Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E12SW00008

Record: MDI42E12SW00008

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Summers

Latitude: 49° 37' 32.11"    Longitude: -87° 59' 25.63"

UTM Zone: 16    Easting: 428468   Northing: 5497474    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12SW, 52H09SE

Point Location Description: Plugger hole locations from map in Assessment report 42E12NW0123

Location Method: Data Compilation

Exploration History

1910: Claims were staked by H. Murphy and P.J. McDevitt adjoining the Leitch property to the north. 1934: A second group of claims was staked by G. Maki, L. Farrow, and J. Farrow. 1936: Drilling, blasting, trenching and sampling was performed on several of the claims by H.G. Waring and the Long Lac Superior Syndicate. 1944-1979: Various claims were staked, leased, cancelled, restaked etc. 1982-84: A group of 22 claims were staked by J. McMahon, M. Rentz, and W. Cox, including the old Murphy showings, south of the Leitch property. Geological mapping, trenching, and sampling was conducted over a flagged grid. 1988: Nipigon Gold Resources Ltd. drilled 3 DDH and conducted airborne magnetometer and EM surveys as well as stripping, trenching, mapping, and sampling. 1993: B. Kowalski carried out prospecting, samples from plugger holes, mapping, and a VLF-EM survey. 2008: Kodiak Exploration Ltd. carried out prospecting and sampling. 2012-13: R. Cote carried out prospecting, mapping, trenching, and sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Lithology

Lithology Comments

Oct 15, 2019 (Therese Pettigrew) - The showing area is hosted by greywackes that are fine-grained sugary in texture and are massive. The general strike and dip of the greywackes was determined to be 090/80S. A number of narrow quartz veinlets and stringers occur in the unit. The greywackes appear sheared toward the contact with the iron formations. In the massive sequence of greywackes are iron formations. The iron formations are oxide facies and contain up to 15% sulphides. Sugary and glassy quartz veinlets cross-cut the iron formations. The iron formations strike 090 however were determined to be overturned in the sequence 85N (Assessment report 42E12NW0123).

Mineralization

Mineralization Comments

Nov 04, 2019 (Therese Pettigrew) - In 1936, Long Lac Superior Syndicate uncovered a few quartz veins near the east boundary of claim 19913. No assays were reported (Laird, 1937). The best sample collected by Nipigon Gold in 1982 returned 0.01 oz/t Au (0.34 g/t Au) from a greyish-white quartz vein along and iron formation and greywacke (Assessment report 42E12SW0040). A number of large stripped areas expose folded and locally sulphidized banded iron formation. Grab samples of sulphidized (=20% fine-grained pyrite) magnetite banded iron formation with minor quartz veinlets returned up to 0.02 ounce Au per ton (Resident Geologist’s Files, Thunder Bay North District, Thunder Bay; Smyk et al., 2007). Seventy-six dust samples were collected carefully into bags from the plugger holes. The depth of the plugger holes was 1.5 feet. These samples were taken along the iron formation, particularly where sulphides were apparent. Dust taken from plugger holes in magnetite-hematite-jasper iron formation. Sugary to glassy quartz veinlets cross-cut the iron formation. The veins are 2 to 5 inches in width. The iron formation contains sulphides of pyrite, pyrrhotite, chalcopyrite, bornite, minor arsenopyrite and galena as fine disseminations 1 mm in diameter and massive veinlets. The sulphides occur in varying amounts from 1 to 15% concentrations. The results from the program revealed that gold occurs along the drag folds or in the noses of the folds of the iron formation. Samples 32, 34, 54, and 66 from the 1993 plugger hole program returned assays of 4.368 ppm Au, 2.46 ppm Au, 1.671 ppm Au, and 4.858 ppm Au respectively (Assessment report 42E12NW0123).

Mineral Record Details

References

Map - Summers Township, District of Thunder Bay

Publication Number: P0602 Scale: 1:15,840    Date: 1998

Author: Mackasey W.O.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Report of Activities 2006, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North District

Publication Number: OFR6201 Page: 20-21  Date: 2007

Author: Smyk M.C., White G.D., Puumala M.A., Magee M.A., Komar C.L.

Publisher Name: Ontario Geological Survey

Location:

Part - The western part of the Sturgeon River area (Sturgeon R.-Beardmore section)

Publication Number: ARV45-02.002 Page: 105-106  Date: 1998

Author: Laird H.C.

Publisher Name: Ontario Dept. of Mines

Location:

File - Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date: 1996

Author:

Publisher Name:

Location: Thunder Bay RGP

Book - GDIF 42E12NW (unpublished)

Publication Number: GDIF Date: 1988

Author: Ontario Geological Survey

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office