Ontario Geological Survey
Permanent Link to this Record:
MDI000000000333
| Record Name(s) | East Lake St. Joseph Pegmatite - 2003 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 2007-Jun-21 |
| Date Last Modified | 2023-Jun-09 |
| Created By | |
| Revised By |
Primary Commodities: Niobium
Township or Area: Osnaburgh Lake Area
Latitude: 51° 8' 6.78" Longitude: -90° 15' 4.08"
UTM Zone: 15 Easting: 692310 Northing: 5668454.99 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52O01NE
Point Location Description: OFR 6099
Location Method: Data Compilation
Sampled by Breaks et al. (2003).
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Lake St. Joseph
Geological Age: Neoarchean
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Host |
|---|
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Ferrocolumbite | Economic | Ore |
Jun 21, 2007 (Mark Puumala) - This occurrence is based on the reported presence of the niobium-bearing mineral ferrocolumbite in a pegmatite dike located on an island in the eastern portion of Lake St. Joseph near Osnaburgh House (Breaks et al. 2003). The pegmatite is described as an extensively sheared and boudinaged, 3 to 5 m wide dike of white pegmatite hosted by metawacke. The pegmatite is further described by Breaks et al. (2003) as consisting of coarse-grained, green muscovite-rich potassic pegmatite gradational into quartz-rich patches with blocky potassium feldspar and white aplite containing garnet. Breaks et al. (2003) indicate that this pegmatite may be genetically related to the nearby pegmatitic granite Caron Lake Pluton.
| Rank | Classification |
|---|---|
| 1 | Pegmatite |
| Rank | Characteristic |
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| 1 | Intrusive |
Mono - Fertile Peraluminous Granites and Related Rare-Element Mineralization in Pegmatites, Superior Province, Northwest and Northeast Ontario: Operation Treasure Hunt
Publication Number: OFR6099 Date: 2003
Author: Breaks F.W., Selway J.B., Tindle A.G.
Publisher Name: Ontario Geological Survey
Location:
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