Ontario Geological Survey
Permanent Link to this Record:
MDI000000002290
| Record Name(s) | Frenche Lake Horizon - 1986 |
|---|---|
| Related Record Type | |
| Record Status | Occurrence |
| Date Created | 2019-Apr-30 |
| Date Last Modified | 2021-Dec-15 |
| Created By | Therese Pettigrew |
| Revised By | Therese Pettigrew |
Primary Commodities: Copper
Secondary Commodities: Zinc
Township or Area: Killraine
Latitude: 48° 52' 49.4" Longitude: -87° 18' 51.1"
UTM Zone: 16 Easting: 476964 Northing: 5414207 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D14NW
Point Location Description: DDH VL-10 on map in Assessment file 42D14NW8293
Location Method: Data Compilation
1986: Noranda carried out geological mapping and EM and magnetic surveys. 1987: Noranda drilled 2 DDH totalling 267.3 m. 1990-92: Minnova Inc. carried out geological mapping, EM surveys, and drilled 11 DDH, including 1 DDH totalling 972.2 m on this horizon.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 16 | 42D14NW8293 | 42D14NW8293 |
| 15 | 42D14SW0028 | 42D14SW0028 |
| 2.14325 | 42D14NW0513 | 42D14NW0513 |
| 2.9454 | 42D14SW0029 | 42D14SW0029 |
| 2.10208 | 42D14SW0025 | 42D14SW0025 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Basalt |
|---|---|---|---|---|
| Felsic lava flow-unsubdivided | 2 | Rhyolite | ||
| Quartz-Feldspar Porphyry | 3 | Dykes |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Chalcopyrite | Economic | Ore | ||||
| 4 | Sphalerite | Economic | Ore | ||||
| 1 | Andalusite | Economic | Gangue |
Apr 30, 2019 (Therese Pettigrew) - The Frenche Lake Horizon consists of intercalated altered basalt and rhyolite with a 10 cm Cu-rich stringer zone consisting of 0.82% Cu and 0.03% Zn within 1 m of the contact. Alteration consisted of biotite-cordierite-anthophyllite in the mafics and sericite-cordierite-biotite +/- andalusite in the felsics. Stringer mineralization in the footwall basalts and hanging wall altered felsics consisted of 2-7% stringer and bleb pyrrhotite-pyrite +/- chalcopyrite +/- sphalerite. Most of the anomalous metal-bearing mineralized zones in the basalts were associated with altered zones and/ore were proximal to 3 of the 5 quartz-feldspar porphyry/felsic dykes intruding them, with assays of up to 1.1% Cu and 0.25% Zn (Assessment report 42D14NW8293).
Map - Schreiber area, District of Thunder Bay, Ontario
Publication Number: ARM47J Scale: 1:31,680 Date: 1997
Author: Bartley M.W., Harcourt G.A.
Publisher Name: Ontario Dept. of Mines
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
Map - Geological series, Precambrian geology of the Schreiber area, east part, Thunder Bay District
Publication Number: P2391 Scale: 1:15,840 Date: 1981
Author: Carter M.W.
Publisher Name: Ontario Geological Survey
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office