probably genetically connected
with the norite.

1 Geol. Surv., Can., Ann. Rept., vol. XII, p. 36 R.
2Camsell, C., Geol. Surv., Can., Ann. Rept., vol. XVI, p. 46 CC.
3 Bell, R., Geol. Surv., Can., Ann. Rept., vol. XII, p. 103 A.
4Geol. iSurv., Can., Ann. Rept., vol. XI, p. 33 R.
5 Geol. Surv., ‘Can., Ann. Rept., vol. VIII, pt. D.
.6 Geol. (Surv., Can., Sum. Rept., 1914, pp. 60-61.
7 Geol. ‘Survy., (Can., Sum. Rept., Co. pp. 123-126.

15850—S