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Ontario Geological Survey
Permanent Link to this Record:
MDI52A10SW00012
| Record Name(s) | Caribou Island - 1887, Keshkabuon - 1992 |
|---|---|
| Related Record Type | Partial |
| Record Status | Discretionary Occurrence |
| Date Created | 1992-Mar-23 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Q Unknown |
| Revised By | Therese Pettigrew |
Primary Commodities: Silver
Secondary Commodities: Amethyst
Township or Area: Lambert Island Area
Latitude: 48° 31' 31.13" Longitude: -88° 52' 5.67"
UTM Zone: 16 Easting: 362061.26 Northing: 5376374.48 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52A10SW
Point Location Description: Transfer
Location Method: Conversion from MDI
Access Description: Proceed north from Thunder Bay on Highway 11-17 to Amethyst Harbour Road. Turn right onto the road, and proceed to Perry Point. At Perry Point, launch a boat and travel 1.6 km SE of Perry Point to Caribou Island.
1887: J. Cousins carried out surface exploration work. No assessment files were found on record. 1921-22: diabase was mined from the north shore of the island for the construction of the Thunder Bay breakwater. No assessment files were found on record.
Province: Southern
Formation Group: Animikie Group
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Mudstone | 1 | Rove Shale | Adjacent |
|---|---|---|---|---|
| Diabase | 2 | Diabase Dyke | Adjacent | |
| Vein | 3 | Calcite | Host |
Dec 18, 2018 (Therese Pettigrew) - Caribou Island is a monoclinic diabase dyke reaching heights of 91 m. Rove sediments make up a major portion of the southern part of the island (RGP Mineral Deposit files, Thunder Bay office).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Amethyst | Economic | Ore | ||||
| 1 | Calcite | Economic | Gangue | ||||
| 2 | Quartz | Economic | Gangue |
Dec 18, 2018 (Therese Pettigrew) - The veins at Caribou Island as being primarily composed of calcite and secondary pyrite mineralization. Two veins exist on the property and are associated with the contact between the diabase and sedimentary rock. A hand-written report in the RGP Mineral Deposit files (Thunder Bay office) indicate that there are numerous small veinlets of quartz, amethyst, and calcite exposed along the southern shore of the western part of the island. The island was visited in 1976 by OGS staff and two veins were located. The veins were approximately 6 inches wide and about 0.5 km apart, located mainly under water, with very little of the veins exposed on the surface of the island. The veins contained calcite and abundant, fairly large pyrite crystals. The strike of the veins is approximately N65E, running fairly parallel to the shore. No mineralization other than the pyrite was mentioned.
| Rank | Classification |
|---|---|
| 1 | Vein |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
Book - RES. GEOL.MIN. DEPT. FILE, T. BAY.
Publication Number: N/A Scale: Date: 1996
Author:
Publisher Name:
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office