Ontario Geological Survey
Permanent Link to this Record:
MDI000000000495
| Record Name(s) | Subgrid A - Area 2 - 1988 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2008-Mar-12 |
| Date Last Modified | 2022-Jun-07 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Neawagank Lake Area
Latitude: 52° 27' 4.02" Longitude: -89° 54' 39.34"
UTM Zone: 16 Easting: 302200.003 Northing: 5815199.998 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53A05NW
Point Location Description: Assessment file maps and ddh database.
Location Method: Data Compilation
1987-89: Geological mapping and diamond drilling by Power Explorations and Santa Maria Resources. 1996: Geological mapping and prospecting by Placer Dome Canada.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.16679 | 53A05NW0003 | 53A05NW0003 |
| 2.12764 | 53A05NW0004 | 53A05NW0004 |
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 |
|---|---|---|---|---|
| Terrigenous-Clastic-Unsubdivided | 2 | Adjacent | ||
| Mafic lava flow-unsubdivided | 3 | Near | ||
| Porphyry-unsubdivided | 4 | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Pyrrhotite | Economic | Ore | ||||
| 4 | Gold | Economic | Ore | ||||
| 5 | Arsenopyrite | Economic | Ore | ||||
| 6 | Sphalerite | Economic | Ore | ||||
| Tourmaline | Alteration | Tourmalinization | 1 | ||||
| Grunerite | Alteration | 2 |
Mar 12, 2008 (Mark Puumala) - Burk (1988) indicated that this gold occurrence is hosted in a metasedimentary rock-dominated sequence consisting of interbedded mudstone and garnetiferous oxide facies iron formation. The iron formation comprises approximately 60% of this sequence and consists of an almandine garnet-magnetite-grunerite-chert assemblage. In the area of the occurrence, magnetite has been almost completely replaced by grunerite and secondary iron formation sulphidization (2 to 10%) consisting of pyrrhotite, pyrite, arsenopyrite, chalcopyrite and sphalerite has been noted. Quartz-feldspar porphyry has been noted to the south, east and north of the mineralized metasedimentary rock unit by Burk (1988). The most notable assay from this zone (0.37 oz/ton Au over 1.5 m) is reported by Burk (1988) to have been obtained from a section of diamond drill hole NK-87-07 that contained a 0.25 m wide quartz-tourmaline vein containing visible gold. The visible gold was reported to have an intimate association with fine-grained tourmaline. Anomalous gold assays were also reported from the iron formation immediately adjacent to the quartz vein, resulting in an average value of 0.13 oz/ton Au over 4.5 m (Burk 1988). Occurrence-grade gold assays of up to 0.045 oz/ton were also reported from diamond drill holes NK-87-15 and 29 (Burk 1988) and NK-88-4 (Timoshenko and Corkery 1989). This occurrence is located immediately northwest of the Subgrid A - Area 1 prospect, but is shown to be separated from it by a northeast-striking fault on a geological compilation map prepared by Talbot (1996). Burk (1988) suggested that the anomalous gold values are concentrated within a zone that trends at approximately 315 degrees azimuth. This is approximately parallel to the axial plane of a fold interpreted to occur in the area on the geological compilation map of Talbot (1996).
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
| 2 | Vein |
File - Resident Geologist files: Report on diamond drilling, Neawagank Lake property for Power Explorations Inc.
Publication Number: AFTB53A05NW0030 Date:
Author: Burk, C.P. 1988.
Publisher Name:
Location: Thunder Bay RGP donated files
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