Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42C03SW00050

Record: MDI42C03SW00050

General

Mineral Record Identification
Record Name(s) Dorset Shear - 1989
Related Record Type Simple
Related Record(s)
Record Status Prospect
Date Created 2001-Oct-26
Date Last Modified 2022-Sep-13
Created By
Revised By

Commodities

Primary Commodities: Gold



Location

Township or Area: Mishibishu Lake Area

Latitude: 48° 2' 18.92"    Longitude: -85° 25' 40.77"

UTM Zone: 16    Easting: 617175.61   Northing: 5321784.81    UTM Datum: NAD83

Resident Geologist District: Sault Ste. Marie

NTS Grid: 42C03SW

Point Location Description: Trenched area MLT-89-05 between Bonnema Bog and Connelly Lake

Location Method: Based on Assessment

Access Description: The property is accessible via the Eagle River Mine Road. This site is located approximatley 35 to 45 km south on the Eagle River Mine road and then overland by a skidder road and ATV trails.



Exploration History

1987: San Paulo Exploration Ltd. - airborne geophysics. 1988-90: Noranda Exploration Co Ltd. - trenching, diamond drilling, stripping. 1996-98: Murgor Resources Inc. - prospecting, sampling, compilation, ground geophysics, trenching, mapping, 14 ddh (1496.5 m). 1998-99: Battle Mountain Gold - 18 ddh (4298 m), trenching, geochemistry.


Assessment Work on File

Assessment Work on File
Office File Number Online Assessment File Identifier Online Assessment File Directory
WP Mishibishu Lake.57 42C03SW2007 42C03SW2007
WP Mishibishu Lake.58 42C03SW2003 42C03SW2003
WP Mishibishu Lake.59 42C03SW2004 42C03SW2004
WP Mishibishu Lake.60 42C03SW2006 42C03SW2006
WP Mishibishu Lake.62 42C03SW2008 42C03SW2008
WP Mishibishu Lake.46 42C04SE0025 42C04SE0025
WP Mishibishu Lake.32 42C03SW0056 42C03SW0056
WP Mishibishu Lake.10 42C03SW0080 42C03SW0080
WP Mishibishu Lake.56 42C03SW2002 42C03SW2002
WP Mishibishu Lake.55 42C03SW0049 42C03SW0049

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Michipicoten

Tectonic Assemblage: Catfish

Geological Age: Neoarchean   Geochronological Age: 2.7 GA   Geochron. Age Ref.: GOO VOL 1



Geology Comments

Dec 07, 2005 (A Wilson) - The strike length of the RLDZ is 8 km and the maximum width is 1 km. The RLDZ is centred within a clastic metasedimentary rock sequence which exhibits sheared contacts with felsic intrusive rocks to the north and mafic metavolcanics to the south. The style of deformation and alteration observed in the RLDZ is similar to, yet not as intensely developed as the MDZ. The penetrative foliation strikes 285, dips moderately steeply to the north. Variable trending, moderately to steeply plunging stretchin lineations are commonly obscured or overprinted by crenulation lineattions. The RLDZ possesses structural characteristics similar to the other deformation zones in the belt. Felsic intrusive dikes/sills are common and concentrated within the central and northern parts of the zone, ranging in thickness from centimetres to several hundred metres.




Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Schist-Unsubdivided 1 Chlorite-Sericite Host
Mafic lava flow-unsubdivided 2 Hanging Wall
Terrigenous-Clastic-Unsubdivided 3 Silstone Footwall

Lithology Comments

Dec 07, 2005 (A Wilson) - The occurrence consists of an easterly-trending intercalated sequence of mafic to felsic to intermediate volcanic rocks, clastic metasedimentary rocks and siliceous lean iron formation. The volcanic rocks comprise massive flows with minor tuffaceous horizons. The clastic sedimentary rocks include greywackes and minor conglomerate. The shear zones and deformation zones are located along lithologic contacts.




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1GoldEconomicOre
1PyriteEconomicGangue
2ArsenopyriteEconomicGangue
3PyrrhotiteEconomicGangue
4ChalcopyriteEconomicGangue
SilicaAlterationSilicification1StrongReplacement
AnkeriteAlterationCarbonatization2StrongReplacement
AlbiteAlterationAlbitization3StrongReplacement

Mineralization Comments

Dec 07, 2005 (A Wilson) - Channel sampling by Murgor Resources has returned the following assays: 2.67 g/t Au over 12.5 m including 4.82 g/t Au over 4.2 m; 3.66 g/t au over 10.6 m, including 6.19 g/t Au over 2.1m. Diamond drilling returned the following intersections: 0.11 oz/t Au over 72 ft, including 18 ft grading 0.17 oz/t Au; 0.05 oz/t au over 87; including 19 ft @ 0.12 oz/t Au. Gold mineralization occurs in albitized-carbonatized-sulphidized shear zones. The gold appears to be strongly associated with albite and pyrite-arsenopyrite content. Visible gold mineralziation can occur within discrete-late quartz veins, which often cross cut the entire zone.



Mineral Record Details

Characteristics
Rank Characteristic            
1 Sheared
2 Stratabound

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Shear

Zone Name: Detour Lake - Rank 1
Shape Length Thickness Depth Strike Dip Plunge Trend Age Reference
Regular 4000 285 55 60

References

File - Resident Geologist files WP Mishibishu Lake.41

Publication Number: Date:

Author:

Publisher Name:

Location: SSM RGP office


Map - Geological series, Precambrian geology, Mishibishu Lake area, northeastern section, districts of Thunder Bay and Algoma

Publication Number: P2970 Scale: 1:15,840    Date: 1986

Author: Bowen R.P., Logothetis J., Heather K.B.

Publisher Name: Ontario Geological Survey

Location:


Map - Precambrian geology, Mishibishu Lake area, Mishibishu Lake sheet

Publication Number: P3152 Scale: 1:15,840    Date: 1992

Author: Reid R.G., Bowen R.P., Heather K.B., Logothetis J., Reilly B.A.

Publisher Name: Ontario Geological Survey

Location:


Map - Operation Pukaskwa, University River sheet, districts of Thunder Bay and Algoma

Publication Number: P0507 Scale: 1:63,360    Date: 1997

Author: Bennett G., Thurston P.C., Giguere J.F.

Publisher Name: Ontario Dept. of Mines

Location:


Map - Operation Pukaskwa, districts of Algoma and Thunder Bay

Publication Number: P0541 Scale: 1:126,720    Date: 1997

Author: Bennett G., Thurston P.C., Giguere J.F.

Publisher Name: Ontario Dept. of Mines

Location:


Map - University River, Algoma and Thunder Bay districts

Publication Number: M2333 Scale: 1:63,360    Date: 1976

Author: Bennett G., Thurston P.C., Giguere J.F.

Publisher Name: Ontario Division of Mines

Location:


Map - Mishibishu Lake area, District of Thunder Bay, Ontario

Publication Number: ARM49J Scale: 1:63,360    Date: 1997

Author: Evans E.L.

Publisher Name: Ontario Dept. of Mines

Location:


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For detailed information regarding this mineral record please contact the Sault Ste. Marie Resident Geologist District Office