British Columbia Ministry of Energy, Mines and Natural Gas and Responsible for Housing
News | The Premier Online | Ministries & Organizations | Job Opportunities | Main Index

MINFILE Home page  ARIS Home page  MINFILE Search page  Property File Search
Help Help
File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  10-Aug-1989 by Wim S. Vanderpoll (WV)

Summary Help Help

NMI 092F5 Au5
Name SHERWOOD, PATULLO 1-2 (L.1830,1844), BLACK BEAR, HAMBER, PLUTO, HART, PM Mining Division Nanaimo
BCGS Map 092F043
Status Past Producer NTS Map 092F05E
Latitude 049º 27' 52'' UTM 10 (NAD 83)
Longitude 125º 31' 22'' Northing 5482147
Easting 317209
Commodities Gold, Silver, Zinc, Lead, Copper Deposit Types I06 : Cu+/-Ag quartz veins
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

The Sherwood occurrence, located at the southern end of the Buttle Lake uplift, is underlain by cherty argillite and tuff of the Paleozoic Sicker Group. The sediments and volcanics are overlain by limestone of the Permian to Pennsylvanian Azure Lake Formation, Buttle Lake Group. A large granodiorite stock of the Jurassic Island Plutonic Suite is located approximately 2 to 4 kilometres east. See H-W (092F 330) for a discussion of the recent stratagraphic and nomenclature revisions in the uplift.

Andesite and basalt dykes in the area are related to volcanic activity that postdates the limestone. Locally, the quartz diorite dykes and stocks are related to the Early to Middle Jurassic Island Plutonic Suite. Hybrid rocks are common, and there is evidence of granitization in the area southwest of Love Lake. A regional, northwest trending fault extends from Bedwell Lake through Love Lake, and is located 0.5 kilometres east of the occurrence.

The Sherwood vein occupies a 070 to 080 degree striking shear zone that dips 65 to 72 degrees north. Strong open fractures bisect the shear zone at 090 to 120 degrees. The shear zone is up to 2.0 metres wide and contains intensely altered gouge, and lenses of quartz that range up to 0.76 metres in width. Several parallel quartz veins are present, separated by wall rock or clay gouge. Abundant, narrow quartz veins branch off the main structure.

Primary vein material consists of quartz, sphalerite, galena, covellite, chalcopyrite and pyrrhotite. Much of the vein has been reduced to rusty, crumbly and often porous material. Studies indicate the primary sulphide mineralogy is altered to malachite, marcasite, anglesite, covellite, and possibly other secondary minerals. Silver values are associated primarily with galena. The gold mineralogy is not known.

The vein has been exposed at three levels over an area of 212 metres. Samples from the Number 1 level returned assays of up to 328.50 grams per tonne gold over 24.1 centimetres and up to 462.92 grams per tonne silver over 40.6 centimetres (Bulletin 13, pages 92-93).

In 1942, 20 tonnes of ore were shipped, producing 1866 grams of gold, 3110 grams of silver, and values in lead and copper. The property was operated by Cangold Mining and Exploration Company Limited in 1946. The deposit is reported to contain 450,000 tonnes of inferred ore (Times-Colonist, December 27 1987). No grades are reported. A more conservative estimate of 25,247 tonnes of probable and possible ore, grading 17.15 grams per tonne gold is given by McDougall (1944).

EMPR AR 1941-71; 1942-28, 67; 1945-115; 1946-191
EMPR BULL 8, *13, pp. 86-95 , 20 PART V
EMPR P 1988-1, p. 81; 1987-1, p. 223
EMPR PF (Eastwood, G.E.P. (1980): Letter to E.J. Bowles, Chief Gold Commissioner, dated February 6 1980; Claim Map, 1:50,000 scale; Photograph; Gayer, R. (1944): Composite Map; McDougall, M.E., (1944): Report on the Sherwood Group of Mineral Claims)
EMR MP CORPFILE (Pioneer Gold Mines of British Columbia Limited; Cangold Mining and Exploration Company Limited; Casamiro Resource Corporation)
GSC MAP 17-1968; 1386A
GSC OF 9, 61, 463
GSC P 66-1; 68-50; 72-44; 79-30
PERS COMM: Nick Massey, May 1990 (with respect to changes in nomenclature)
Carson, D.J.T. (1968): Metallogenic Study of Vancouver Island with Emphasis on the Relationship of Plutonic Rocks and Mineral Deposits, Ph.D. Thesis, Carleton University
Juras, S.S. (1987): Geology of the Polymetallic Volcanogenic Buttle Lake Camp, with Emphasis on the Price Hillside, Central Vancouver Island, British Columbia, Canada, Ph.D. Thesis, University of British Columbia
Times Colonist Dec. 27, 1987
Yole, R.W. (1965): A Faunal Stratigraphic Study of Upper Paleozoic Rocks of Vancouver Island, British Columbia, Ph.D. Thesis, University of British Columbia