Ontario Geological Survey
Permanent Link to this Record:
MDI52P07SE00003
| Record Name(s) | Weese Lake - 1962 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1985-Jul-30 |
| Date Last Modified | 2022-Feb-24 |
| Created By | |
| Revised By |
Primary Commodities: Copper
Secondary Commodities: Gold, Nickel, Silver
Township or Area: South Of Keezhikuns Creek Area
Latitude: 51° 16' 40.22" Longitude: -88° 38' 27.14"
UTM Zone: 16 Easting: 385553 Northing: 5682001 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P02NE, 52P07SE
Point Location Description: Sample 14CM120-2 from MRD334
Location Method: Data Compilation
Access Description: Located approximately 100 km east southeast of Pickle Lake along the west-central shore of Weese Lake. Weese Lake is just northwest of Attwood Lake. Accessible by float plane from Pickle Lake.
1962: Ground MAG, and EM, geological mapping, trenching and prospecting. - New Jersey Zinc Expl. 1963: Ground EM and 9 ddh - New Jersey Expl. Company. 1970: Combined EM by Canadian Onex Mines Ltd., through McPhar Geophysics Ltd. 1972: Ground EM and MAG. - Imperial Oil Enterprises Ltd. 1976: The Attwood Lake area, including Weese and Hurst lakes, was mapped in detail by Henry Wallace of the OGS at 1: 15 840.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.1175 | 52P07SE9167 | 52P07SE9167 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Miminiska-Fort Hope
Geological Age: Archean
Sep 29, 2006 (Mark Puumala) - The Weese Lake occurrence is located near the southern margin of the Uchi Subprovince within an anorthosite to anorthositic gabbro intrusion. The anorthosite body is an approximately 600 to 700 m wide sill-like intrusion that is bounded to the west by granitic rocks of the Shabuskwia Lake batholith and to the east by a supracrustal sequence dominated by mafic to intermediate metavolcanic rocks. However, the eastern intrusive contact in the vicinity of the occurrence is with a thin sequence of metasedimentary rocks mapped by Wallace (1981) as quartz-feldspar-biotite schist. The host intrusion appears to be one of a series of mineralized mafic/ultramafic bodies located near the southern and eastern margins of the Shabuskwia Lake Batholith between Shabuskwia and Weese Lakes. Mason et al. (2000) interpret this series of occurrences to be associated with a continuous 600 to 700 m thick anorthositic gabbro sill. The Cryderman showing is described by McNamee (1962) as occurring in a quartz filled shear striking between 160 and 138 across anorthosite and gabbro. Other chalcopyrite mineralized shears found further to the south are indicated to strike between 120 and 165. Mapping carried out by Wallace (1981) has inferred the presence of a major syncline with a northwesterly-trending axis to the east of this occurrence and a number of west-northwesterly striking faults and lineaments to the south and east.
| Rock Type | Rank | Composition | Texture | Relationship | Gabbroid-Unsubdivided | 1 | Bytownite Anorthosite | Host |
|---|---|---|---|---|
| Vein | 2 | Quartz Chalcoyrite | Host | |
| Gabbro | 3 | Gabbro | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Pyrrhotite | Economic | Ore | ||||
| 4 | Magnetite | Economic | Ore |
Sep 29, 2006 (Mark Puumala) - Mineralization within the anorthosite is summarized by McNamee (1962) as consisting of sparsely disseminated chalcopyrite and pyrrhotite (nickeliferous). The mineralization occurs in a zone that parallels the contact between the anorthosite and metasedimentary rocks for a strike-length of approximately 700 m. Higher concentrations of mineralization occur in shears containing chalcopyrite mineralized quartz and quartz-tourmaline veins. The most significant copper showing (Cryderman Showing) occurs within one of these mineralized deformation zones. This zone contains 4 to 6% chalcopyrite over a width of 60 cm to 1 m, and is exposed for a strike length of approximately 30 m. The most favourable surface sample assay results obtained from the area were 10.8% Cu, 0.09 oz/ton Au and 1.55 oz/ton Ag in a sample of chalcopyrite float found along the west shore of Weese Lake, while the most favourable assay reported from New Jersey Zinc's 1963 diamond drilling program was 1.75% Cu over 2.4 feet, immediately below the Cryderman Showing.
Mar 31, 2021 (Therese Pettigrew) - Sample 14CM120-2 returned 8305 ppm Cu from rusty quartz veining and chalcopyrite, up to 1%, in leucocratic gabbro. Sample 14CM105 returned 3020 ppm Cu from leucocratic sheared anorthosite with 10% disseminated magnetite, 80% brown-green amphibole and 10% plagioclase, strong foliation that occurs within a highly magnetic shear zone with up to 5% sulphides and some chalcopyrite. Two samples from float returned 2740 and 2915 ppm Cu (MRD334).
| Rank | Classification |
|---|---|
| 1 | Mafic-Ultramafic Intrusion |
| Rank | Characteristic |
|---|---|
| 1 | Disseminated |
| 2 | Intrusive |
Map - Fort Hope-Lansdowne House sheet, geological compilation series, Cochrane, Kenora, and Thunder Bay districts
Publication Number: M2237 Scale: 1:253,440 Date: 1972
Author: Thurston P.C., Carter M.W., Riley R.A.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Mono - Report of Activities 1999, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North-Sioux Lookout Districts
Publication Number: OFR6004 Scale: Date: 2000
Author: Mason J.K., Farrow D.G., Seim G.Wm., White G.D., O'Brien M.S., Walden A., Komar C.L.
Publisher Name: Ontario Geological Survey
Location:
Map - Attwood Lake, Thunder Bay District
Publication Number: M2436 Scale: 1:31,680 Date: 1981
Author: Wallace H.
Publisher Name: Ontario Geological Survey
Location:
Mono - Operation Fort Hope
Publication Number: MP042 Scale: Date: 1970
Author: Thurston P.C., Carter M.W.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Map - Ontario geological map, west central sheet
Publication Number: M2199 Scale: 1:1,013,760 Date: 1970
Author: Ayres L.D., Lumbers S.B., Milne V.G., Robeson D.W.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
MonoMap - Geology of the Attwood Lake area, District of Thunder Bay
Publication Number: R203 Scale: Date: 1981
Author: Wallace H.
Publisher Name: Ontario Geological Survey
Location:
Map - Precambrian Geology of the Attwood Lake Area, Fort Hope Greenstone Belt
Publication Number: P3800 Scale: 1:50,000 Date: 2016
Author: Azar B., Ferguson S.A., Mayer C.
Publisher Name: Ontario Geological Survey
Location:
Mono - Mineral Occurrences and Prospects in the Fort Hope-Winisk Area
Publication Number: OFR5926 Scale: Date: 1995
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
Data - Geological, Geochemical and Geophysical Data from the Attwood Lake Area, Fort Hope Greenstone Belt, Northwestern Ontario
Publication Number: MRD334 Scale: Date: 2016
Author: Azar B.
Publisher Name: Ontario Geological Survey
Location:
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