Ontario Geological Survey
Permanent Link to this Record:
MDI000000000524
| Record Name(s) | Four Square - 1987 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2008-Mar-19 |
| Date Last Modified | 2022-Jun-07 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: North Caribou Lake Area
Latitude: 52° 48' 56.94" Longitude: -90° 30' 17.34"
UTM Zone: 15 Easting: 668149.999 Northing: 5854699.995 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53B15SE
Point Location Description: Assessment file map.
Location Method: Data Compilation
1982: Geochemical survey by Cominco Ltd. 1987: Geophysical surveys, geological mapping, prospecting and trenching by Power Explorations Inc.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.10583 | 53B16SW0001 | 53B16SW0001 |
Province: Superior
Subprovince: Berens River
Terrane: North Caribou
Domain: North Caribou Core
Belt: North Caribou
Geological Age: Mesoarchean
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Adjacent | ||
| Terrigenous-Clastic-Unsubdivided | 3 | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Sulphides | Economic | Ore |
Mar 19, 2008 (Mark Puumala) - Newman (1987) indicated that this occurrence is hosted in a large outcrop exposure of moderately-deformed, heavily-gossaned banded iron formation. The mineralized iron formation is hosted in a mafic metavolcanic rock-dominated sequence that has been assigned to the South Rim unit of the McGruer assemblage by Thurston, Osmani and Stone (1991). Clastic metasedimentary rocks of the Eyapamikama assemblage have been mapped by Newman (1987) approximately 150 m to the east of the occurrence. The most significant assay obtained from this zone was a grab sample result of 790 ppb Au from a gossan zone oriented parallel to an axial planar fracture cleavage in an area of intense folding (Newman 1987). The axial planar cleavage at this location strikes approximately 330, oblique to the general trend of stratigraphic layering, which strikes 350. Regionally, stratigraphy and foliation are subparallel, with an average strike of 325 and steep westerly dips ranging from 75 to 85 degrees (Newman 1987).
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
Article - Northwestern Superior province: review and terrane analysis
Publication Number: SV04-01.005 Date: 1997
Author: Thurston P.C., Osmani I.A., Stone D.
Publisher Name: Ontario Geological Survey
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office