Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52G15SE00005

Record: MDI52G15SE00005

General

Commodities

Primary Commodities: Iron, Gold

Location

Township or Area: Dunne Lake Area

Latitude: 49° 51' 7.3"    Longitude: -90° 34' 18.07"

UTM Zone: 15    Easting: 674555   Northing: 5525006.99    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52G15SE

Point Location Description: DDH SL-10-19 from Assessment report 20000006201

Location Method: Data Compilation

Exploration History

1956: N. A. Timmins Exploration Ltd. carried out prospecting. 1957: N. A. Timmins Exploration Ltd. conducted ground magnetometer and dip needle surveys, an aeromagnetic survey, and drilled 8 DDH totalling 1330.8 m. 1961: Steep Rock Iron Mines Ltd. carried out a magnetometer survey. 2010: Excalibur Resources Ltd. carried out soil gas hydrocarbon surveys, mapping, and drilled 2 DDH totalling 675.05 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Sturgeon Lake

Geological Age: Archean  

Lithology

Mineralization

Mineralization Comments

Jan 30, 2020 (Therese Pettigrew) - Shklanka (1968) describes the occurrence as “Discontinuous, easterly-trending magnetite-quartz iron formation bands with a strike length of 14 miles in Archean metasedimentary schists and gneiss intruded by syenite. Some pyrite and pyrrhotite locally.” DDHs 1, 2, and 3 drilled in 1957 found that the ore is confined to one zone 290’ (88.4 m) wide which assayed 22.85% Fe and included at least 20% of small barren dyke material (Assessment report 52G15SE0018). Excalibur Resources’ DDHs SL-10-17 and SL-10-19 intersected an approximately 54.5 m (true width) zone with an average grade of 22.5% Fe. SL-10-17 to SL-10-19 targeted the large iron formation in the eastern part of the property. SL10-17 intersected several lenses of silicate facies iron formation. The lenses assayed 7.81m of 25.3% Fe, 4.25m of 25.7% Fe, 17.1m of 25.2% Fe, and 50.7m of 20.9% Fe for a total of 79.9m averaging 22.5% Fe. SL-10-19 was drilled as a continuation of the zone and intersected two lenses which assayed 23.6% Fe over 48.3m, and 11.9m averaging 22.0% Fe. When plotted up on the cross-sections, the main zone appears to have a true width of approximately 54.5m, and dipping sub-vertically. SL-10-18, which targeted a different part of the iron formation approximately 1km to the east also intersected two lenses assaying 25.0% Fe over 7.09 m and 21.7% Fe over 42.82 m. In all cases, the iron formation zones were heavily cross-cut by syenite, monzodiorite, and diorite dykes, with up to a quarter of the core across the iron formations made up of dyke material. SL-10-17 also intersected a 10.7m sulphide rich quartz vein, which consisted of large angular quartz fragments in a Po+Py+Mt matrix. This zone assayed 0.19 g/t Au over 11.8 metres, including 0.48 g/t Au over 0.3 m and 0.34 g/t Au over 1.0 m. A separate zone in the same hole assayed 1.07 g/t Au over 0.5 m (Assessment report 20000006201).

Mineral Record Details

References

MonoMap - Geology of the Metionga Lake area, districts of Thunder Bay and Kenora

Publication Number: R024 Scale:     Date: 1997

Author: Rogers D.P.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Iron deposits of Ontario

Publication Number: MDC011 Scale:     Date: 1968

Author: Shklanka R.

Publisher Name: Ontario Dept. of Mines

Location:

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For detailed information regarding this mineral record please contact the Kenora Resident Geologist District Office