Ontario Geological Survey
Permanent Link to this Record:
MDI52B13SW00002
| Record Name(s) | Milk Lake - 1979, Buttermilk Lake - 9999, Seine River - 9999 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1979-Jun-14 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Soapstone
Township or Area: Asmussen, McOuat Lake Area
Latitude: 48° 45' 29.7" Longitude: -91° 55' 45.4"
UTM Zone: 15 Easting: 578693.121 Northing: 5401135.216 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52B13SW
Point Location Description: Occurrence
Location Method: Conversion from MDI
Access Description: The occurrence is located 22 km west of the town of Atikokan, on the south boundary of Asmussen Township, on the western shore of Milk Lake. The occurrence is quite inaccessible. The CNR passes 3 km to the south and Highway 11, 4 km south of the occurrence. There is no road or water access to the occurrence from these routes.
There is no recorded development of this occurrence.
Province: Superior
Subprovince: Wabigoon
Geological Age: Archean
Dec 07, 2005 (R Degagne) - The area was mapped by Moore (1940) and Fumerton (1986). The area in the vicinity of the occurrence is underlain by mafic to intermediate and intermediate to felsic metavolcanics. Dioritic to tonalitic and granitic plutonic rocks lie to the northeast and metasediments to the south (Fumerton 1986) . The occurrence was described by Tanton (1927), Moore (1940) and Spence (1940). Tanton (1927) notes: '...a rectangular area, measuring about 400 feet on each side, underlain by a contorted, dark green, chlorite schist believed to be a highly altered, basic, pyroclastic rock. The schist is traversed by a few irregularly disposed aplite seams and lenses with an average width of 6 inches, which follow the bends in the schistosity for distances of a few feet and, in one case, scores of feet. The rock along the margins and beyond the terminations of these seams has been altered to grey soapstone and consists of talc with a small percentage of serpentine. The soapstone merges with both the aplite and the chlorite schist. The largest observed soapstone mass is 25 feet wide. It strikes northwesterly from the lake shore and may be safely assumed to have a length of at least 100 feet. Four other irregular, lenticular masses are partly exposed, with maximum known widths of 4 feet and lengths of 12 feet; and there are other small masses....The rock outcrops in this vicinity are sufficiently numerous to show that the dark green, soapstone-bearing schist is of restricted extent. Beyond where the soapstone occurs the schist is visible for only a few hundred feet south and in that direction no soapstone outcrops. Massive pillow lavas and pyroclastics of intermediate composition cut by pegmatite and aplite dykes outcrop around the area underlain by the dark green schist.
| Rock Type | Rank | Composition | Texture | Relationship | Intermediate lava flow-unsubdivided | 1 | Near |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Variably Pillowed, Pyroclastic | Host | |
| Granitoid-Unsubdivided | 3 | Near | ||
| Ultramafic Schist | 4 | Soapstone; Chl, Tlc, Srp | Variably Aplitic | Contains |
Dec 07, 2005 (R Degagne) - The area was mapped by Moore (1940) and Fumerton (1986). The area in the vicinity of the occurrence is underlain by mafic to intermediate and intermediate to felsic metavolcanics. Dioritic to tonalitic and granitic plutonic rocks lie to the northeast and metasediments to the south (Fumerton 1986) . The occurrence was described by Tanton (1927), Moore (1940) and Spence (1940). Tanton (1927) notes: '...a rectangular area, measuring about 400 feet on each side, underlain by a contorted, dark green, chlorite schist believed to be a highly altered, basic, pyroclastic rock. The schist is traversed by a few irregularly disposed aplite seams and lenses with an average width of 6 inches, which follow the bends in the schistosity for distances of a few feet and, in one case, scores of feet. The rock along the margins and beyond the terminations of these seams has been altered to grey soapstone and consists of talc with a small percentage of serpentine. The soapstone merges with both the aplite and the chlorite schist. The largest observed soapstone mass is 25 feet wide. It strikes northwesterly from the lake shore and may be safely assumed to have a length of at least 100 feet. Four other irregular, lenticular masses are partly exposed, with maximum known widths of 4 feet and lengths of 12 feet; and there are other small masses....The rock outcrops in this vicinity are sufficiently numerous to show that the dark green, soapstone-bearing schist is of restricted extent. Beyond where the soapstone occurs the schist is visible for only a few hundred feet south and in that direction no soapstone outcrops. Massive pillow lavas and pyroclastics of intermediate composition cut by pegmatite and aplite dykes outcrop around the area underlain by the dark green schist.
| 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 | Serpentine | Economic | Gangue | ||||
| Talc | Alteration | Steatization | 1 | ||||
| Chlorite | Alteration | Steatization | 2 | ||||
| Serpentine | Alteration | Steatization | 3 |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Unknown | 30 | 7 |
Date: Mar 05, 1997
Geologist: R Degagne
Notes: N/A
Part - Geology and ore deposits of the Atikokan area
Publication Number: ARV48-02.001 Page: 34 Date: 1997
Author: Moore E.S.
Publisher Name: Ontario Dept. of Mines
Location:
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:
Book - RES. GEOL. FILES
Publication Number: N/A Date: 1997
Author:
Publisher Name:
Location: Thunder Bay RGP
MonoMap - Geology of the Righteye Lake area, District of Rainy River
Publication Number: R239 Date: 1986
Author: Fumerton S.L.
Publisher Name: Ontario Geological Survey
Location:
Publication - Talc, steatite, and soapstone; pyrophyllite; Canada Mines Branch, Publication 803
Publication Number: CMB Pub 803 Date: 1940
Author: Spence, H.S.
Publisher Name: Canada Mines Branch
Location: https://doi.org/10.4095/307947
Publication - Mineral Deposits of Steeprock Lake map area, Ontario; Geological Survey of Canada, Summary Report (1925), C
Publication Number: Sum Rep 1925 C Page: 10-11C Date: 1927
Author: Tanton, T L
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/103444
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