Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E12NW00008

Record: MDI42E12NW00008

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper, Zinc, Silver, Lead

Location

Township or Area: Irwin

Latitude: 49° 44' 35.64"    Longitude: -87° 47' 54.87"

UTM Zone: 16    Easting: 442464.46   Northing: 5510388.97    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12NW

Point Location Description: Mine site - shaft

Location Method: Data Compilation

Access Description: The property is located in northeastern Irwin Township, immediately south of the Namewaminikan (Sturgeon) River. The mine site can be reached by travelling north from Nezah (9.6 km west of Jellico on Highway 11) on Highway 801 for about 13 km. From this point, the mine site is located approximately 5.5 km northwest on a Ministry of Natural Resources garbage disposal road.

Exploration History

1934: 12 claims staked and transferred to the Brennan and Kenty Brothers Prospecting Co Ltd. A total of 30 ass. days were credited to each claim for surface exploration, which resulted in the discovery of significant mineralization. Casey Contact Gold Mines was incorporated and optioned the property. 1934 Surface exploration (1737.4 m) consisting of stripping and trenching was performed and 16 holes totalling -35: 793.7 m were drilled. A two-compartment shaft was sunk to a depth of 64.4 m with a station cut at 30.48 m and a level established at 61 m. 1936: Casey Contact reorganized to form Brengold Mines Limited. Underground operations were resumed on both levels. 1941: A small shipment of ore sent to the Magnet Consolidated Mill for treatment. 1949: Workings were dewatered and the two levels mapped and sampled. A second small shipment of ore was sent to the Magnet Consolidated Mill for treatment. 1959: Brenbar Mines Ltd. was taken over by Becker-Banting interests (the company name was retained). 1981: Property was optioned to Goldwater Mines Ltd. Limited. Three veins were stripped, trenched and a bulk sample was taken. The workings were dewatered, mapped and sampled, and a new 2-compartment headframe was constructed. Llimited Milling was done with a 35 ton per day portable concentrating mill on site. Operations terminated. 1983: Property optioned to Numbered Ont. Co. 530260 (a subsidiary of Goldwater Res.). Mine bulk sampled, and 800-850 tons of ore shipped to the Pamour Mill in Timmins for treatment by contactor Thyssen Mining Construction of Canada Limited. 2000: Brenbar Mines Ltd. holds 12 leased claims covering the Brenbar Mine property. 2012: Brenbar Mines amalgamated into Jubilee Gold Inc.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (G White) - The Brenbar property is located in the southwest portion of the Onaman-Tashota Metavolcanic belt, just north of the Paint Lake Fault. Rocks in this part of the belt are dominated by intermediate to felsic metavolcanics.

Dec 07, 2005 (B Nelson) - The area is underlain by east-trending deformed tuff-breccia, pyroclastic breccia, and fine-grained flows and tuffs of intermediate to felsic composition. Tourmalinization has occurred in some of the volcanic rocks. Quartz feldspar porphyry outcrops in the northeastern part of the claim group. Units dip about 70 degrees to the south. The more important showings are located along an east-west ridge that extends over parts of three claims. They occur in a highly chloritic tuff, which has been strongly sheared at N80E. In places the rock becomes quite agglomeratic, but shearing commonly tends to destroy the usual fragmental appearance. The fine-grained tuff in places shows faint bedding parallel to the schistosity, and in one outcrop excellent bedding was observed. The veins are more or less parallel to the schisting, but in some cases they cut across it. All but 3 of the veins thus far uncovered have a general easterly trend and seem to follow a definite fracture system. Veins no. 3, 4, and 5 strike north, a fact suggesting that there may be two sets of vertical fractures in the pattern. There is some evidence, however, of folding, and it may be assumed that the northerly veins occur in drag folds. If this is true, veins No. 1, 2, 7, and 4 may be one and the same vein. Likewise, Nos. 6 and 3 may be a single vein. Most of the veins have features in common. They are narrow and lens-like, follow curved fractures, and pinch and swell in a characteristic manner along both the strike and dip. The veins are crack-seal lenticular products of ductile deformation. Widths range from 1 cm to 1 m.

Lithology

Mineralization

Mineralization Comments

Dec 07, 2005 (G White) - Much of the past production was sporatic and limited to between 1941 and 1949. It appears that only 196 oz Au was milled from 149 tons at a grade averaging from 0.365 to 0.909 oz/Ton Au during this period. However, values found in the files were inconsistent.

