Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52B13SE00022

Record: MDI52B13SE00022

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper, Silver, Lead

Location

Township or Area: Freeborn

Latitude: 48° 50' 13.6"    Longitude: -91° 39' 25.5"

UTM Zone: 15    Easting: 598543   Northing: 5410218.01    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52B13SE

Point Location Description: AMIS shaft location

Location Method: Data Compilation

Access Description: Access is available via the Steep Rock Iron Mine Limited Road, or an access road off the Clearwater West Lake Road.

Exploration History

1898: Vein discovered on claim FF2361. Shaft was sunk to 45 feet (13.7 m). 1938: Property owned by Rebair Gold Mines Limited. 1940-48: Rebair Gold Mines drilled 22 DDH. Minor trenching performed. 1939: Steep Rock Iron Mines Limited conducted work. 1940: Property owned by M. Scheider of Thunder Bay. Sampled by Sylvanite Gold Mines Limited. 1941: Sylvanite Gold Mines Limited wrote a report, D. K. Burke. 1949: Trenching, sampling and report by Steep Rock Iron Mines Limited. 1960: Report by F. G. Harriman, written for Steep Rock Mines Limited. 1961: Steep Rock Mines drilled 2 DDH. 1979-80: Property visited by Atikokan Gold Study. 2004: Aavdex Corp. conducted ground magnetic and horizontal loop EM surveys and drilled 2 DDH. 2009: TerraX carried out prospecting and sampling. 2010-11: TerraX conducted ground geophysical surveys, mapping, and drilled 12 DDH totalling 2177.25 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Finlayson Lake

Geological Age: Archean  

Lithology

Lithology Comments

Feb 21, 2019 (Therese Pettigrew) - The general geology of the area immediately adjacent to the veins consists of a granite with a few tongues and bands of greenstone still remaining in it. The greenstone increases to the west where, within a few hundred yards lies the approximate greenstone-granite contact. The south vein lies mostly in the granite and where in the greenstone is narrow or lacking (Fenwick, 1976).

Mineralization

Mineralization Comments

Feb 21, 2019 (Therese Pettigrew) - There are 6 quartz and quartz-carbonate veins hosted within a NE-striking shear zone (Schnieders and Dutka, 1985). The south vein lies mostly in the granite and where the greenstone is narrow or lacking. It is mineralized throughout with pyrite, some chalcopyrite and possibly a little fine galena. The north vein is the longest vein on the property. This vein is joined by the south vein before it crosses the north boundary of the claim. Sampling on the south vein showed that mineralization was controlled by a fracture system. The south vein averages 0.3 m in width, strikes N30E, and dips 85 degrees east, with an assumed strike length of 300 m. Along its developed length north and south of the shaft, it is found to occur largely in granite porphyry. The quartz is milky white in colour and carries sparse mineralization. The southern shoot averages 11.9 g/t Au over 0.33 m (thickness) over a strike of 21.6 m and the northern shoot averages 13.44 g/t Au over 0.27 m over 32 m strike length (Fenwick, 1976). The Ontario Geological Survey has examined the Black Fly main vein on several occasions. MacRae (1978) collected samples with values of up to 7.9 g/t Au at the Black Fly shaft. Wilkinson (1982) reported a value of 11.00 g/t Au in a chip sample across a quartz-ankerite vein with trace pyrite and arsenopyrite. Sampling by Schnieders and Dutka (1985) produced values of 8.75 g/t Au over 0.35 m in a quartz vein and 3.44 g/t Au in wallrock. They noted that mineralization consists of pyrite, galena, and arsenopyrite with accessory chlorite, sericite, ankerite and epidote, and that the main vein can be traced for 290 m. Rebair’s DDH 18 assayed up to 6.8 g/t Au. In 1949 Steep Rock Iron Mines examined the main mineralized veins on the Black Fly property, concentrating on the main vein. A map of the southerly vein reports up to 31.59 g/t Au over 0.33 m and up to 48.1 g/t Au from rock taken from the shaft at the 30’ level. They also excavated nine trenches/pits along the strike of the vein southwest of the shaft, producing values as high as 27.81 g/t Au over 0.86 m. TerraX intersected 0.51 m at 2.22 g/t Au in DDH BF10-03, and 1.07 m at 15.1 g/t Au in DDH BF10-04 (Assessment file 20000008907).

Mineral Record Details

References

Map - Finlayson Lake, Rainy River District

Publication Number: M2297 Scale: 1:31,680    Date: 1976

Author: Fenwick K.G.

Publisher Name: Ontario Division of Mines

Location:

MonoMap - Geology of the Finlayson Lake area, District of Rainy River

Publication Number: R145 Scale:     Date: 1976

Author: Fenwick K.G.

Publisher Name: Ontario Division of Mines

Location:

Mono - Gold deposits of the Atikokan area

Publication Number: MDC024 Scale:     Date: 1982

Author: Wilkinson S.

Publisher Name: Ontario Geological Survey

Location:

Mono - Property visits and reports of the Atikokan economic geologist, 1979-1983, Atikokan geological survey

Publication Number: OFR5539 Scale:     Date: 1985

Author: Schnieders B.R., Dutka R.J.

Publisher Name: Ontario Geological Survey

Location:

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:

Article - Mineral deposits of the Atikokan area

Publication Number: MP082.046 Scale:     Date: 1997

Author: MacRae W.

Publisher Name: Ontario Geological Survey

Location:

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