Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42C02SE00011

Record: MDI42C02SE00011

General

Commodities

Primary Commodities: Gold, Silver

Location

Township or Area: Corbiere

Latitude: 48° 6' 33.14"    Longitude: -84° 35' 2.7"

UTM Zone: 16    Easting: 679830.26   Northing: 5331261.25    UTM Datum: NAD83

Resident Geologist District: Sault Ste. Marie

NTS Grid: 42C02SE

Point Location Description: Old open cut on north side of Pokorney Lake

Location Method: Conversion from MDI

Access Description: The property is accessible by driving north, through the community of Hawk Junction for a distance of approximately 1.5 km past the village limits. From there the property can be accessed either by traversing the railway tracks for a distance of approximately 4 km or by a bush traverse for a distance of approximately 3 km. The occurrence is located on the north side of Pokorney Lake.

Exploration History

The occurrence was discovered by John Holdsworth in 1933. Prospected for gold by Holdsworth in 19333-34. Property taken over by Soocana Mining Company Limited in 1933. Six diamond drill holes completed in 1933, 5-ton test mill set up, open cut made in more promising section of the vein. A sixty-ton bulk sample was extracted from the vein. The property by sampled by a succession of companies from 1935-1940. They included Falconbridge Nickle Company Limited,Erie Canadian Mines Limited, Compass Gold Mines Limited and Sylvanite Gold Mines Limited. In 1982 the property was optioned by Falconbridge and they completed an airborne geophysical survey over the property in 1983. The company also completed ground geophysical surveys, geological mapping and drilled 3 diamond drill holes (295 m).

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Michipicoten

Tectonic Assemblage: Wawa

Geological Age: Neoarchean   Geochronological Age: 2750 MA   Geochron. Age Ref.: OFR 5888

Geology Comments

Dec 07, 2005 (A Wilson) - The quartz vein is hosted by mafic metavolcanic rocks of the Wawa Assemblage. In the vicinity of the occurrence the mafic metavolcanics have been sheared to a chloritic schist. The vein contact is locally hosted by sericitic schist. The vein occupies a ductile shear zone which may display monor left lateral offset across a NW-grending transverse fault. This fault zone is now occupied by a diabase dike. Drag along this fault may account for the thickening of the vein. The vein appears to occur at the contact between mafic and intermediate metavolcanics.

Lithology

Lithology Comments

Dec 07, 2005 (A Wilson) - The vein consists of milky quartz with minor carbonate and sulphide mineralization. Near the old mill site where the open cut was constructed, disseminated pyrite and chalcopyrite are present in the vein. The host rock is a mafic intrusion that has been locally sheared to a chlorite schist. Chlorite clots up to 1.5 mm in some areas may be former mafic phenocrysts now completely altered to chlorite. The vein width varies from location to location, and the vein is reported to be traceable for 213 m.

Mineralization

Mineralization Comments

Dec 07, 2005 (A Wilson) - Gold values are extremely erratic within the vein, however, the best gold values are reported to occur in association with chalcopyrite. Pyrite mineralization is not an apparent indicator for gold. Grab samples by the Ontario Geological Survey from the occurrence range from trace Au to 0.55 oz/t Au from a milky quartz vein with traces of cp and py to 3.28 oz/t Au from a milky quartz vein with 1% cp and visible gold. Gold values have been described as erratic, but interesting.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Vein

References

Map - Michipicoten area, compilation sheet, District of Algoma

Publication Number: P0184 Scale: 1:126,720    Date: 1997

Author: Goodwin A.M.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Geological series, Precambrian geology, Corbiere Township, Algoma District

Publication Number: P2607 Scale: 1:15,840    Date: 1984

Author: Sage R.P., Calvert T., Epstein R., England D., Koscinsko K., Worona R., Oudkerk G., Inasi J., Lockwood M.B., Thomas D.

Publisher Name: Ontario Geological Survey

Location:

Folio - Corbiere Township, District of Algoma

Publication Number: GDIF297 Date: 1997

Author: Sault Ste Marie RGO

Publisher Name: Ontario Geological Survey

Location:

Part - The Michipicoten-Missinaibi area

Publication Number: ARV44-08.001 Page: 17-18  Date: 1997

Author: Burwash E.M.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay

Publication Number: MDC013 Page: 23  Date: 1971

Author: Ferguson S.A., Groen H.A., Haynes R.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

Mono - Wawa mineral deposits data base

Publication Number: OFR5775 Page: 46  Date: 1991

Author: Frey E.D., Stewart R.C.

Publisher Name: Ontario Geological Survey

Location:

Book - ROBINSON,D.,1983,UNPUB RPT P25 WRGO

Publication Number: N/A Date: 1996

Author:

Publisher Name:

Location:

MonoMap - Geology of Abotossaway, Corbiere, Leclaire and Musquash Townships and Part of Dunphy Township, District of Algoma

Publication Number: OFR5587 Page: 281-284  Date: 1993

Author: Sage R.P.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Sault Ste. Marie Resident Geologist District Office