Ontario Geological Survey
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MDI52F07NW00008
| Record Name(s) | Bird Island - 1985 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-24 |
| Date Last Modified | 2022-Jul-07 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Harper Lake Area
Latitude: 49° 22' 45.2" Longitude: -92° 49' 2.71"
UTM Zone: 15 Easting: 513252.774 Northing: 5469629.352 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52F07NW
Point Location Description: Transfer
Location Method: Conversion from MDI
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.9657 / 52F07SW U-13 | 52F07SW0012 | 52F07SW0012 |
Province: Superior
Subprovince: Wabigoon
Terrane: Western Wabigoon
Belt: Eagle-Wabigoon-Manitou
Geological Age: Precambrian
| Rock Type | Rank | Composition | Texture | Relationship | Intermediate Tuff-Breccia | 1 | andesitic to dacitic |
|---|---|---|---|---|
| Vein | 2 | quartz-carbonate | Host |
Jul 07, 2022 (C Ravnaas) - Bird Island is predominantly underlain by andesitic to dacitic tuff breccia cut by abundant quartz-carbonate stringer systems. (Assessment File 52F07SW U-16, Kenora Resident Geologist Office)
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Gold | Economic | Ore |
Feb 23, 2010 (C Ravnaas) - Gold enrichment is almost ubiquitous in the surface rock exposures of Bird Island. At the south end of the island, a silicified felsite dike, giving consistently anomalous gold values (up to 0.10 oz/t over 3.0 m - chip), is flanked by a quartz vein containing visible gold. A grab sample from a series of discontinuous oxidized sulphidic stringers in a dacitic tuff breccia, on the north end of Bird Island, returned 2.27oz /t Au (78.1 g/t Au). Follow-up lithogeochemical samples were anomalous as well. Several anomalous gold values were returned from a small island, (Bird Island) 250 meters west of North Island, during the summer program: SOUTH ZONE: - 0.5 opt Au from a quartz vein on the north margin of a silicified felsite dike. - 0.24 opt Au over 1.0 m along the margin of the silicified felsite. - 0.39 opt Au over 1.0 m in quartz carbonate stringers in intermediate tuff breccia adjacent to felsite margin. NORTH ZONE: - 2.27 opt Au composite grab from series of siliceous sulphidic veinlets (trend 74°) in slightly sheared (50°) but otherwise unaltered in intermediate tuff breccia. A follow-up rock geochemistry survey, done over Bird Island (Oct. 18-20, 1985), identified two geologically distinctive auriferous zones as well as elevated background Au values over the entire Island. On the south end of Bird Island is a silicified felsite dike flanked by quartz veins. Chip samples returned as high as 0.1 oz/t Au across 3.5 meters. Visible gold was identified in the north flanking quartz vein. The north zone of Bird Island consists of a series of discontinuous sulphide strinqers, which crosscut the schistosity of the hosting dacitic tuff breccia. Consistently anomalous gold values were returned from chip and channel samples (chip .09 oz/t Au/3.5 m). (Assessment File 52F07SW U-16, Kenora Resident Geologist Office)
File - Resident Geologist files AF 52F07SW U-16
Publication Number: Date: 1996
Author:
Publisher Name:
Location: Kenora RGP
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