Ontario Geological Survey
Permanent Link to this Record:
MDI42D13SE00002
| Record Name(s) | Blanket Island - 1969, Giguere - 1969 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1980-Jan-24 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Copper
Township or Area: Rossport Area
Latitude: 48° 49' 32.95" Longitude: -87° 31' 18.47"
UTM Zone: 16 Easting: 461701.69 Northing: 5408224.54 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D13SE
Point Location Description: Blanket Island.
Location Method: Conversion from MDI
Access Description: Blanket Island is located about 1 km south of Rossport and north of the west end of Whiskey Island. Access is by watercraft from Rossport.
1969: Sampling and description by Giguere (1975). No assessment files were found on record.
Province: Southern
Supergroup: Keweenawan Supergroup
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Mudstone | 1 | Rove Shale | Host |
|---|---|---|---|---|
| Vein | 2 | Calcite | Host |
Apr 29, 2019 (B Nelson) - The occurrence is classed as a 'polymetallic vein.' Giguere (1975, pp 26-27) writes that 'a copper-iron sulphide showing was noted on Blanket Island, a small islet north of the west end of Whiskey Island, near Rossport. The showing is an east-striking calcite sulphide vein that cuts the Rove shale along the south shore of the island for its entire length. The vein is about 1 m wide at the east end of the island, narrowing to 15 cm at the west end. The sulphide zone disappears under water at both ends (Giguere, 19750.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Marcasite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 1 | Calcite | Economic | Gangue |
Apr 29, 2019 (B Nelson) - Sulphide minerals comprise 50 to 70 percent of the vein material. Vein material is calcite, marcasite, and a small amount of very fine-grained chalcopyrite. Analyses of grab samples by the Mineral Resources Branch of the Ontario Division of Mines indicated trace amounts of gold and silver, and 0.01 percent each of copper, lead, molybdenum and nickel (Giguere, 1975).
| Rank | Classification |
|---|---|
| 1 | Vein |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District
Publication Number: M2232 Scale: 1:253,440 Date: 1973
Author: Carter M.W., McIlwaine W.H., Wisbey P.A.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Geology of St. Ignace Island and adjacent islands, District of Thunder Bay
Publication Number: R118 Page: 26-28 Date: 1975
Author: Giguere J.F.
Publisher Name: Ontario Division of Mines
Location:
File - Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - St. Ignace Island and adjacent islands, Thunder Bay District
Publication Number: M2285 Scale: 1:63,360 Date: 1974
Author: Giguere J.F.
Publisher Name: Ontario Division of Mines
Location:
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Page: 102-103 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
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