Ontario Geological Survey
Permanent Link to this Record:
MDI42D14SE00078
| Record Name(s) | Twomey Powerline Occurrence - 9999 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1997-Feb-21 |
| Date Last Modified | 2022-May-06 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Priske
Latitude: 48° 50' 31.5" Longitude: -87° 13' 14.75"
UTM Zone: 16 Easting: 483801.68 Northing: 5409924.8 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D14SE
Point Location Description: Quartz vein along power line.
Location Method: Other Literature
Access Description: The Twomey Powerline Occurrence is located approximately 7 km northeast of Schreiber in Priske Township. Access is available byn 4x4 or all-terrain vehicle via the Cooks Lake road. The occurrence is located approximately 1.5 km east of Big Duck Creek.
1991: T. Twomey discovered the occurrence while prospecting in the Schreiber area. The prospecting program was assisted by an OPAP grant. 1992: Geological mapping and sampling were conducted with the assistance of an OPAP grant. 1995: The property was optioned by RJK Explorations Ltd.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| OP91-002 | 42C16SE0002 | 42C16SE0002 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Dec 07, 2005 (B Nelson) - The area is underlain by mafic metavolcanic rocks, mainly pillowed and massive flows. Oxide an sulphide facies iron formation is intercalated within the metavolcanic rocks. Gabbro and syenite dikes intrude the area. Schnieders et al. (1993) describes the Twomey Powerline as: Prospecting by T. Twomey along the power line approximately 500 m north of the Schreiber Pyramid property resulted in the discovery of gold in quartz veins associated with felsic intrusive dikes within mafic metavolcanic rocks. A quartz vein strikes 106 degrees and dips 70 degreesSW and was traced for over 200 m along the power line. The vein averages 20 to 25 cm in width and displays a crack seal texture. The quartz vein occurs in contact with a pink hornblende syenite dike, which is commonly on the footwall contact of the vein. Several syenite dikes were observed in the area, up to 1 m in width. The quartz vein and syenite dikes are hosted by sheared and deformed pillowed mafic metavolcanic rocks. Extensional, sigmoidal, quartz filled gash veins are present within the metavolcanic host rocks. In 1 section, the main mineralized quartz vein displays a 20x flexure in strike. On the eastern end of the showing, approximately 300 m east of the main mineralized quartz vein, several narrow, mineralized quartz filled gash veins are exposed within syenite dikes.
| Rock Type | Rank | Composition | Texture | Relationship | Syenite | 1 | Hornblende Syenite | Footwall |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Sheared & Pillowed | Host | |
| Vein | 3 | Quartz | Host | |
| Ironstone-unsubdivided | 4 | Near | ||
| Gabbro | 5 | Gabbro | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Tourmaline | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | Unknown | Veins | ||
| Tourmaline | Alteration | Tourmalinization | 2 | Unknown | Disseminated |
Dec 07, 2005 (B Nelson) - Samples collected by the Resident Geologist's Program returned the following results: 92-BTT-5: 0.337 oz/ton Au -- Grab sample from central section of vein; crack-seal quartz vein, minor py, tourmaline and syenite seam. 92-BTT-6: 0.049 oz/ton Au -- Grab sample from western end of vein; minor py, crack-seal texture. 92-BTT-7: Trace Au -- Grab sample from syenite dyke on hanging wall; hornblende-phyric host rock with approximately 1% py. 92-BTT-8: 0.061 oz/ton Au -- Chip sample across 0.6 m at western end of vein; includes host rock.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| 1 | Vein |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
| 1 | Vein |
Date: Feb 21, 1997
Geologist: B Nelson
Notes: Resident Geologist personnel visited the occurrence on August 5, 1992.
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files, Thunder Bay office
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District
Publication Number: M2232 Scale: 1:253,440 Date: 1973
Author: Carter M.W., McIlwaine W.H., Wisbey P.A.
Publisher Name: Ontario Division of Mines
Location:
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Page: 456-458 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
Map - Schreiber area, District of Thunder Bay, Ontario
Publication Number: ARM47J Scale: 1:31,680 Date: 1997
Author: Bartley M.W., Harcourt G.A.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geological series, Precambrian geology of the Terrace Bay area, west sheet, Thunder Bay District
Publication Number: P2417 Scale: 1:15,840 Date: 1981
Author: Carter M.W.
Publisher Name: Ontario Geological Survey
Location:
Compend - Report of Activities 1992, Resident Geologists
Publication Number: MP161 Page: 132 Date: 1993
Author: Fenwick K.G., Pitts A.E., Newsome J.W.
Publisher Name: Ontario Geological Survey
Location:
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