Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI53B02NW00002

Record: MDI53B02NW00002

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Kecheokagan Lake Area

Latitude: 52° 10' 59.2"    Longitude: -90° 45' 21.33"

UTM Zone: 15    Easting: 653417.799   Northing: 5783778.581    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 53B02NW

Point Location Description: General

Location Method: Conversion from MDI

Exploration History

1975-76: Geological, geochemical and geophysical surveys, and diamond drilling by Dome Exploration (Canada) Limited. 1981: Geological, geochemical and geophysical surveys by Norcen Energy Resources Ltd. 1991-95: Prospecting, sampling and diamond drilling by Jean Dignard,

Assessment Work on File

Geology

Province: Superior

Subprovince: Berens River

Terrane: North Caribou

Geological Age: Archean  

Lithology

Mineralization

Mineralization Comments

Mar 07, 2008 (Mark Puumala) - Geological mapping carried out in the immediate area of the occurrence by Dome Exploration (Morris 1975) indicated that the dominant rock types are mafic to intermediate metavolcanics and gabbro. The metavolcanics are generally found to the southwest of the showing and are described as fine-grained andesite that exhibits variable chloritic alteration. Local shearing and quartz veining were also noted by Morris (1975) in the metavolcanic rocks. Further to the south, Morris (1975) also mapped metasedimentary rocks consisting of impure quartzite, greywacke and arkose. Outcrops to the northeast and north of the showing are reported by Morris (1975) to consist largely of medium to fine-grained gabbro. Dignard (1995) reported that the showing is located approximately 400 m to the north of a contact with rocks mapped as granodiorite by Morris (1975) and as orthogneiss by Jensen (1989). The most notable structural features described by Morris (1975) in the vicinity of the occurrence include steeply-dipping and generally east-striking layering in the metasedimentary rocks, and north-striking fractures and minor shears with associated quartz veining. Some east-striking fractures and shears were also noted by Morris (1975). Morris (1975) indicates that gold mineralization at this location occurs in northwest-striking quartz veins. These veins are located along and parallel to the contacts between gabbroic rock and later intermediate (described as andesitic) and felsic dikes. The gabbroic rocks are described as gabbroic-textured mafic metavolcanics by Talbot (1996). Some short and irregular quartz veins that extend into the dikes and mafic metavolcanics are also reported. Talbot (1996) reported that the quartz veins are mineralized with 3 to 5% blebby pyrite and pyrrhotite. Morris (1975) reported several significant gold assays from a surface trenching and sampling program that was carried out on the occurrence by Dome Exploration. The most notable assay result was 0.78 oz/ton Au across 6 cm of quartz vein material (presumably a chip or channel sample). During 1976, Dome Exploration advanced two diamond drill holes to test the occurrence at depth (AFRI# 53B02NW0003). Both drill holes intersected zones with narrow (centimetre-scale) quartz veinlets hosted in metavolcanic rocks (dacite and andesite). Although no assay results are provided in the assessment file, visible gold was reported to be present in a 5 cm wide quartz veinlet that was intersected at a depth of 45.8 m in drill hole S-14. Minor pyrite, chalcopyrite and galena were also noted in this vein. Since 1976, this occurrence has been explored by Norcen Energy Resources (McWilliams, Gillan and Smith 1981) and Jean Dignard (Dignard, 1994, 1995 and 1996). Significant surface sample assay results include 23.36 g/t Au and 7.8 g/t Ag from a chip sample collected across the width of one of the veins by McWilliams, Gillan and Smith (1981), and 15.9 g/t Au and 3.8 g/t Ag from a grab sample collected by Talbot (1996). Dignard (1994, 1995 and 1996) reported no significant assay results from seven shallow (all less than 26 m deep) backpack diamond drill holes that were drilled in the vicinity of the occurrence.

Mineral Record Details

References

File - Resident Geologist files: Summary technical report, OPAP 1995, Horseshoe Lake diamond drill program

Publication Number: AFTB53B02NW0020 Date: 1995

Author: Dignard, J.R.

Publisher Name:

Location: Thunder Bay RGP

MonoMap - Geology of the Horseshoe Lake area, District of Kenora (Patricia Portion)

Publication Number: OFR5704 Date: 1989

Author: Jensen L.S.

Publisher Name: Ontario Geological Survey

Location:

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Ministry Contact Information

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