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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  15-Aug-1996 by Keith J. Mountjoy (KJM)

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Name CAT FRACTION, CHUKAR FRACTION Mining Division Osoyoos
BCGS Map 082E003
Status Showing NTS Map 082E03W
Latitude 049º 00' 58'' UTM 11 (NAD 83)
Longitude 119º 29' 10'' Northing 5432225
Easting 318226
Commodities Copper, Molybdenum Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
Tectonic Belt Omineca Terrane Plutonic Rocks, Okanagan
Capsule Geology

The Cat Fraction showing is located at 366 metres elevation on the eastern slopes of Mount Kruger on the east side of the California (Lot 1907s) Reverted Crown grant, 2.25 kilometres southeast of Osoyoos, British Columbia. The Dividend-Lakeview past producer (082ESW001) lies 1.5 kilometres to the northwest.

Little information is available on the early history of the Cat Fraction claim. Previous to 1964, Sheep Creek Mines conducted an unknown amount of drilling on the Cat Fraction. In 1964, work was conducted by Noranda Exploration Co. Ltd. In 1968, Granby Mining Company Limited conducted further exploration in the vicinity. In 1986, and 1987, Markus Resources Inc. conducted extensive exploration in the Dividend-Lakeview area.

The regional geology of the Dividend-Lakeview area consists of medium to coarse-grained granodiorite of the composite Middle Jurassic Similkameen batholith. To the west this includes alkali syenite and nepheline syenite of the Kruger intrusion. The Fairview intrusion outcrops to the north. The Similkameen intrusion extends from 10 kilometres north of the Canada-United States border, south into Washington state. The granodiorite is grey-green, medium to coarse grained and dominantly composed of quartz, plagioclase and hornblende. The Similkameen batholith has intruded metasediments and metavolcanics of the Carboniferous to Permian Kobau Group. Intensely folded and metamorphosed quartzite, greenstone, phyllite, chlorite or mica schist with intercalations of dioritic rocks and sparse limestone lenses comprise lithologies. To the west lie a series of highly sheared schists, greenstones and quartzites known informally as the Kruger schists. The greenstone has been highly sheared in many areas associated with emplacement of the Similkameen intrusion and other intrusions. Shear zones strike southeast and dip moderately to steeply northeast and southwest. Local variations occur however.

The Cat Fraction showing is hosted by Osoyoos granodiorite, a satellite stock of the Similkameen batholith, near its contact with Kobau Group metasediments and metavolcanics. Minor diorite and monzonite are also present.

A drillhole (#12) was reported drilled by Sheep Creek Mines on the Cat Fraction on a weak self potential anomaly. The drillhole intersected altered diorite with minor disseminated sulphides. Visible chalcopyrite and molybdenite were intersected over 15 centimetres at 61.8 metres depth.

EMPR AR 1903-248; 1966-244; 1968-221
EMPR ASS RPT *658, 808, 1182, 2922, 8188, 9180, 14877, 16074, 21634, 22987, 23381
EMPR BULL 1 (1932), p. 88; 20 (1945, Part III), p. 18
EMPR GEM 1971-383
EMPR OF 1989-5
GSC MAP 84A; 341A; 538A; 539A; 541A; 15-1961; 1736A; 2389
GSC MEM 38, pp. 389-423; 179, p. 20
GSC OF 481; 637; 1505A; 1565; 1969
GSC P 37-21, pp. 37-40
GSC SUM RPT 1912, p. 211