Ontario Geological Survey
Permanent Link to this Record:
MDI52E06NE00002
| Record Name(s) | Popham-Byberg - 1936, Magnet Point - 1936, Popham-Olsen - 1936 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1980-Jun-30 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Moosin Bay Area, Snowshoe Bay Area
Latitude: 49° 29' 56.15" Longitude: -95° 7' 54.47"
UTM Zone: 15 Easting: 345644 Northing: 5485106 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52E06NE, 52E11SE
Point Location Description: Precise
Location Method: Conversion from MDI
Access Description: The site is located southwest of Magnet Point on Shoal Lake, 19 km southwest of Clytie Bay Landing. It may be reached by boat from Clytie Bay Landing, or from Kenora via Ash Rapids.
Prior to 1936: trenching by persons unknown. 1936: Magnet Point Syndicate carried out trenching and drilled 4 x-ray holes. 1950: drilled 2 DDH. 1961: J. Brown carried out prospecting and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.5560 | 52E11SE8459 | 52E11SE8459 |
Province: Superior
Subprovince: Wabigoon
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Basalt | Adjacent |
|---|---|---|---|---|
| Quartz-Rich Granitoid | 2 | Adjacent | ||
| Mylonite/Fault Gouge/Pseudotachylite | 3 | Shear Zone | Contains | |
| Vein | 4 | Contains |
May 15, 2020 (Therese Pettigrew) - Rocks exposed at Magnet Point are fine- to medium-grained, northeast-trending, east-facing, mafic metavolcanic flows, and conformable gabbroic sills, which may be, at least in part, coarser mafic flows. In the first bay southwest of Magnet Point, two quartz porphyry dykes are exposed. There, the rocks are predominantly mafic and include fine-grained basalt, porphyritic basalt with 1 cm feldspar phenocrysts, and dark, fragmental basalt. Magnet Point lies along a zone of significant movement, and all the rocks have a well-developed, northeast-trending (035-045 degree) foliation. Some outcrops display a series of branching shears, locally intersecting at high angles. The quartz porphyry outcrops are highly pyritiferous and display considerable shearing. The contacts are sharp and appear intrusive; however, there is additional later shearing which masks the relationship. In contact with the porphyry is a dioritic rock, which resembles the Stevens Island diorite (Davies and Smith, 1988).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Gold | Economic | Ore | ||||
| 3 | Galena | Economic | Ore |
May 15, 2020 (Therese Pettigrew) - According to Thomson (1947), gold occurs in two structural settings: (1) light coloured dikes, and (2) shear zones. Gold-bearing, thin quartz veins and veinlets characterize both settings. In the main showing, a 10 to 25 ft wide, northeast-trending, quartz porphyry dike is charged with pyrite, and appears conformable to stratigraphy. The dike is intersected, near its northern end, by a north-northeast-trending shear zone, characterized by abundant pyrite, pervasive silicification and sericitization, and locally by weak carbonatization. Quartz is sugary textured and contains finely disseminated, cubic pyrite. Visible gold was reported by Thomson. Mineralization within the silicified shear zone varies locally. In areas where silicification is less intense, wisps of magnetite parallel the foliation within sericite schist. Elsewhere, biotite is visible as flakes (<2 mm) which parallel the foliation and are associated with finely disseminated cubes of pyrite. Pyrite and magnetite seem mutually exclusive. The presence of galena was reported by Byberg (1938). A few assays were reported as high as 1.12 oz Au/ton; however, most assays are between trace and 0.1 oz Au/ton over intervals varying from several inches to 5 ft. Samples of mineralized felsite and quartz, taken during the 1988 OGS study from the northern end of the occurrence, averaged 3150 ppb Au and 330 ppb Au, respectively (Davies and Smith, 1988). Grab sample 933 collected in 1961 returned 0.052 oz/t Au (1.78 g/t Au) (Assessment report 52E11SE8459).
Book - Note on Popham-Byberg Gold Occurrence, Magnet Point, Shoal Lake; Unpublished report of resident geologist, Kenora
Publication Number: Note Date: 1947
Author: Thomson, R.
Publisher Name: Ontario Geological Survey
Location:
Mono - Gold deposits of the Kenora-Fort Frances area, districts of Kenora and Rainy River
Publication Number: MDC016 Page: 33 Date: 1976
Author: Beard R.C., Garratt G.L.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Geology of the Shoal Lake-Western Peninsula area, District of Kenora
Publication Number: OFR5242 Page: 101-102 Date: 1978
Author: Davies J.C.
Publisher Name: Ontario Geological Survey
Location:
Article - Geology of the Northwest Angle Inlet area, Lake of the Woods, District of Kenora
Publication Number: MP132.008 Date: 1997
Author: Morrice M.G.
Publisher Name: Ontario Geological Survey
Location:
Mono - The geological setting of gold occurrences in the Lake of the Woods area
Publication Number: OFR5695 Page: 205-207 Date: 1988
Author: Davies J.C., Smith P.M.
Publisher Name: Ontario Geological Survey
Location:
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