Ontario Geological Survey
Permanent Link to this Record:
MDI52H01NE00004
| Record Name(s) | Swanson Beryl - 1957 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1983-Mar-04 |
| Date Last Modified | 2023-May-23 |
| Created By | |
| Revised By |
Primary Commodities: Beryllium
Township or Area: Hanson Lake Area
Latitude: 49° 13' 15.41" Longitude: -88° 0' 55.53"
UTM Zone: 16 Easting: 426059 Northing: 5452514 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42E04NW, 52H01NE
Point Location Description: 'Be' showing on OGS map M2056 south of Jackfish River and west of Cosgrave Lake
Location Method: Data Compilation
1957: F. Swanson discovered the showing and staked the property. Goldale Mines Ltd. optioned the property and a 15-foot long channel sample weighing 225 pounds was taken across the southeast side of the dike.
Province: Superior
Subprovince: Quetico
Geological Age: Precambrian
May 23, 2023 (Therese Pettigrew) - The bedrock of the area is of Precambrian age. The oldest Archean rocks are metasediments; these strike east-northeast, dip steeply to the north, and are overlain by metavolcanics. The metasediments were intruded by large masses of Algoman granitic rocks, numerous sills and dikes, pegmatite and aplite. Small stock-like masses and narrow dikes of basic rocks also cut the metasediments. Pegmatites are common in the area, they occur close to and within large masses of granitic rock. The pegmatites occur as irregular-shaped bodies and as thin dikes, sills and attenuated lenses. They show regional zoning and a genetic association of pegmatites and granite is indicated (Vos et al., 1982).
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 |
|---|
May 23, 2023 (Therese Pettigrew) - The showing is exposed along the west side of a shallow north-trending valley. "It is a sill that strikes N60E and dips vertically to steeply northwest. It is exposed for a length of about 40 feet. It is 35 feet wide at one point; northeast of this point it splits into two parallel branches, one 10 feet wide, the other 3-5 feet wide, separated by about 20 feet of metasediments." (Pye 1965, p.103).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Beryl | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Muscovite | Economic | Gangue | ||||
| 3 | Tourmaline | Economic | Gangue |
May 23, 2023 (Therese Pettigrew) - "The sill is made up of potash and plagioclase feldspars, quartz, muscovite, beryl and accessory tourmaline, forming an equigranular, fine- to coarse-grained rock devoid of any preferred orientation. The beryl present occurs as greenish yellow, well-formed, hexogonal crystals up to 7 inches in length. It is not abundant, and some of it has been altered to huhnerkobelite and small amounts of muscovite and apatite." (Pye 1965, p.103). The sample taken in 1957 assayed 2.58 percent beryllium (Vos et al., 1982). A small amount of the mineral huhnerkobelite, identified by spectrographic analysis and x-ray powder photography by the Laboratory Branch of the Ontario Department of Mines, was found in the Swanson beryl pegmatites west of Cosgrave Lake. The mineral is very fine-grained and dark green, and occurs as small, irregular-shaped, allotriomorphic aggregates either intimately intergrown with feldspar and quartz or associated with beryl (Pye, 1965).
Map - Georgia Lake area, Thunder Bay District
Publication Number: M2056 Scale: 1:63,360 Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology and lithium deposits of Georgia Lake area, District of Thunder Bay
Publication Number: R031 Page: 103 Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Industrial minerals of northern Ontario-supplement 1
Publication Number: OFR5388 Page: 160 Date: 1982
Author: Vos M.A., Abolins T., Smith V.
Publisher Name: Ontario Geological Survey
Location:
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