Ontario Geological Survey
Permanent Link to this Record:
MDI000000001233
| Record Name(s) | Walkinshaw 1 - 1992 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2011-Apr-27 |
| Date Last Modified | 2022-Jul-15 |
| Created By | |
| Revised By |
Primary Commodities: Amethyst
Township or Area: Onion Lake Area
Latitude: 48° 37' 22.26" Longitude: -89° 1' 12.72"
UTM Zone: 16 Easting: 351129 Northing: 5387501 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52A11NE
Point Location Description: Field visit with GPS, confirmed with Google Earth
Location Method: Field Visit with GPS
Access Description: Access is provided by a logging road to the property via Highway 11-17, then north on Highway 527 for 10 km, then east on the Magone Lake gravel road for 4 km, then northerly at the set of log rollers for 3.5 km on a winding logging access road to the showing.
1992: B.A. Smith conducted prospecting and discovered the showing. 1993: Prospectors B.A. Smith, D. Gliddon, and T.J. Twomey conducted trenching, prospecting, and geological mapping. 2003: R.A. Hietapakka staked the property. 2006: R. Hietapakka conducted stripping. 2015: R. Hietapakka conducted stripping.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.15535 | 52A11NE0005 | 52A11NE0005 |
| 2.56189 | 20000014115 | 20000014115 |
Province: Superior
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Granitoid-Unsubdivided | 1 | Adjacent |
|---|---|---|---|---|
| Terrigenous-Clastic-Unsubdivided | 2 | |||
| Vein | 3 | Quartz-Amethyst | Is |
Jan 19, 2018 (Therese Pettigrew) - The property is underlain by granite of the north part of the Penassen Lakes stock. This granite is composed of medium-grained feldspar, quartz, and minor biotite. Numerous xenoliths of metasedimentary rocks are found in the granite, ranging in size from several cm to a couple hundred m in diameter. The Penassen Lakes granite intruded a package of Quetico-type metasediments to the north of the property (AFRI 52A11NE0005).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Amethyst | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Calcite | Economic | Gangue | ||||
| 3 | Barite | Economic | Gangue |
Jan 19, 2018 (Therese Pettigrew) - Amethyst veins in the Thunder Bay area are associated with granite close to the Archean/Proterozoic unconformity. The purple colour that is developed in quartz is regarded to be caused by trace amounts of iron within the crystal structure which is activated by radiation. The source of iron is from the Proterozoic-aged sedimentary rocks which lie nearly flat on top of the older Archean-aged granite basement rocks. The source of the radiation is from the granites and radioactive minerals are typically concentrated at that unconformity or ancient weathered surface between the granites and overlying sedimentary rocks. The showing consists of a 3 m wide fractured and brecciated zone within medium-grained pink granite. It strikes at 120 degrees and dips steeply north to vertical. The veins within the zone contain amethyst, quartz, calcite, and minor barite. The fracture zone is parallel to and just north of a large xenolith of metasedimentary rocks. This zone can be traced for 1 km to the west where it is associated with other amethyst showings (AFRI 52A11NE0005). Stripping has revealed an amethyst vein averaging 1 m wide over a length of 80 m (AFRI 2.56189).
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office