Ontario Geological Survey
Permanent Link to this Record:
MDI52P03NW00003
| Record Name(s) | 312-005 - 1988, Heather Lake # 2 - 1990, Misehkow River - 1990 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1990-Nov-29 |
| Date Last Modified | 2022-Jun-07 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Heather Lake Area
Latitude: 51° 10' 14.41" Longitude: -89° 29' 15.41"
UTM Zone: 16 Easting: 326098 Northing: 5671746 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P03NW
Point Location Description: Drill hole database.
Location Method: Conversion from MDI
1987-1988: Geophysical surveys and diamond drilling by Dome Exploration.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 10 | 52P03NW0010 | 52P03NW0010 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Lake St. Joseph
Geological Age: Neoarchean
Nov 10, 2006 (Mark Puumala) - The Dome Misehkow River gold occurrences are located in a metavolcanic and metasedimentary belt described by Sage and Breaks (1982) as the Pashkokogan Lake-Misehkow River Belt. This belt is bounded to the north by Granitoid rocks of the Kagami Pluton and Seach-Achapi Lakes Granitoid Complex (Stott 1996), and to the south by the metasedimentary migmatites of the English River Subprovince. Rocks mapped in the immediate vicinity of these occurrences by Sage and Breaks (1982) include mafic metavolcanics (dominant lithology), felsic metavolcanics, clastic metasedimentary rocks and iron formation. Diamond drill hole logs compiled by Dome Exploration at the site in 1988 provide evidence of relatively complex stratigraphy and stong deformation/alteration. The following lithologies are reported to have been encountered during diamond drilling (9 holes): mafic metavolcanics, iron formation, chlorite schist, sericite schist, intermediate tuff, greywacke, rhyolite, and one narrow (1m intersection) felsic dike.Stott and Corfu (1991) have interpreted the boundary between rocks of the 2750-2730 Ma Confederation Assemblage and 2723-2713 Ma St. Joseph Assemblage to be located in close proximity to this occurrence, along an inferred contact that is approximately coincident with the course of the Misehkow River. Confederation Assemblage rocks are located to the north of the river, and are dominated by mafic metavolcanics, while the St. Joseph Assemblage rocks are located further to the south and include mafic and felsic metavolcanics and metasedimentary rocks. The Dome Misehkow River gold occurrences are located in rocks immediately adjacent to the Confederation.St. Joseph Assemblage boundary. Sage and Breaks (1982) indicate that bedding and foliation orientations in the Pashkokogan Lake-Misehkow River Belt are generally parallel. Foliation in felsic metavolcanic rocks in close proximity to the occurrence was mapped by Sage and Breaks (1982) as having an orientation of 235/86. Based on the lithological descriptions provided in the Dome Exploration diamond drill logs, and the relative locations of the occurrences, it is probable that they are associated with an east-northeast-striking structure similar to that hosting the nearby Northern Dynasty Misehkow River prospect.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Contains |
|---|---|---|---|---|
| Schist-Unsubdivided | 2 | Chlorite Schist | Contains | |
| Mafic lava flow-unsubdivided | 3 | Near | ||
| Intermediate lava flow-unsubdivided | 4 | Near | ||
| Wacke | 5 | Greywacke | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Pyrite | Economic | Ore | ||||
| 10 | Pyrrhotite | Economic | Ore | ||||
| Chlorite | Alteration | Chloritic | 1 |
Nov 10, 2006 (Mark Puumala) - A number of anomalous assays were obtained from diamond drill hole 312-05, with the highest being 3.42 g/t over 0.35 m. These assays were obtained from samples of sulphidized magnetite-chert-amphibole iron formation and chlorite schist. The mineralized iron formation material is reported to contain up to 20% pyrrhotite and 5% pyrite, while the mineralized chlorite schist contains abundant quartz-carbonate stringers and disseminated sulphides (up to 3% pyrrhotite, 1% pyrite and trace arsenopyrite).
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| 2 | Replacement |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
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:
MonoMap - Geology of the Cat Lake-Pickle Lake area, districts of Kenora and Thunder Bay
Publication Number: R207 Date: 1982
Author: Sage R.P., Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
Mono - The Geology and Tectonic History of the Central Uchi Subprovince
Publication Number: OFR5952 Date: 1996
Author: Stott G.M.
Publisher Name: Ontario Geological Survey
Location:
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