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Ontario Geological Survey
Permanent Link to this Record:
MDI52P03NE00003
| Record Name(s) | Beavis Lake - 1966, 'Heart Attack' Lake - 1966 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1985-Jul-29 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Iron
Township or Area: Beavis Lake Area
Latitude: 51° 9' 21.57" Longitude: -89° 4' 52.18"
UTM Zone: 16 Easting: 354462.693 Northing: 5669231.069 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P03NE
Point Location Description: Transfer
Location Method: Conversion from MDI
1966-67: Diamond drilling by Algoma Steel.
Province: Superior
Subprovince: English River
Geological Age: Neoarchean
Nov 09, 2006 (Mark Puumala) - This occurrence is described by Shlanka (1968) as a magnetite-quartz iron formation interbedded with metasedimentary rocks. The iron formation is also reported to contain some hematite, pyrrhotite and pyrite. Sage and Breaks (1982) further describe the iron formation as consisting of massive and banded components. The massive component consists of light to medium smoky-grey iron formation with clastic quartz and plagioclase uniformly distributed among the dominant magnetite grains. The banded units are characterized by alternating black to smoky-grey magnetite-rich bands and light brown to light grey magnetite-bearing bands of garnetiferous metagreywacke. Sage and Breaks (1982) indicate that a section of massive to banded iron formation approximately 180 m thick is present at the eastern end of Heart Attack Lake. The area of this occurrence has been pervasively injected by lit-par-lit and dfiscordant xenolith-bearing masses of coarse-grained to pegmatitic Granitic rocks (Sage and Breaks 1982). These intrusive rocks are typical of those found throughout the English River Subprovince, and are likely to make any ore reserve calculations more difficult. The iron formation at Heart Attack Lake is reported by Sage and Breaks (1982) to exhibit outcrop-scale s-folds having near-vertical axial planes and steep, east-plunging fold axes. The depositional setting for this deposit has been described by Sage and Breaks (1982) as the result of the transport of detrital magnetite and volcanogenic debris of greywacke bulk composition to the flanks of an extensive eugeosyncline.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Is |
|---|---|---|---|---|
| Sandstone | 2 | Greywacke | Adjacent | |
| Diatexite Migmatite | 3 | Granitic | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Magnetite | Economic | Ore |
Nov 09, 2006 (Mark Puumala) - A 22 kg bulk sample of the iron formation material collected by Sage and Breaks (1982) is reported to have assayed 31.2 % Fe.
| Rank | Classification |
|---|---|
| 1 | Sedimentary |
| Rank | Characteristic |
|---|---|
| 1 | Stratiform |
Map - Cat Lake-Pickle Lake, geological compilation series, Kenora and Thunder Bay districts
Publication Number: M2218 Scale: 1:253,440 Date: 1976
Author: Sage R.P., Breaks F.W., Troup W.R.
Publisher Name: Ontario Division of Mines
Location:
Mono - Iron deposits of Ontario
Publication Number: MDC011 Scale: Date: 1968
Author: Shklanka R.
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 Scale: Date: 1982
Author: Sage R.P., Breaks F.W.
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