Ontario Geological Survey
Permanent Link to this Record:
MDI52A10SW00037
| Record Name(s) | Gem Mountain Mine - 1992 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 1999-Aug-30 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Amethyst, Mineral Specimen
Township or Area: Tartan Lake Area
Latitude: 48° 36' 55.95" Longitude: -88° 57' 7.33"
UTM Zone: 16 Easting: 356131 Northing: 5386558 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52A10SW
Point Location Description: Cleared area visible in Google Earth
Location Method: Based on Assessment
1992-93: R. Harty and O. Harty carried out stripping.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.6162 | 52A10SW0003 | 52A10SW0003 |
| 63.6327 | 52A10SW8201 | 52A10SW8201 |
Province: Superior
Subprovince: Quetico
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Granite | 1 | Host |
|---|---|---|---|---|
| Vein | 2 | Is |
Mar 10, 2020 (Therese Pettigrew) - The host rock for the occurrence is the dark pink, feldspar-rich, massive to porphyritic Penassen Lakes granite. The granite in this par of the North of MacGregor area forms very high ridges and hills. Quartz veins with small vugs and spaces are common, striking 80 degrees. Boulders of a very coarse breccia lie at the base of a NE-trending cliff which forms the south side of a prominent ridge. The breccia zone also occurs on the north side of this ridge. Fragments in the breccia are composed of the granite, metasediments, and Sibley Group rocks. Amethyst occurs in vugs as crystals of pink, purple, and red, hematite-coated points (Garland, 1994).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Amethyst | Economic | Ore |
Mono - Amethyst in the Thunder Bay Area
Publication Number: OFR5891 Scale: Date: 1994
Author: Garland M.I.
Publisher Name: Ontario Geological Survey
Location:
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