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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  21-May-1996 by Keith J. Mountjoy (KJM)

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NMI 082E3 Cr2
Name ROCK CREEK, D.W.S., D.W.S. GROUP, HULME CREEK GROUP, SAMMY GROUP, TOBRUCH, CR 1-6, BELCHROME 1-8, YELLOW OCHER, RED OCHER, GREEN OCHER, HUL Mining Division Greenwood
BCGS Map 082E005
Status Prospect NTS Map 082E03E
Latitude 049º 04' 58'' UTM 11 (NAD 83)
Longitude 119º 00' 36'' Northing 5438604
Easting 353232
Commodities Chromium, Nickel Deposit Types M03 : Podiform chromite
Tectonic Belt Intermontane Terrane Okanagan
Capsule Geology

The Rock Creek chromite prospect is located 4.5 kilometres north of the village of Rock Creek and 500 metres west of Highway 33 and the Kettle River. The showings are on the lower slopes of a small hill at about 914 metres elevation.

The first recorded work on the Rock Creek chromite prospect occurred during World War I. S. Godwin developed a small opencut and a shallow shaft and had stockpiled a small amount of sorted ore for shipment. The Rock Creek showings were originally staked as the Yellow Ocher, Red Ocher and Green Ocher claims. These were later restaked by L. Mader as the Hulme Creek showing. Subsequent work consisted of a number of opencuts and a 7.6-metre shaft, prior to World War II. In 1942, the showings were staked as the Tobruch claim by J.O. Howells. Geological mapping and trenching were conducted. The property was restaked by B. Fenwick-Wilson in 1955, who conducted bulldozer trenching and about 123 metres of diamond drilling in three holes. In 1958, the Belair Mining Corp. Ltd. staked the Belchrome Nos. 1-8 claims which were also referred to as the Sammy prospect. These claims were later allowed to lapse and in 1980, D.W.S. Davies staked the D.W.S. claims. From 1980 to 1987, the property has been extensively prospected for chromium, nickel, platinum, gold and silver with marginal results (see table below). No work has been recorded since 1987 and the claims lapsed in December, 1989.

The oldest rocks in vicinity of the Rock Creek chromite occurrence belong to the Carboniferous to Permian Kobau and Anarchist groups. Amphibolite, greenstone, quartzite, chert, chlorite schist and minor marble comprise the Kobau Group and amphibolite, greenstone, quartz chlorite schist, quartz biotite schist and minor serpentinized peridotite comprise lithologies of the Anarchist Group. Penticton Group lithologies outcrop to the east while Middle Jurassic porphyritic granite, granodiorite and monzonite intrusions are found to the immediate north. Smaller plugs, dikes and sills of biotite granodiorite, quartz diorite and granite of Middle Jurassic to Cretaceous age intrude the Anarchist Group rocks. Small serpentinite intrusions of uncertain age occur throughout the area and comprise the hostrock of the Rock Creek chromite occurrence.

The chromite is hosted in a 50 by 500 metre serpentinized peridotite body of uncertain age. The body is fault bounded by metavolcanic rocks of the Anarchist Group. The serpentinite is massive and fractured with talc coating the fracture surfaces.

Chromite occurs as stringers of disseminated grains and some nodules up to 20 centimetres in diameter. Trenching and diamond drilling indicate a broad zone of intermittent low-grade mineralization 10 metres wide with a higher grade stringer 2.25 metres across. The strike length has not been defined. A 3-metre chip sample across a stringer zone yielded 8.87 per cent Cr2O3 and a sample of a nodule graded 27.8 per cent Cr2O3 (Minister of Mines Annual Report, 1958). Sampling of old dump material by Stevenson (1941) yielded best assays of 41.6 per cent and 46.6 per cent Cr2O3.

Rock and soil sampling by D.W.S. Davies between 1980 and 1987 yielded the following results:

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Rock:

Report # of Cr Ni Ag Pt

Year samples Range or Average Value

1981 3 - 0.20 % 1.37 gm/t -

1983 12 710 - - -

715 ppm

1985 7 <30 ppm <50 ppm - -

1986 14 110 ppm - - <35 ppb

1987 16 2 - - dl

293 ppm

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Soil: 1981 4 - <10 ppb - 1983 210 <50 ppm <25 ppm - - 1985 21 40 - - -

974 ppm 1986 21 - - dl - 1987 5 8 - - -

184 ppm

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Codes: ppm - parts per million

dl - detection limit or below

"-" - not analysed

Values are summarized from Assessment Reports: 9737, 10913,

12381, 14333, 15027 and 16883.

Bibliography
EMPR AR 1928-251; *1958-34
EMPR ASS RPT 8791, *9737, *10913, *12381, *14333, *15027, *16883
EMPR BULL (*Stevenson, J.S. (1941): unpublished Bulletin)
EMPR EXPL 1980, p. 25; 1981, p. 105; 1982, p. 28
EMPR OF 1990-27
GSC EC GEOL 13, p. 98
GSC MAP 538A; 539A; 15-1961; 1505A; 1736A
GSC OF 481; 1969
GSC P 37-21, pp. 7,43; 72-53, p. 80; 89-1E
CANMET IR 1399 (May 1943)

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