Ontario Geological Survey
Permanent Link to this Record:
MDI000000002302
| Record Name(s) | Current River Pegmatites - 2003, Whaleback - 2012, Whitecliff Hill - 2012, Babywhale - 2012 |
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| Related Record Type | |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 2019-Jul-25 |
| Date Last Modified | 2023-May-25 |
| Created By | |
| Revised By |
Primary Commodities: Tantalum, Granite
Secondary Commodities: Rare Earth Elements
Township or Area: Onion Lake Area
Latitude: 48° 42' 58.27" Longitude: -89° 5' 12.15"
UTM Zone: 16 Easting: 346512 Northing: 5398007 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52A11NE
Point Location Description: OGS Staff field visit July 4, 2019
Location Method: Field Visit
2012: M. Joseph conducted stripping and sampling, to evaluate the pegmatite for use in countertops, tiles, and dimension stone. 2015: G. Blakely conducted stripping and cored a 5 m hole.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.54562 | 20000009099 | 20000009099 |
| 2.51510 | 20000007212 | 20000007212 |
| 2.56648 | 20000013993 | 20000013993 |
Province: Superior
Subprovince: Quetico
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Potassic | Is |
|---|
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Garnet | Economic | Gangue | ||||
| 2 | Tourmaline | Economic | Gangue | ||||
| 3 | Muscovite | Economic | Gangue |
Jul 25, 2019 (Therese Pettigrew) - The lens-shaped dikes of this swarm occur as northeast-striking, "whale-back" glacial erosional remnants that achieve a maximum size of 100 by 300 m. Several surface specimens and grab samples were obtained that indicate the following: muscovite-rich potassic pegmatite; quartz-rich patches with blocky potassium feldspar, coarse muscovite books and sparse beryl; fine-to-medium-grained, garnet-biotite-muscovite granite; garnet-biotite-muscovite pegmatitic leucogranite; and garnet and muscovite-garnet aplite. The garnet is manganese-rich almandine with a composition of 49 to 62% almandine, 34 to 50% spessartine, 1 to 4% pyrope and 1-2% andradite. The location alongside Hwy. 527 has potassic pegmatite with blocky-white potassium feldspar (up to 50 cm long), muscovite and quartz intergrowths, coarse black tantalum-oxide minerals (ferrocolumbite with 28-31 weight% Ta205, up to 3x3x5 mm) and green beryl. Coarse muscovite books (up to 7 cm wide by 4 cm thick) occur next to quartz pods (Breaks et al., 2003).
Mono - Fertile Peraluminous Granites and Related Rare-Element Mineralization in Pegmatites, Superior Province, Northwest and Northeast Ontario: Operation Treasure Hunt
Publication Number: OFR6099 Page: 95 Date: 2003
Author: Breaks F.W., Selway J.B., Tindle A.G.
Publisher Name: Ontario Geological Survey
Location:
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