116

The claims lie at an altitude of about 2,500 feet above sea-level or
1,400 feet above Kamloops lake and within an unforested tract stretching
sastward for several miles from the valley of Cherry creek. This open
country side is, in general, smoothly rolling with considerable areas devoid
of rock exposures. Within the area of the claims, bedrock is largely
concealed by drift and natural outcrops of ore seem to have been few and
of limited size, but the claim owners have done considerable stripping and
trenching and therel »y have uncovered a number of mineralized occur-
rences. In addition to such work, several shallow trenches and an incline
pit have been sunk on ore outcrops on the Moose claim and from these,
some time ago, several hundred tons of ore were extracted and shipped.
On the Magnet claim a shaft was sunk years ago in search of copper ore,
but only magnetite was found. Both to the east and west of the claims,
locations for copper ore have been made and one of these has been an

active producer.

GENERAL GEOLOGY

The ore occurrences lie in the northern part of an area of plutonic
rocks, which according to Dawson! commences at the Kamloops-Cherry
Creek road and extends southeast for 10 miles with a width of 2 or 3 miles.
A considerable portion of the northwestern part of this area is stated by
Dawson to be occupied by “gabbros and dark diorites’” similar to the
rocks forming Cherry bluff on Kamloops lake, and which Dawson supposed
to be of Tertiary age and perhaps to represent part of the voleanic vent
through which the ‘neighbouring Tertiary volcanic materials reached the
surface. The area of these rocks bordering Kamloops lake has been
restudied by Daly? who states that the plutonic rocks in question undoubt-
edly cut Triassic strata of the Nicola series, but that their relation to the
Tertiary series is not so obvious. Because the plutonics are locally greatly
sheared and much altered and whereas this is a condition rarely found to
affect the Tertiary strata, Daly suggests that the plutonies are, ‘Triassic,
representing a late phase in the eruptivity of that period. On this view
the shearing of the intrusive and the deformation of the Tertiary rocks
would be explained” by an early Tertiary movement. If the plutonic
rocks are not of Tertiary age, it is not apparent why they should be classed
as Triassic rather than late Jurassic, since in British Columbia the late
Jurassic was a period of widely spread plutonic invasion.

The rocks of Cherry bluff are described by Daly as forming a hetero-
geneous mass varying from augite gabbro through augite diorite to mon-
zonite. The rocks found on the mineral claims appear to be of the same
types, are generally medium to fine-grained, and of a dark greenish or when
fresh, ions grey shade. The rocks are feldspathic, many of the feldspars
showing sharp crystal boundaries; the dark coloured constituents include
pyroxene, biotite, and magnetite varying in relative proportions from
place to place. In some phases the biotite forms large flakes filled with
inclusions of the other rock constituents. The rocks are much fractured
and weathered. Many have a pink tinge perhaps due to weathering and
in places the pink tinge is very pronounced.

1 Dawson, G. M.: ‘‘Report on the Ares of the Ke umloops Map-sheet’’; Geol. Surv., Canada, Ann. Rept., vol
VIT, pt. B (1896). eee anying map, Ko »mloops sheet, 1895. = ‘
é 2 Dal R.A.: Guide Book No. 8, Transcontinental Excursion C 1, pt. 2, pp. 232-233; Issued by the Geol. Surv.

vanada, 1913 id

“A Geolc il Reconnzissance between Golden and Kamloops, B.C., Along the Canadian Pacific Railway”

Geol. Surv., Canada, Mem. 68, pp. 140-141 (1915). id OEE ES,