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Ontario Geological Survey
Permanent Link to this Record:
MDI53B05NE00002
| Record Name(s) | Upper Windigo Lake - 1985, West Group Quartz Vein - 1987 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1985-Jul-29 |
| Date Last Modified | 2022-Jun-07 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Upper Windigo Lake Area
Latitude: 52° 29' 6.21" Longitude: -91° 39' 3.45"
UTM Zone: 15 Easting: 591606.052 Northing: 5815845.337 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53B05NE
Point Location Description: General
Location Method: Conversion from MDI
1987: Geological mapping and assays by Orex Resources Limited.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.10863 | 53B11SW0001 | 53B11SW0001 |
| 2.988 | 53B11SW9411 | 53B11SW9411 |
| 2.11842 | 53B12SE0001 | 53B12SE0001 |
Province: Superior
Subprovince: Berens River
Terrane: North Caribou
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Granite | 1 | Granite | Adjacent |
|---|---|---|---|---|
| Vein | 2 | Host | ||
| Gabbro | 3 | Gabbro | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Chalcopyrite | Economic | Ore | ||||
| 10 | Malachite | Economic | Ore | ||||
| 15 | Pyrite | Economic | Ore |
Mar 11, 2008 (Mark Puumala) - North and Fogal (1987) describe this occurrence as a 1.9 m wide quartz vein hosted in sheared, sericitized, quartz-eye leucogranite on the south shore of Upper Windigo Lake. The vein is located in a shear zone that also marks the contact between the granite and a gabbro intrusion. This shear zone is likely to be associated with the regional-scale Windigo Lake-Horseshoe Lake shear zone (Osmani and Stott 1988). The quartz vein is oriented 099/88, and is approximately parallel to the shear zone. The host granite is reported to be silicified and cross-cut by numerous discordant quartz veinlets, while the vein contains numerous granitic inclusions. No significant veining or alteration is reported to occur in the gabbro which forms the northern margin of the vein. North and Fogal (1987) reported that the vein is exposed for a strike length of approximately 7.6 m. The vein pinches out to the west at the lakeshore and reappears in a small submerged outcrop located adjacent to the shore, while to the east it disappears under deep overburden. Mineralization in the vein is concentrated near the northern gabbro contact and consists of up to 3% chalcopyrite, 1% pyrite and 1% malachite North and Fogal (1987). The most significant assay results reported from this occurrence by North and Fogal (1987) include 5388 ppb Au from a 0.6 m channel sample, 1818 ppb Au from a 0.24 m channel sample, and 2788 ppb Au from a grab sample. All of these assays were obtained from the sulphide-mineralized portion of the vein.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
Part - Geology of the Windigo-North Caribou lakes area
Publication Number: ARV48-09 Page: 27 Date: 1997
Author: Satterly J.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of the Cat Lake-Pickle Lake area, districts of Kenora and Thunder Bay
Publication Number: R207 Page: 19 Date: 1982
Author: Sage R.P., Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
Article - Regional-scale shear zones in Sachigo Subprovince and their economic significance
Publication Number: MP141.006 Page: 53-67 Date: 1997
Author: Osmani I.A., Stott G.M.
Publisher Name: Ontario Geological Survey
Location:
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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office