Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52O02NW00002

Record: MDI52O02NW00002

General

Mineral Record Identification
Record Name(s) Dempster Southwest - 1983, Duffell Lake A - 1983, Duffell Lake #5 - 9999
Related Record Type Simple
Related Record(s)
Record Status Occurrence
Date Created 1983-Feb-28
Date Last Modified 2022-Sep-27
Created By
Revised By

Commodities

Primary Commodities: Gold



Location

Township or Area: Duffell Lake Area

Latitude: 51° 13' 41.3"    Longitude: -90° 58' 22.34"

UTM Zone: 15    Easting: 641537.764   Northing: 5677147.63    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52O02NW

Point Location Description: Noranda sample 2794 located in the NE corner of claim 732433.

Location Method: Data Compilation

Access Description: The Dempster Southwest gold occurrence is located about 58 km south of Pickle Lake. The gold occurrence is found in outcrops along the Ear Falls-Pickle Lake power line, 525 m southwest of the Kawinogans (Crow) River. Access is via appropriately equipped aircraft from Pickle Lake to a small lake just north of the occurrence (100-150 m). The small lake is part of the Kawinogans River. Under freezing conditions, a seasonal road from Pickle Lake along the Ear Falls-Pickle Lake power line may also be used to access this occurrence.



Exploration History

This occurrence was discovered by an Ontario Department of Mines geological mapping party lead by W.D. Harding (1935). He reports 'A grab sample from a mineralized quartz porphyry dyke...gave 0.02 oz/ton Au.' 1983: Noranda Exploration Company Ltd. staked 20 claims to cover the mineral occurrence. 1984: Noranda conducted an exploration program consisting of geological mapping, magnetometer and VLF-Em surveys and limited rock and humus geochemical sampling along a pace and compass, flagged-line grid. 1986: Noranda cut a grid on the property and completed geological, magnetometer, HLEM and humus geochemistry surveys on the claim group. 1990: Bond Gold Canada Ltd. acquired the Noranda claims. Geology and rock geochemistry surveys were completed over the occurrence area.


Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Meen-Dempster

Geological Age: Neoarchean  



Geology Comments

Dec 07, 2005 (B Nelson) - The Dempster Southwest gold occurrence consists of a sheared quartz-feldspar porphyry dyke mineralized with up to 2% pyrite. The porphyry is weakly altered by an unidentified carbonate species. The dyke strikes about 078 degrees and dips vertically. It has a width between 15 cm and 25 cm, and is traceable in outcrop for about 100 m. The quartz-feldspar porphyry intrudes a metasedimentary sequence of thinly bedded to laminated, siliceous greywackes.




Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Quartz Porphyry 1 Contains
Sandstone 2 Siliceous Greywacke Near

Lithology Comments

Dec 07, 2005 (B Nelson) - The quartz-feldspar porphyry intrudes a metasedimentary sequence of thinly bedded to laminated, siliceous greywackes.




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1PyriteEconomicOre
UnknownAlterationCarbonatization1Weak

Mineralization Comments

Dec 07, 2005 (B Nelson) - Mineralization occurs in the shear zone. Grab samples from the quartz-feldspar porphyry dyke returned assays up to 0.05 oz Au/ton.



Alteration Comments

Dec 07, 2005 (B Nelson) - Unknown carbonate weakly alters the porphyry.




Mineral Record Details

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

References

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:


Part - Geology of the Cat River-Kawinogans Lake area

Publication Number: ARV44-06.002 Page: 69  Date: 1997

Author: Harding W.D.

Publisher Name: Ontario Dept. of Mines

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:


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 - 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:


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

Publication Number: OFR5869 Page: 56  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