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Ontario Geological Survey
Permanent Link to this Record:
MDI52E07SW00002
| Record Name(s) | Falcon Island - 1943, Mica Point - 1885 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1987-Apr-10 |
| Date Last Modified | 2023-May-24 |
| Created By | |
| Revised By |
Primary Commodities: Mica, Feldspar (Nonmetals), Beryllium
Secondary Commodities: Talc
Township or Area: Sabaskosing Bay Area
Latitude: 49° 19' 43.06" Longitude: -94° 46' 27.14"
UTM Zone: 15 Easting: 371089.147 Northing: 5465502.934 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52E07SW
Point Location Description: Precise
Location Method: Conversion from MDI
1885: Two locations were worked for mica. One pit was 39' long x 6-8' wide x 8' deep. This was later widened to 22'. Some mica was used in coal stoves in Rat Portage. 1927: Winnipeg Roofing Company removed a few hundred tons of spar of which some was shipped to the company's plant in Winnipeg for stucco purposes. 1943: Falcon Island Mining Company Limited was formed in Winnipeg to exploit the deposit on Mica Point. No data on operations, if any, is available. 1955: Property examination performed upon request from the Ontario Department of Mines, Mining Recorder Office at Kenora.
May 24, 2023 (Therese Pettigrew) - Along the shoreline, the grayish-black rock shows a small degree of schistosity with minute specks of mica on fresh breaks; and, further inland, the rock has a greenish appearance, is more schistose and on a fresh break, the specks of mica are not in evidence and seem to be altered to chlorite. The well-banded schists strike roughly east-west and dip 40 -50 north. A dike of cream, pink and white feldspar, with some showings of quartz, strikes 45NW and dips 60 SW for a length of about 1/2 mile. The dike averages 10 feet in width and test pits show it to be 15 feet deep. Mica is found out cropping on the surface and along the contact walls but not in the general mass of the feldspar. Few beryl crystals have been found in the dike. Outcrops of pyroxenite, containing varying amounts of biotite, feldspar and magnetite, are common about the rim of the island (Vos et al., 1982).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Beryl | Economic | Ore | ||||
| 10 | Feldspar | Economic | Ore | ||||
| 15 | Mica | Economic | Ore |
May 24, 2023 (Therese Pettigrew) - The dike consists mainly of large pink crystals of orthoclase, with some quartz and mica which are intimately associated and, in the section, appear to be segregated in irregular vein-like streaks, in a vertical attitude. Large crystals of mica make up a very small part of the dike and most occur along the contact walls. The crystals from the northeast -wall of Pit 2 are of good quality with good splitting properties. Trimmed sheets would range from 1 inch by 2 inches up to 16 inches by 18 inches. The mica is clear, unstained, free from iron and other blemishes and is considered suitable for electrical insulation. Some of this mica, taken out in the 1880s proved to stand fire well by practical use in some coal stoves in Rat Portage. Several crystals of beryl were found in the pegmatite, the largest of which measured 8 inches in diameter and assayed 12.90% BeO (Vos et al., 1982).
Publication - Feldspar, Canada Mines Branch Publication 731
Publication Number: CMB Pub 731 Page: 61 Date: 1932
Author: Spence, H. S.
Publisher Name: Canada Mines Branch
Location: https://doi.org/10.4095/307887
Mono - Feldspar in Ontario
Publication Number: IMR003 Page: 11 Date: 1998
Author: Hewitt D.F.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Pegmatite mineral resources of Ontario
Publication Number: IMR021 Page: 20, 30 Date: 1997
Author: Hewitt D.F.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Industrial minerals of northern Ontario-supplement 1
Publication Number: OFR5388 Page: 100-101 Date: 1982
Author: Vos M.A., Abolins T., Smith V.
Publisher Name: Ontario Geological Survey
Location:
Mono - Building and ornamental stone inventory in the districts of Kenora and Rainy River
Publication Number: MDC027 Page: 106-107 Date: 1986
Author: Storey C.C.
Publisher Name: Ontario Geological Survey
Location:
Mono - An evaluation of the industrial mineral potential of parts of the districts of Kenora and Rainy River
Publication Number: OFR5718 Page: 135-137 Date: 1990
Author: Storey C.C.
Publisher Name: Ontario Geological Survey
Location:
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For detailed information regarding this mineral record please contact the Kenora Resident Geologist District Office