16

The deposits at Whitehorse and those already described as occurring
respectively near Nordenskiéld river and Giltana lake are essentially of
the same general character. They are contact-metamorphic, replacement
deposits which have developed mainly in strata near or at the edge of
invading bodies of granitic rocks. The three localities occur within a
distance of 75 miles and lie 7 to 20 miles northeast of the east edge of the
batholithic area of the Coast Range intrusives with which, in all probability,
are connected the outlying bodies of granitic rocks that gave rise to the
ore deposits. Presumably other iron ore-bodies occur in the territory
adjacent to the edge of the main body of Coast Range intrusives which
extends northwest past Giltana lake for a distance of 50 to 75 miles or
more. These deposits are counterparts of the magnetite bodies which
occur west of the Coast Range batholith along the Pacific coast of British
Columbia and like them are irregular in form and variable in composition,
but locally contain many thousands of tons of magnetite iron ore with a
comparatively low sulphur and insignificant copper content.

BRITISH COLUMBIA
OMINECA MINING DIVISION

(1) Summit Creek, Zymoetz River
Source of Information. MacKenzie, J. D.: Geol. Surv., Canada, Sum. Rept. 1915, pp. 67-69.
GENERAL DESCRIPTION

The following account of this limonite deposit is derived from the
report by Mackenzie, which is accompanied by a geological plan of the
ore occurrence. The property has also been described by W. M. Brewer.!

“The beg iron ore yroperty owned by the North Pacific Iron Mines,
Limited, of Prince Rupert, is situated on Limonite (Summit) creek, a
tributary of the Zymoetz (Copper) river, 38 miles east of Copper city on
the Skeena. It is 6 miles west of the summit of the Zymoetz River-
Telkwa River trail, and about 40 miles from Telkwa. The property con-
sists of nine claims on the north side of the creek, covering approximately
375 acres.”

“The largest of the deposits on the property . . . was exam-
ined . . . . but (it is reported) that other, smaller, similar deposits
occur at higher elevations . . . . farther back from the creck.

The deposit examined, which consists of a sheet of bog iron ore of unknown
thickness, extending from the ‘moss roots’ to bedrock, lies on the steep
north side of Limonite Creek valley. It extends from the stream

for . . .-. 1,800 feet in a straight line up the mountain side :
from an elevation of 2,600 feet . . . . t03,500feet . . . . The
irregular area underlain by limonite measures about 2,250,000 square feet,
and its greatest width is about 1,800 feet. Everywhere in this area,
yellow or brown earthy limonite may be uncovered merely by removing
the moss from the surface; there is no overburden except the trees and
1 OSS ee ue

“The deposit consists of bedded bog iron ore . . . . in platy
layers from 1 to 3 inches thick, lying parallel to the hill-side, which here

1 Brewer, W. M.: Rept. of Minister of Mines, B.C., 1914, pp. 123-124.