Ontario Geological Survey
Permanent Link to this Record:
MDI53B08NE00010
| Record Name(s) | Forester Lake - Pond Zone - 1995, Esso DDH Fo88-2 - 1995 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1995-May-24 |
| Date Last Modified | 2022-Jun-06 |
| Created By | |
| Revised By |
Primary Commodities: Zinc
Township or Area: Forester Lake Area
Latitude: 52° 28' 59.21" Longitude: -90° 5' 56.23"
UTM Zone: 15 Easting: 696985.783 Northing: 5818730.734 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53B08NE
Point Location Description: Transfer
Location Method: Conversion from MDI
1987-88: Geological and geophysical surveys and diamond drilling by Esso Minerals of Canada.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.12011 | 53B08NE0001 | 53B08NE0001 |
Province: Superior
Subprovince: Berens River
Terrane: North Caribou
Domain: North Caribou Core
Belt: North Caribou
Geological Age: Mesoarchean
| Rock Type | Rank | Composition | Texture | Relationship | Oxide Ironstone | 1 | Oxide Facies | Host |
|---|---|---|---|---|
| Terrigenous-Clastic-Unsubdivided | 2 | Adjacent | ||
| Mafic lava flow-unsubdivided | 3 | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Sphalerite | Economic | Ore | ||||
| 4 | Arsenopyrite | Economic | Ore | ||||
| 5 | Magnetite | Economic | Ore | ||||
| Grunerite | Alteration | 1 |
Mar 13, 2008 (Mark Puumala) - This showing is based on the reported occurrence of anomalous zinc mineralization (6700 ppm over 0.29 m) in Esso Minerals Canada diamond drill hole FO88-2 (Hall 1988). The zinc mineralized horizon is a quartz magnetite iron formation containing minor disseminated pyrrhotite. The anomalous assay was obtained immediately adjacent to a 0.28 m wide quartz vein that was mineralized with 5% arsenopyrite, 3% pyrrhotite and up to 1% chalcopyrite. According to mapping by Hall (1988), the mineralized iron formation is hosted within a mafic metavolcanic rock-dominated sequence. However, diamond drilling results indicate that the iron formation is bounded immediately to the south by a clastic metasedimentary horizon comprised of wacke, argillite and mudstone (Hall 1988). Stratigraphy in the area strikes east, and the occurrence is interpreted to occur on the northern limb of an east-trending antiform structure. Hall (1988) reported that Esso Minerals Canada diamond drill hole FO88-7, located approximately 1 km east of drill hole FO88-2, encountered a 19 m thick sphalerite-bearing quartz-magnetite-garnet-biotite-hornblende iron formation. This iron formation horizon was reported to have contained 1 to 2% disseminated pyrrhotite and less than 1% sphalerite. Hall (1988) reported average zinc assays of 812 ppm over a 24 m section of this drill hole. A higher-grade section of the mineralized zone measuring 9.14 m contained an average of 1616 ppm Zn. An anomalous zinc assay of 1200 ppm over 0.79 m was also reported by Hall (1988) in sphalerite mineralized iron formation encountered 600 m further east in drill hole FO88-6. The sphalerite mineralized iron formation horizons reported in drill holes FO88-6 and 7 are located along strike with the iron formation-hosted zinc occurrence at drill hole FO88-2. Therefore, these occurrences may be part of a single zinc-mineralized zone.
| Rank | Classification |
|---|---|
| 1 | VMS Base Metal |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
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