110

GENERAL GEOLOGY

The ore occurrence lies in an area of plutonic rocks which according to
Dawson! extends southeast for 10 miles with a width of 2 to 3 miles. Within
this area, 8 miles to the southeast, are the analogous magnetite deposits
of the Magnet, Moose, and other claims. The country rock where unaltered
is dark grey, nearly black, of medium grain, with abundant dark-coloured
constituents which include pyroxene, biotite, and magnetite. The rock
is variable in composition and according to Daly? ranges from augite gabbro
through augite diorite to monzonite. These rocks cut Triassic strata,
but Daly states that their relation to the Tertiary volcanics is not evident
and because the plutonics in places are considerably deformed, he is inclined
to consider them as of Triassic age. Possibly, however, they are Jurassic.
In the vieinity of the Glen mine, the plutonic rock in the immediate vicinity
of the magnetite veins is, in places, altered to a rock consisting essentially
of epidote, but which is accompanied in places by what appears to be
tremolite or, in other places, serpentine.

DESCRIPTION OF ORE OCCURRENCES

So far as known the outcrops of ore are confined to an area extending
1,600 feet south from the lake shore and with a width increasing southward
from 300 feet to 1,300 feet (See Figure 20). The ore consists essentially
of magnetite with varying amounts of apatite and it occurs in vein-like
bodies that follow curving courses trending east-west along the north face
and top of a steeply rising hill which to the west suddenly ends. Outerops
of rock and ore are numerous, but not sufficiently so to permit the determ-
ination of the extent and courses of the individual veins which locally
may be seen to follow curving courses, to swell, and to subdivide. In the
following descriptions, the veins are dealt with in order from south to
north and in the order of numbers assigned them (See Figure 20).

Vein No. 1. This vein is exposed in three places over a length of
140 feet. At its eastern exposure it is 5 feet wide, but at the most western
outerop it is only 9 inches wide and appears to end. This vein may extend
some considerable distance west of its westernmost outcrop.

Vein No. 2. This vein is exposed at two places over a length of 160
feet. At its eastern outcrop the vein is 14 feet wide and seems to end
abruptly. At the west outcrop, the vein has about the same width and
possibly continues to join with No. 3.

Vein No. 3. This vein is exposed at intervals over a length of 370
feet, sends off several branches, and possibly is continued westward by
veins Nos. 4 and 5, in which case the total exposed length would be 770 feet.
At the easternmost exposure, the vein is less than an inch wide and appears
toend. At the next exposure, 70 feet west, the vein is 1 foot wide. Eighty
feet farther along the strike the vein is 5 feet wide and is only several feet
south of a body of magnetite 10 feet wide tapering to 1 foot in an easterly
direction. This larger body presumably represents the eastern end of an
enlarged part of the main vein; and from it a branch vein runs eastward

1 Dawson, G. M.: ‘‘Report on the Area of the Kamloops Map-sheet’’; Geol. Surv., Canada, Ann. Rept., vel.
VI, pt. B (1896).

2 Daly, R. A.: Guide Book No. 8, Transcontinental Excursion C 1, pt. 2, pp. 23 Issued by the Geol. Surv.,
Caanda, 191%

“A Geological Reconnaissance between Golden and Kamloops, B.C., Along the Canadian Pacifie Railway”;
Geol. Surv., Canada, Mem. 68, pp. 140-141 (1915).