Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52O03NE00006

Record: MDI52O03NE00006

General

Mineral Record Identification
Record Name(s) Drum Lake # 2 - 1990, North Dunlop Lake - 1990, Ontario Gold Joint Venture - 9999
Related Record Type Simple
Related Record(s)
Record Status Occurrence
Date Created 1990-Nov-28
Date Last Modified 2022-Sep-27
Created By
Revised By

Commodities

Primary Commodities: Gold



Location

Township or Area: Drum Lake Area

Latitude: 51° 14' 14.28"    Longitude: -91° 1' 20.11"

UTM Zone: 15    Easting: 638062.749   Northing: 5678072.411    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52O03NE

Point Location Description: Small outcrop 400 m north of small lake known locally as Dunlop Lake.

Location Method: Data Compilation

Access Description: The occurrence is located about 61 km southwest of Pickle Lake. It is about 2 km southwest of Mousetrap Lake and 400 m north of a small lake known locally as Dunlop Lake. Access to this occurrence is by appropriately equipped aircraft to Mousetrap Lake and traversing overland to the trenches. Small helicopters may be able to land near Dunlop Lake.



Exploration History

1972: Cochenour Willans Gold Mines Ltd. and Selco Exploration Company Ltd., in joint venture, did an airborne geophysical survey of the area and followed up with ground magnetometer and electromagnetic surveys in the Dunlop Lake area. 1978: Cominco Ltd. commissioned an airborne magnetometer survey over the Dunlop Lake area. 1979: Cominco Ltd. did ground magnetometer, electromagnetic, and gravity surveys and geological mapping on claims covering the South Dunlop Lake occurrence. 1981: Cominco Ltd. drilled a 99 m diamond-drill hole west of the South Dunlop Lake occurrence. 1984-1988: The Ontario Gold Joint Venture (Northern Dynasty Exploration Ltd., Westfield Minerals Ltd. and Newfield Minerals Inc.) conducted a multi-phased exploration program on claims covering the South Dunlop Lake occurrence. The work included airborne magnetometer and electromagnetic survey, ground magnetometer and electromagnetic surveys, geological mapping, rock and soil geochemistry, stripping and trenching, sampling and 3 diamond-drill holes totalling 144.47 m. 1986: Geocanex Ltd. commissioned airborne magnetometer and electromagnetic surveys over an area which included the South Dunlop Lake occurrence.


Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Meen-Dempster

Geological Age: Neoarchean  



Geology Comments

Dec 07, 2005 (B Nelson) - This occurrence is found in a chert-magnetite iron formation contained in an intermediate to felsic-metavolcanic unit. The Billett Lake deformation zone encompasses the intermediate- to felsic-metavolcanic unit and the iron formation. Both the deformation zone and the rock units strike east-southeast. At the occurrence, the iron formation is intercalated with a chlorite-sericite schist in an 8 m exposure.




Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Ironstone-unsubdivided 1 Chert/Magnetite Iron Formation Host
Schist-Unsubdivided 2 Chlorite/Sericite Host
Intermediate lava flow-unsubdivided 3 Int-Fels Metavolcanic Near

Lithology Comments

Dec 07, 2005 (B Nelson) - At the occurrence, the iron formation is intercalated with a chlorite-sericite schist in an 8 m exposure. Up to 3 percent pyrite is contained in the iron formation and in the chlorite-sericite schist.




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1PyriteEconomicOre
2MagnetiteEconomicOre
SericiteAlterationSericitization1
ChloriteAlterationChloritic2

Mineralization Comments

Dec 07, 2005 (B Nelson) - Up to 3 % pyrite is contained in the iron formation and in the chlorite-sericite schist. The best assay reported for this occurrence is 0.32 oz Au/ton over 0.7 m. North of Arrowhead Lake (local name), about 1.7 km along strike from this occurrence, Northern Dynasty Exploration Ltd. reported assays from a trench on the iron formation that averaged 0.037 oz Au/ton over 1.0 m from a brecciated quartz vein containing 15% pyrite.



Alteration Comments

Dec 07, 2005 (B Nelson) - Chloritie-sericite schist contains mineralization.




Mineral Record Details

Classification
RankClassification            
1 Lode (Gold)
Characteristics
Rank Characteristic            
1 Sheared

References

Map - Cat River-Kawinogans Lake area, District of Kenora (Patricia Portion), Ontario

Publication Number: ARM44F Scale: 1:126,720    Date: 1997

Author: Harding W.D.

Publisher Name: Ontario Dept. of Mines

Location:


Part - Geology of the Cat River-Kawinogans Lake area

Publication Number: ARV44-06.002 Date: 1997

Author: Harding W.D.

Publisher Name: Ontario Dept. of Mines

Location:


Map - Cat Lake-Pickle Lake, geological compilation series, Kenora and Thunder Bay districts

Publication Number: M2218 Scale: 1:253,440    Date: 1976

Author: Sage R.P., Breaks F.W., Troup W.R.

Publisher Name: Ontario Division of Mines

Location:


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

Publication Number: R207 Date: 1982

Author: Sage R.P., Breaks F.W.

Publisher Name: Ontario Geological Survey

Location:


Map - Precambrian geology, Muskegsagagen-Bancroft lakes area, District of Kenora (Patricia Portion)

Publication Number: M2507 Scale: 1:50,000    Date: 1986

Author: Stott G.M., Wilson A.C.

Publisher Name: Ontario Geological Survey

Location:


Mono - Mineral Deposits of the Central Portion of Uchi Subprovince, Volume 1, Meen Lake to Kesagiminnis Lake Portion

Publication Number: OFR5869 Page: 65  Date: 1993

Author: Seim G.Wm.

Publisher Name: Ontario Geological Survey

Location:


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