Ontario Geological Survey
Permanent Link to this Record:
MDI52C11NE00055
| Record Name(s) | Rocky Islet Bay Exposure B - 9999, Exposure B - 9999 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1997-Mar-03 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Soapstone
Township or Area: Watten
Latitude: 48° 41' 24.77" Longitude: -93° 12' 27.5"
UTM Zone: 15 Easting: 484718.833 Northing: 5393040.019 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 in two locations near Rocky Islet Bay of Rainy Lake. Exposure (B) is located 1.2 km west of the bridge, in a roadside outcrop 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. Exposure B, on the highway, is approximately on strike with exposure A (Harris 1974). Layers/lenses of soft, light green, chloritic schist striking 2400 to 2600 occur within dark green metavolcanics. On the north side of the highway, two lenses of talc-tremolite schist, 1.8 by 3 m, and 3.6 by 3 m, are exposed. Talc also occurs as a thin veneer on some surfaces.
| Rock Type | Rank | Composition | Texture | Relationship | Gabbroid-Unsubdivided | 1 | Near |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Host | ||
| Schist-Unsubdivided | 3 | Chl, Tlc, Tr | Layers, Lenses In Host Rock | Contains |
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. Exposure B, on the highway, is approximately on strike with exposure A (Harris 1974). Layers/lenses of soft, light green, chloritic schist striking 2400 to 2600 occur within dark green metavolcanics. On the north side of the highway, two lenses of talc-tremolite schist, 1.8 by 3 m, and 3.6 by 3 m, are exposed. Talc also occurs as a thin veneer on some surfaces.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Talc | Economic | Ore | ||||
| 1 | Chlorite | Economic | Gangue | ||||
| 2 | Tremolite | Economic | Gangue | ||||
| 3 | Magnetite | Economic | Gangue | ||||
| Talc | Alteration | Steatization | 1 | ||||
| Chlorite | Alteration | Steatization | 2 | ||||
| Magnetite | Alteration | Steatization | 3 | ||||
| Tremolite | Alteration | Steatization | 4 |
Dec 07, 2005 (R Degagne) - Exposure B, on the highway, is approximately on strike with exposure A (Harris 1974). Layers/lenses of soft, light green, chloritic schist striking 2400 to 2600 occur within dark green metavolcanics. On the north side of the highway, two lenses of talc-tremolite schist, 1.8 by 3 m, and 3.6 by 3 m, are exposed. Talc also occurs as a thin veneer on some surfaces. The stone is pale green (talc rich) to bright green (tremolite rich). Coleman (1895) reports the rock consists mainly of talc with magnetite and minor chlorite.
Dec 07, 2005 (R Degagne) - Exposure B, on the highway, is approximately on strike with exposure A (Harris 1974). Layers/lenses of soft, light green, chloritic schist striking 2400 to 2600 occur within dark green metavolcanics. On the north side of the highway, two lenses of talc-tremolite schist, 1.8 by 3 m, and 3.6 by 3 m, are exposed. Talc also occurs as a thin veneer on some surfaces. The stone is pale green (talc rich) to bright green (tremolite rich). 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 | 3 | 1.8 | 250 |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Unknown | 3 | 3.6 | 250 |
Date: Mar 03, 1997
Geologist: R Degagne
Notes: N/A
Mono - Soapstone in Ontario
Publication Number: OFR5764 Page: 103-105 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 Date: 1974
Author: Harris F.R.
Publisher Name: Ontario Division of Mines
Location:
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