Mineral Deposit Inventory for Ontario

Ministry of Energy, Northern Development and Mines

Deposit: MDI000000002350

General

Commodities

Primary Commodities: gold

Location

Township or Area: McComber

Latitude: 49° 38' 10.61"    Longitude: -87° 48' 54.66"

UTM Zone: 16    Easting: 441139   Northing: 5498511    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12NW

Point Location Description: From map in Assessment report 20000002603

Location Method: data compilation

Exploration and Mining History

1928: Property acquired by F. Morrison and T. Delbridge. 1937: F. Morrison carried out trenching and stripping. 1946: Nulac Mines Ltd. carried out surface exploration and a limited amount of diamond drilling. 1948: Sampling was conducted by Sylvanite Gold Mines Ltd. for B.L. Morrison. 1980: A. Hopkins and E. Harrington carried out a magnetometer survey. 1983: Ralph Lake Resources Ltd. carried out trenching and sampling. 1986: Norben Gold Resources Inc. 1987: Tenacity Mining Corp. Ltd. drilled 14 DDH totaling 2262.2 m. 1994: Morning Dew Exploration Ltd. carried out prospecting, mapping, stripping, and sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-geraldton

Geological Age: Archean   

Mineral Deposit Lithology

Mineralization

Mineralization Comments

10/16/2019 (T Pettigrew) - The Delbridge and Kondrat zones occur along the same narrow interflow sedimentary structure. Both the Delbridge and Kondrat mineralized zones consist of two parallel, lean oxide iron formations. The chert horizons within the banded sequence exhibit a sucrosic texture, appearing as almost a fine-grained quartzite. Magnetite is scarce, most commonly in very thin horizons, and at best increase to bands containing 5% magnetite over very narrow strike lengths. Gold mineralization is controlled by fracturing and quartz veining within and along the iron formations. The veins are typically of very limited lateral extent, usually never exceeding 2 metres in any one direction. Mapping and sampling carried out over the Delbridge zones by A.C.A. Howe International Limited has indicated that the arsenopyrite-bearing quartz veins occur where cross-fracturing within the iron formations is most intense. The fractures typically trend N20E, are 1 to 2 cm. in width, and are comprised of stringers of 60% coarse crystalline arsenopyrite (Assessment report 42E12NE0183). In 1983, the Delbridge Vein was exposed by 12 trenches and stripping over a 100 m strike length. It was described in the Ralph Lake Resources company report viz: "A banded cherty zone 1-3.5 m (3-12 feet) wide within mafic volcanic flows host several sulfide bearing quartz-carbonate veins and local narrow bands of disseminated magnetite. Arsenopyrite is the dominant sulfide. Pyrrhotite, pyrite and traces of chalcopyrite are also present. The sulphide bearing zone maintains a width of almost 2 m (5 feet) for at least 70 m (200 feet) along strike. Grab samples from within this area ... average in excess of 0.20 oz Au per ton". The most easterly deposit called the Delbridge South Vein is located about 230 m east of the Delbridge Vein in claim TB 5370. It was described in the company report viz: "The Delbridge South Vein is approximately 250 m (750 feet) east of the Delbridge Vein in a parallel stratigraphic horizon 40 m (120 feet) south. Three trenches and extensive stripping have exposed this vein for a strike length of approximately 30 m (100 feet). A 3-4 m (9-12 foot) wide siliceous cherty zone contain two 15-20 cm (6-8 inch) wide mineralized zones approximately 2 m (6 feet) apart. The northern one is a sulfide-bearing quartz carbonate vein, the southern one is a cherty zone with disseminated magnetite. A grab sample from the quartz-carbonate vein assayed 0.089 oz Au per ton, the magnetite zone assayed 0.009 oz Au per ton" (Carter, 1987). A diamond drill program of 14 holes completed by Ateba in 1987 indicated grades of gold ranging from 0.86 to 3.6 g/t Au over core lengths of between 0.45 and 1.95 m. These holes were spaced along a 600 m strike length. Sample 20985 collected in 1994 returned 0.184 oz/t Au (6.31 g/t Au) from an intensely fractured quartzite iron formation with at least 10% arsenopyrite (Assessment report 42E12NE0042). It is reported that intersections of $10.85 over 1 foot (10.63 g/t Au over 0.3 m), and $5.95 over 6.5 feet (5.83 g/t Au over 1.98 m) were obtained from the diamond drilling in 1946 (Assessment report 42E12NE0183).

References

Publication - Gold Occurrences, Prospects, and Deposits of the Beardmore-Geraldton Area, p. 497-505

Publication Number: OFR5630    Date: 1986

Author: Mason, J., White, G.

Publisher Name: OGS

Publication - Geology of McComber and Vincent Townships, p. 74-76

Publication Number: OFR5648    Date: 1987

Author: Carter, M.W.

Publisher Name: OGS

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Ministry Contact Information

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