Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52E09SE00003

Record: MDI52E09SE00003

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper, Silver

Location

Township or Area: Manross

Latitude: 49° 35' 58.06"    Longitude: -94° 14' 12.24"

UTM Zone: 15    Easting: 410633.878   Northing: 5494832.946    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52E09SE

Point Location Description: Precise

Location Method: Conversion from MDI

Geology Comments

Feb 15, 2011 (C Ravnaas) - The Wendigo Mine site is primarily underlain by porphyritic and aphyric basalts, which have been intruded by gabbro and peridotite sills. Both massive and pillowed varieties of aphyric basalts underlie the property. The basalt is mainly fine-grained, and some of the medium-grained basalt present may represent subvolcanic intrusions. Composition varies from tholeiite to high-iron tholeiite. The porphyritic basalt overlies the massive basalt. Pillows of porphyritic basalt observed near the shaft face north. Much of the property is underlain by gabbro and peridotite, which are interpreted to be thick, differentiated sills. Fine-grained peridotite, which commonly overlies the porphyritic basalt, forms the stratigraphic base. Reference: Davies, J.C. and Smith, P.M. 1988. The Geological Setting of Gold Occurrences in the Lake of the Woods area; Ontario Geological Survey, Open File Report 5695, 381p. - Wendigo P 353-361

Lithology

Lithology Comments

Feb 15, 2011 (C Ravnaas) - Gold mineralization seems to be restricted to zones of silicification, notably 4, east-trending, steeply northdipping veins. All the veins were explored while the mine was in operation, but production was restricted to the No. l Vein. In general, the attitude of the veins is close to that of the enclosing lava flows. They occur in both the porphyritic and aphyric basalt, much of which has been altered to chlorite schist. The south (ore proximal) side of a parallel peridotite sill has been altered to a soft "talcose" rock. Reference: Davies, J.C. and Smith, P.M. 1988. The Geological Setting of Gold Occurrences in the Lake of the Woods area; Ontario Geological Survey, Open File Report 5695, 381p. - Wendigo P 353-361

Mineralization

Mineralization Comments

Feb 15, 2011 (C Ravnaas) - The No. l or Main Vein reportedly contained the following values: 0.24 oz Au across 24 in for 212 ft; 0.46 oz Au across 21 in for 303 ft; 0.60 oz Au across 30 in for 128 ft, and 0.40 oz Au across 30 in for 388 ft (Thomson 1935, p. 38). Chemical analyses of samples of weakly altered and less deformed basalt (including the porphyritic basalt), taken some distance from the mineralized horizons during this study, indicated background gold values ranging from ^ to 7 ppb. All lithologies within the gabbro sill contained ^ to 2 ppb Au. A sample of milky-white quartz with no visible sulphides, taken from the southeastern corner of the peninsula on the western side of Gangue Lake, assayed 1560 ppb Au. The quartz is hosted by strongly, sheared gabbro. This location is close to the axial trace of the syncline which trends east through Gagne Lake. In the years 1900, 1936 to 1943, and 1951 to 1967, 67,423 ounces of gold, 14,762 ounces of silver, and 1,886,246 pounds of copper were produced from 206,054 tons of ore milled. The average grade of ore milled was 0.33 oz Au/ton. Reference: Davies, J.C. and Smith, P.M. 1988. The Geological Setting of Gold Occurrences in the Lake of the Woods area; Ontario Geological Survey, Open File Report 5695, 381p. - Wendigo P 353-361

Mineral Record Details

References

Part - Mines of northwest Ontario, parts 1 and 2

Publication Number: ARV10.004 Page: 71-72  Date: 1998

Author: Bow J.A., Carter W.E.H.

Publisher Name: Ontario Bureau of Mines

Location:

Part - Gold deposits on the Lake of the Woods

Publication Number: ARV44-04.002 Page: 34-39  Date: 1997

Author: Thomson J.E.

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: 154-155  Date: 1971

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

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

Mono - Gold deposits of the Kenora-Fort Frances area, districts of Kenora and Rainy River

Publication Number: MDC016 Page: 43  Date: 1976

Author: Beard R.C., Garratt G.L.

Publisher Name: Ontario Division of Mines

Location:

Compend - Report of activities, Regional and Resident Geologists, 1982

Publication Number: MP107 Page: 3,12  Date: 1983

Author: Kustra C.R.

Publisher Name: Ontario Geological Survey

Location:

Mono - The geological setting of gold occurrences in the Lake of the Woods area

Publication Number: OFR5695 Page: 353-361  Date: 1988

Author: Davies J.C., Smith P.M.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Kenora Resident Geologist District Office