Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E12NW00018

Record: MDI42E12NW00018

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Summers

Latitude: 49° 39' 16.41"    Longitude: -87° 58' 5.55"

UTM Zone: 16    Easting: 430116   Northing: 5500674    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12NW

Point Location Description: Main stripped area

Location Method: Conversion from MDI

Access Description: Access to the Minnow Lake claim group is via Highway 580 north from Highway 11 to the 72 Road. The main stripped zone can be reached by travelling a further 5 km north on the 72 Road to a small bush road and proceeding east for 500 m.

Exploration History

1935-1989: Early exploration in the Lafontaine–Minnow Lake claim group vicinity occurred in 1935. Various prospecting syndicates, including the Calhet Exploration and Jake–Stur syndicates, individual prospectors and several companies conducted field programs on more than a dozen properties surrounding the Lafontaine–Minnow Lake property until 1989. Stripping, trenching, sampling and diamond drilling were conducted. 1952: Candela Development Company drilled 1 DDH totalling 96.8 m. 1988: Beardmore Reseources carried out an IP survey. 1991-92: Freewest Resources Inc. conducted stripping and sampling. 1999: A. Lafontaine and S. Lafontaine carried out beep mat surveys, prospecting, stripping, and sampling. 2007-8: Kodiak Explorations Ltd. carried out prospecting, sampling, and mapping. 2010: A. Lafontaine carried out prospecting and trenching.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Nov 27, 2018 (Robert Cundari) - The Lafontaine-Minnow Lake property is located along the southern margin and within the western portion of the main, east-trending, Beardmore-Geraldton greenstone belt. This margin represents the southern boundary of the eastern Marmion domain–Wabigoon Subprovince. The Lafontaine–Minnow Lake claim lies in the central metavolcanic sub-belt (Devaney and Williams 1989).

Lithology

Lithology Comments

Nov 27, 2018 (Robert Cundari) - Hart, ter Meer and Jolette (2002) described the geology of this belt in the Beardmore area as consisting of intermediate massive and pillowed flows with significant tuffs, lapilli tuffs and tuff breccias, and minor interflow chert and magnetite banded iron formation. Mapping and geophysical interpretation by Hart, ter Meer and Jolette (2002) indicated the presence of several parallel banded iron formation units (including the main stripped zone on the Lafontaine–Minnow Lake claim) that continue to the west of the property.

Mineralization

Mineralization Comments

Nov 27, 2018 (Robert Cundari) - The main stripped zone (UTM 430116E 5500674N, Zone 16) on the Lafontaine–Minnow Lake occurrence, as observed by staff of the Thunder Bay North Resident Geologist office during a September 2011 visit, is a heavily gossaned, sulphide-rich (mainly pyrite, pyrrhotite and minor chalcopyrite) chert-magnetite banded iron formation approximately 30 to 35 m wide. Previous cross-stripping to the east indicates that this zone can be traced for over 420 m along a northeasterly trend (ranging from 075 to 080°). Discontinuous seams and patches of mainly pyrite up to 3 cm in width were noted at various locations within the iron formation across the zone. This sulphidized iron formation appears to be enclosed within a larger, 150 to 160 m wide, deformation zone. This is most evident along the southern contact of the iron formation with the host mafic metavolcanic rocks. Here, well-developed pillowed and amygdaloidal flows have been flattened and strongly sheared along the northeasterly trend. Samples collected by Resident Geologist Program staff from locations along the sulphidized portion of the iron formation returned assay results as high as 28 g/t Au (White et al., 2012). A grab sample collected from a banded quartz vein containing 2 to 3% disseminated pyrite and chalcopyrite assayed 0.107 ounces of gold per ton (Assessment file 42E12SW0046/).

Mineral Record Details

References

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

Publication Number: MDC013 Scale:     Date: 1971

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

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

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

Publication Number: ARV45-02.002 Scale:     Date: 1998

Author: Laird H.C.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Report of Activities 2011, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North District

Publication Number: OFR6272 Scale:     Date: 2012

Author: White G.D., Smyk M.C., Cooke A., Lockwood H.C., Wilson A.C.

Publisher Name: Ontario Geological Survey

Location:

Mono - Report of Activities 2002, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North District

Publication Number: OFR6111 Scale:     Date: 2003

Author: Mason J.K., White G.D., O'Brien M.S., Komar C.L.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Precambrian Geology of Kitto, Eva, Summers, Dorothea and Sandra Townships, Northwestern Ontario: Phoenix Bedrock Mapping Project

Publication Number: OFR6095 Scale:     Date: 2002

Author: Hart T.R., ter Meer M., Jolette C.

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