Ontario Geological Survey
Permanent Link to this Record:
MDI52C14SE00004
| Record Name(s) | Mainville Lake - 1957, Rainy Lake Mining - 1957 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1985-Jun-05 |
| Date Last Modified | 2022-Nov-04 |
| Created By | |
| Revised By |
Primary Commodities: Uranium
Township or Area: Obikoba Lake Area
Latitude: 48° 49' 17.12" Longitude: -93° 10' 46.39"
UTM Zone: 15 Easting: 486820.08 Northing: 5407620.02 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52C14SE
Point Location Description: Drillholes in AFRI 52C15SW0032
Location Method: Conversion from MDI
1955: discovered by E. Corrigan, who optioned the property to Pioneer Consultants Ltd., who conducted geological and scintillometer surveys. 1957: Rainy Lake Mining Ltd. conducted geological mapping, trenching, sampling, and drilled 5 DDH totalling 136.2 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63A.333 | 52C15SW0031 | 52C15SW0031 |
| 10 | 52C15SW0032 | 52C15SW0032 |
Province: Superior
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Pegmatite | Contains |
|---|---|---|---|---|
| Gneiss-Unsubdivided | 2 | Adjacent |
Nov 22, 2017 (Therese Pettigrew) - A large radioactive pegmatite dyke on the south shore of Otter Bay is underlain by a series of rusty weathering, biotite-hornblende gneisses. It varies from 61 to 76.2 m in width and is 243.8 m long (Robertson and Gould, 1983).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Allanite | Economic | Ore | ||||
| 2 | Uraninite | Economic | Ore | ||||
| 3 | Uranothorite | Economic | Ore | ||||
| 4 | Molybdenite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Feldspar | Economic | Gangue | ||||
| 3 | Biotite | Economic | Gangue | ||||
| 4 | Zircon | Economic | Gangue |
Nov 22, 2017 (Therese Pettigrew) - The uranium mineralization is found associated with pegmatite which intrudes rusty weathering biotite and biotite-hornblende gneiss striking N25W and dipping 60 degrees NE in the northern section and granite gneisses striking E-W in the southern section. A composite sample of pegmatite was taken by H.D. Carlson of the Ontario Department of Mines. Typical assays were 0.01 to 0.017% U3O8 (Robertson and Gould, 1983). Exploration on the property was directed during 1955 and 1957 by H. D. McLeod of Fort Frances. A grab sample taken from the southern discovery showing was reported by McLeod to contain 0.45% U3O8. During 1957 geological mapping was carried out, 5 holes between 60 and 100 feet in length were drilled at the uranium showing. Radioactivity readings up to 3.5 times background over short lengths were recorded (Blackburn, 1973).
Article - Otukamamoan Lake area, District of Rainy River
Publication Number: MP043.006 Page: 21-23 Date: 1997
Author: Blackburn C.E.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Mono - Uranium and thorium deposits of northern Ontario
Publication Number: MDC009 Page: 64 Date: 1968
Author: Robertson J.A.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of the Otukamamoan Lake area, districts of Rainy River and Kenora
Publication Number: R109 Page: 37 Date: 1973
Author: Blackburn C.E.
Publisher Name: Ontario Division of Mines
Location:
Mono - Uranium and thorium deposits of northern Ontario
Publication Number: MDC025 Page: 96 Date: 1984
Author: Robertson J.A., Gould K.L.
Publisher Name: Ontario Geological Survey
Location:
Mono - Pegmatite mineral resources of Ontario
Publication Number: IMR021 Page: 55 Date: 1997
Author: Hewitt D.F.
Publisher Name: Ontario Dept. of Mines
Location:
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