MINFILE Mineral Inventory

MINFILE Record Summary

MINFILE No 092C 026

File Created:	21-Jun-1990	by	Dorthe E. Jakobsen (DEJ)
Last Edit:	31-May-2013	by	Karl A. Flower (KAF)

SUMMARY

Summary Help


		NMI	092C16 Mn2
Name	SHERK LAKE, SHERK, STRIKER, MALJO CREEK	Mining Division	Victoria
		BCGS Map	092C099
Status	Showing	NTS Map	092C16E
Latitude	048º 55' 16''	UTM	10 (NAD 83)
Longitude	124º 12' 41''	Northing	5419393
		Easting	411257
Commodities	Rhodonite, Gemstones, Manganese	Deposit Types	Q02 : Rhodonite Q05 : Jasper
Tectonic Belt	Insular	Terrane	Wrangell

Capsule Geology

The Sherk Lake showing is located about 805 metres south of Sherk Lake, which is 5.5 kilometres north of Cowichan Lake.

The area is underlain by Upper Devonian McLaughlin Ridge Formation (Sicker Group) mafic volcanics and Mississippian to Pennsylvannian Fourth Lake Formation (Buttle Lake Group) ribbon cherts and crinoidal limestone. A major anticline occurs to the east and the area is highly faulted.

Rhodonite, rhodochrosite and jasper occur in cherts and cherty tuffs of the Fourth Lake Formation in the Lower Mississippian Shaw Creek Member (dated by conodonts, Personal Communication - Nick Massey, 1991). Rhodonite development is restricted to dark ribbon chert and it may be cut by major faults. Pyrite and pyrrhotite also occur in the area hosted by felsic tuffs.

A cherty tuff bed contains a jasper horizon which hosts irregular, lenticular masses of rhodonite and rhodochrosite. The jasper horizon has been traced along strike for more than 305 metres and is up to 1 metre wide. The largest lens is several centimetres wide and 30 to 61 centimetres long.

In 1981, New Gold Inc. completed a program of geological mapping and prospecting in the area as the Sherk and Widow claims. From 1985 through 1989, BHP-Utah Mines completed programs of geochemical sampling, geological mapping and ground and airborne geophysical surveys in the area as the Striker Property. The rhodonite and jasper have been analyzed for sulphide content and the assays were low in gold, silver, copper, and molybdenum (Assessment Report 16210).

In 2008, Cuda Capital Corp. completed a program of helicopter-borne magnetic and VTEM surveys on the area as apart of the El Capitan Property. From 2008 through 2010, S. Phillips completed programs of prospecting and geochemical sampling on the area as the Red Head Jerry claim.

Bibliography

EMPR ASS RPT 13962, 14302, 15117, *16210, 30172, 30172, 30440, 31211, 32324

EMPR BULL 37, pp. 65-67; *69

EMPR FIELDWORK 1978, pp. 38-40; 1986, pp. 223-229; 1987, pp. 81-91;

1988, pp. 61-74; 1989, pp. 503-510

EMPR MP MAP 1992-2

EMPR OF *1987-2; 1988-24; RGS 24, 1990

EMPR PF (In General File: B.C. Forest Products Road Map, Cowichan

Lake Area, 1963; In Commodity File - Sargent, H. (1956): Manganese

occurrences in B.C. and Leaming, S.F. (1966): Rhodonite in B.C. in

The Canadian Rockhound and Danner, W. R. (1976) Gem Materials of

B.C.)

GSC MAP 17-1968; 49-1963; 1386A

GSC MEM 13

GSC OF 463; 821; 1272

GSC P 72-44; 72-53; 76-1A; 79-30

Carson, D.J.T. (1968): Metallogenic study of Vancouver Island with

emphasis on the relationships of mineral deposits to plutonic

rocks, Ph.D. Thesis, Carleton University

Cowley, P. (1979) Correlation of Rhodonite Deposits on Vancouver

Island and Saltspring Island, British Columbia, Unpublished B.Sc.

Thesis, University of British Columbia

Hudson, R. (1997): A Field Guide to Gold, Gemstone & Mineral Sites of

British Columbia, Vol. 1: Vancouver Island, p. 105

Sargent, H. (1939): Manganese Deposits of Cowichan Lake

Munition Resources Commission of Canada, 1920 p.92