Dec 07, 2005 (B Nelson) - Mineralization is sparse and confined largely to the quartz. It consists of py, gn sp, native gold, and a little cp. The gold is a pale variety found in several associations. Gn and sp appear to be favoured, since the presence of either of these minerals commonly indicates gold in greater quantities than ordinary. The No. 2 vein was sampled on surface and found to carry values averaging 1.42 oz/ton Au over an average width of 63.5 cm for 25.9 m. The No. 7 vein has provided assays averaging 0.767 oz/ton Au over a width of 0.61 m for 25.91 m. On the 100 foot level this vein was developed and carried values averaging 0.846 oz/ton Au over a width of 0.61 m for 33.53 m. Four channel samples across the No. 17 vein are reported to have assayed 0.56, 0.74, 0.92 and 1.02 oz/ton Au respectively.

Alteration Comments

Dec 07, 2005 (B Nelson) - Alteration of the wallrocks is not strong but results mainly in the addition of silica, carbonate, pyrite and sericite. The quartz is rather milky, well-fractured and finely grained.

Mineral Record Details

Site Visit Information

Date: Dec 19, 1996

Geologist: B Nelson

Notes: The Beardmore-Geraldton Economic Geologist visited this occurrence June 4, 1981, June 18, 1981, July 14, 1981, August of 1981, September of 1981 (2), October of 1981, June 28, 1983, July 7, 1983, August 19, 1983, September 22, 1983, June 5, 1984, and June 12, 1984.

References

Map - Sturgeon River gold area, District of Thunder Bay, Ontario

Publication Number: ARM45A Scale: 1:63,360    Date: 1998

Author: Bruce E.L., Laird H.C.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Compilation series, Lake Nipigon sheet, District of Thunder Bay

Publication Number: P0257 Scale: 1:126,720    Date: 1984

Author: Stott G.M., McConnell C.D., Mason J.K.

Publisher Name: Ontario Geological Survey

Location:

Map - Irwin Township, District of Thunder Bay

Publication Number: P0481 Scale: 1:15,840    Date: 1997

Author: Mackasey W.O.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Mineral deposits series, Ontario mineral potential, Longlac sheet, districts of Thunder Bay and Cochrane

Publication Number: P1527 Scale: 1:250,000    Date: 1978

Author: Springer J.S.

Publisher Name: Ontario Geological Survey

Location:

Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane

Publication Number: OFR5630 Date: 1986

Author: Mason J.K., White G.D.

Publisher Name: Ontario Geological Survey

Location:

Book - GDIF 42E12NW (unpublished)

Publication Number: GDIF Date: 1988

Author: Ontario Geological Survey

Publisher Name: Ontario Geological Survey

Location:

Map - Tashota-Geraldton sheet, geological compilation series, Thunder Bay and Cochrane districts

Publication Number: M2102 Date: 1997

Author: Pye E.G., Harris F.R., Fenwick K.G., Baillie J.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Dorothea, Sandra and Irwin townships, Thunder Bay District

Publication Number: M2294 Scale: 1:31,680    Date: 1974

Author: Mackasey W.O.

Publisher Name: Ontario Division of Mines

Location:

Part - Statistical review of the mineral industry of Ontario for 1949

Publication Number: ARV59-01.001 Date: 1997

Author: Arnoldi M.G.

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 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 Page: 60-117  Date: 1998

Author: Laird H.C.

Publisher Name: Ontario Dept. of Mines

Location:

MonoMap - Geology of Dorothea, Sandra, and Irwin townships, District of Thunder Bay

Publication Number: R122 Date: 1975

Author: Mackasey W.O.

Publisher Name: Ontario Division of Mines

Location:

Article - 1981 report of the Thunder Bay Resident Geologist

Publication Number: MP101.004 Page: 39-69  Date: 1997

Author: McIlwaine W.H., Fenwick K.G., Scott J.F., Mason J.K., Schnieders B.R., Kristjansson F.J., Speed A.A., Bourdages H.M.

Publisher Name: Ontario Geological Survey

Location:

Part - Mines of Ontario in 1935

Publication Number: ARV45-01.003 Page: 77-188  Date: 1997

Author: Sinclair D.G., Keeley E.C., Cooper D.F., Weir E.B., Webster A.R.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Mines of Ontario in 1936

Publication Number: ARV46-01.003 Page: 150-152  Date: 1997

Author: Sinclair D.G., Tower W.O., Bayne A.S., Cooper D.F., Weir E.B., Webster A.R.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Mines of Ontario in 1937

Publication Number: ARV47-01.003 Page: 80-249  Date: 1997

Author: Sinclair D.G., Tower W.O., Taylor J.B., Douglass D.P., Bayne A.S., Cave A.E., Cooper D.F., Weir E.B., Webster A.R.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Mines of Ontario in 1949

Publication Number: ARV59-02 Date: 1997

Author: Williams I.

Publisher Name: Ontario Dept. of Mines

Location:

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