Ontario Geological Survey
Permanent Link to this Record:
MDI000000002098
| Record Name(s) | Lake Helen Uranium - 1949, Gustafson - 1949 |
|---|---|
| Related Record Type | |
| Record Status | Discretionary Occurrence |
| Date Created | 2017-Jun-22 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Therese Pettigrew |
| Revised By | Therese Pettigrew |
Primary Commodities: Uranium
Township or Area: Miller Lake Area, Booth
Latitude: 49° 5' 37.69" Longitude: -88° 16' 38.36"
UTM Zone: 16 Easting: 406750 Northing: 5438669 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52H01SW
Point Location Description: General point from a description in a May 16, 1949 newspaper article: property on east side of Lake
Location Method: Data Compilation
1949: Discovered by prospector T.A. Gustafson who conducted sampling. 1967: Aggressive Mining Ltd. Conducted trenching and sampling.
Province: Superior
Subprovince: Quetico
Geological Age: Archean
Jun 22, 2017 (Therese Pettigrew) - Quetico migmatites and gneisses underlie the property.
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Host |
|---|---|---|---|---|
| Diatexite Migmatite | 2 | Adjacent |
Jun 22, 2017 (Therese Pettigrew) - Quetico Belt migmatites and gneisses underlie the property. White, albite-rich pegmatite dikes up to 30 m wide intrude granitic gneisses and sedimentary migmatites. Some of these pegmatites have a yellow to yellow-green stain typical of uraniferous albite pegmatites of the area.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pitchblende | Economic | Ore | ||||
| 1 | Calcite | Economic | Gangue | ||||
| 2 | Albite | Economic | Gangue |
Jun 22, 2017 (Therese Pettigrew) - A news article in the May 16, 1949 edition of the Lakehead Cities News Chronicle report that T.A. Gustafson had the following assays from his samples: Sample 1: 5.5% U3O8, Sample 2: 0.009% U3O8, Sample 3: 0.025% U3O8. Gustafson reported that the three samples had been taken from 16 claims he had staked on the east side of Lake Helen, approximately 5 miles from Nipigon. The samples came from test pits 1000 feet apart. In an Oct 12, 1949 news article in the Lakehead Cities News Chronicle, the occurrence is described as a 1/4 inch thick seam of pitchblende and calcite. Work on this property by Aggressive Mining Limited in 1967 consisted of trenching and sampling of the occurrence. Values of up to 0.135% U3O8 were reported. A visit by JF Scott of the Resident Geologist Program in 1982 confirmed the existence of a 2 m x 2 m x 26 m trench located in a rectangular, stripped area on the lake's west shore. This area is distinguishable from Highway 11 on the lake's east shore. A plot of counts per minute due to uranium, thorium, and total counts indicates that the uranium is associated with the pegmatite phases rather than the biotite schists and metasedimentary portions of the migmatites (Scott, 1987).
Mono - Uranium occurrences of the Thunder Bay-Nipigon-Marathon area
Publication Number: OFR5634 Scale: Date: 1987
Author: Scott J.F.
Publisher Name: Ontario Geological Survey
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