Ontario Geological Survey
Permanent Link to this Record:
MDI52C11NE00054
| Record Name(s) | Rocky Islet Bay - Exposure A - 1897 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1997-Feb-28 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Soapstone
Township or Area: Watten
Latitude: 48° 41' 46.77" Longitude: -93° 11' 30.51"
UTM Zone: 15 Easting: 485885.668 Northing: 5393716.271 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52C11NE
Point Location Description: Occurrence
Location Method: Conversion from MDI
Access Description: The occurrence is located 14.5 km northeast of the town of Fort Frances, in Watten Township. The occurrence is exposed near Rocky Islet Bay of Rainy Lake. The exposure is on the southeastern side of a peninsula in the bay, 850 m north of the Rocky Islet Bay bridge on Highway 11.
Coleman (1895) notes that material from this site was used by indigenous peoples as pipestone.
Province: Superior
Subprovince: Wabigoon
Geological Age: Archean
Dec 07, 2005 (R Degagne) - The area was mapped by Harris (1974). The area is underlain by mafic to intermediate metavolcanic rocks. Felsic and intermediate intrusive rocks lie north of the occurrence.
| Rock Type | Rank | Composition | Texture | Relationship | Granitoid-Unsubdivided | 1 | Near |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Host | ||
| Schist-Unsubdivided | 3 | Tr-Tlc; Mag, Chl | Contains | |
| Schist-Unsubdivided | 4 | Hbl | Adjacent |
Dec 07, 2005 (R Degagne) - Harris (1974) reports a lens-shaped zone of tremolite-talc schist, 6 m by 15 m, surrounded by hornblende schist. The centre of the zone contains the most talc; the tremolite content increasing towards the outside of the zone.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Talc | Economic | Ore | ||||
| 1 | Tremolite | Economic | Gangue | ||||
| 2 | Magnetite | Economic | Gangue | ||||
| 3 | Chlorite | Economic | Gangue | ||||
| Talc | Alteration | Steatization | 1 | ||||
| Tremolite | Alteration | Steatization | 2 | ||||
| Magnetite | Alteration | Steatization | 3 | ||||
| Chlorite | Alteration | Steatization | 4 |
Dec 07, 2005 (R Degagne) - The stone is a greenish-grey talc-tremolite schist. Coleman (1895) reports the rock consists mainly of talc with magnetite and minor chlorite.
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Unknown | 15 | 6 |
Date: Feb 28, 1997
Geologist: R Degagne
Notes: N/A
Mono - Soapstone in Ontario
Publication Number: OFR5764 Date: 1991
Author: Gerow M.C., Sherlock E.J., Bellinger J.A.
Publisher Name: Ontario Geological Survey
Location:
Part - Gold in Ontario, its associated rocks and minerals
Publication Number: ARV04.002 Page: 85 Date: 1998
Author: Coleman A.P.
Publisher Name: Ontario Bureau of Mines
Location:
MonoMap - Geology of the Rainy Lake area, District of Rainy River
Publication Number: R115 Page: 16 Date: 1974
Author: Harris F.R.
Publisher Name: Ontario Division of Mines
Location:
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