Ontario Geological Survey
Permanent Link to this Record:
MDI000000003027
| Record Name(s) | Malborne Lake - 1982 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2022-Apr-21 |
| Date Last Modified | 2022-Apr-22 |
| Created By | |
| Revised By |
Primary Commodities: Uranium
Township or Area: Purdom
Latitude: 49° 11' 56.42" Longitude: -88° 25' 14.5"
UTM Zone: 16 Easting: 396503 Northing: 5450550 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52H01NE
Point Location Description: Malborne Lake showing from Assessment report 52H01NW9210
Location Method: Based on Assessment
1982: Uranerz Exploration and Mining Ltd. carried out line cutting, magnetometer and EM surveys, scintillometer survey, stream and lake sediment surveys, soil sampling, and geological mapping.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.5090 | 52H01NW9210 | 52H01NW9210 |
| 63.4151 | 52H07SW0001 | 52H07SW0001 |
| Rock Type | Rank | Composition | Texture | Relationship | Diatexite Migmatite | 1 | hematized migmatite | Contains |
|---|---|---|---|---|
| Granite | 2 | |||
| Diabase | 3 |
Apr 21, 2022 (Therese Pettigrew) - The area on the northeast part of the grid is composed of a dark green and coarse-grained diabase (Logan Sill) which is in contact to the south with migmatite extending to Malborne Lake from line 15E to line 20E. The remainder of the grid area is composed of medium- to coarse-grained pink granitic rocks which contain biotite and where a few bodies of migmatite may be present. Hematization of the granitic material was often seen and was in a few occasions accompanied by radioactivity (Assessment report 52H07SW0001).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pitchblende | Economic | Ore |
Apr 21, 2022 (Therese Pettigrew) - The Malborne Lake showing consists of a narrow (1 cm), high-grade, mineralized fracture that contains pitchblende (?), plus secondary yellow uranium minerals, probably uranophane (Scott, 1987). Fractures in hematized migmatite gave scintillometer readings of up to 15,000 c/s. In most cases hematization appears to be associated with the radioactivity. The radioactivity is also often sporadic with high values being recorded in only a few isolated portions of outcrops. Lake sediment samples returned up to 48 ppm U3O8. Soil samples returned up to 180 ppm U3O8 (Assessment report 52H07SW0001).
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