~162~

south of Decker lake there is extensive alteration of the
volcanics to a light grey material. Irregular, narrow deposits
carry copper, or copper and zinc; they are low in gold. An
assay of the altered volcanics showed no gold ner silver.

West of Tchesinkut lake on the Northern light property

a
(Mona~(?) 1929, page 181) in ondesite porphyry near a small

quartz porphyry stock narrow widths of rock are sparsely mineral-
ized with copper, lead, zinc, barite, and fluorspar, iow in
: 3
silver. On the Gamble= (1930, vage 145) property, 15 miles north
of this, there are similar narrow deposits sparseiy mineralized.
1 1923+ 4/8
The Oakla property— (1924;—page—119) near Frengois lake is of

interest because a very narrow vein of quartz and pyzite showed

0.54 ovnce a ton of gold.

a:
— Ann. Repts. Minister of Mines, B.C.

—_——_—

In general the deposits of this erea carry very little

gold and silver and are in the main small and irregular.

Burns Lake (Burns Lake to Sheraton)
The Mesozoic rocks here are mainly granodiorite and to

a lesser extent granite, which appear to grade inte one another
and are probably of the same age. They show a wide range in
texture and in colour from red to green. They cut and include
many Rises of volcanics (andesite and dacite) and diorite. They
are cut by innumerable dykes of dark end light green andesite

and basalt, which though much younger in age, cannot in many
places be distinguished in the field from the older volcanics.
They are also cut by dykes up to 100 feet wide of Drews quart z
ond orthoclase porphyry. The contacts of the grancdiorite with
tn ODIO L SIDR ERED EAE

the older volcanics in places are sharp, but elsewhere because

of original variations in the rocks and considerable alteration

(ue mbit the rocks the granodiorite is not readily distinguishable.