Ontario Geological Survey
Permanent Link to this Record:
MDI42E12NW00030
| Record Name(s) | Dominion Vein - 1936, No. 12 Showing - 2007 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Feb-04 |
| Date Last Modified | 2022-Jun-20 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: McComber
Latitude: 49° 37' 36.03" Longitude: -87° 48' 11.81"
UTM Zone: 16 Easting: 441987 Northing: 5497434 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E12NW, 42E12SW
Point Location Description: Precise
Location Method: Conversion from MDI
Access Description: The Gwyn Lake Gold Prospect is located astride the McComber and Vincent townships. Access is via Highway 11 and an old dirt road that branches off the highway about 11 kilometers east of Beardmore. The dirt road runs to the Black Water River, which has to be crossed by boat. The trail then continues for approximately 0.5 kilometer south to join a dirt road, which should be followed for approximately one kilometre to a new trail providing an access to the southern and central portions of the prospect.
1936: Gwyn Beardmore Mines Ltd. conducted prospecting and trenching. 1978: Goldwater Resources conducted a magnetometer survey and sampling. 1980: A. Hopkins conducted a magnetometer survey. 1985: Tenacity Mining Corp. carried out an airborne magnetic and VLF-EM survey. 1986-87: Tenacity Mining Corp. Ltd. carried out stripping and sampling. 1994: Morning Dew Exploration Ltd. carried out prospecting, stripping, and sampling. 2008-10: Ultra Uranium Corp. carried out prospecting, stripping, and sampling. 2014: Ultra Resources Corp. carried out sampling. 2015-17: Ultra renamed to Empire Rock Minerals Inc. and carried out mapping and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.43741 | 20000004436 | 20000004436 |
| 2.46688 | 20000005755 | 20000005755 |
| 2.36767 | 20000002603 | 20000002603 |
| 2.58340 | 20000015352 | 20000015352 |
| 2.3722 | 42E12SW0023 | 42E12SW0023 |
| 2.9929 | 42E12NE0185 | 42E12NE0185 |
| 63.4766 | 42E12NE0183 | 42E12NE0183 |
| 2.15768 | 42E12NE0042 | 42E12NE0042 |
| 2.57452 | 20000013553 | 20000013553 |
| 2.56528 | 20000014091 | 20000014091 |
| 2.55823 | 20000014677 | 20000014677 |
| 2.10747 | 42E12SW0008 | 42E12SW0008 |
| 2.6900 | 42E12NW0010 | 42E12NW0010 |
| 2.3394 | 42E12NW8187 | 42E12NW8187 |
Province: Superior
Subprovince: Wabigoon
Terrane: Eastern Wabigoon
Belt: Beardmore-Geraldton
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz | Host |
|---|---|---|---|---|
| Ironstone-unsubdivided | 2 | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Arsenopyrite | Economic | Ore | ||||
| 2 | Gold | Economic | Ore | ||||
| 3 | Magnetite | Economic | Ore | ||||
| 4 | Pyrite | Economic | Ore |
Aug 02, 2016 (Andrew Tims) - The assays from the Dominion showing collected in 2014 yielded a weighted average of 1.40 g/t gold over an average width 0.78 m. The principal ore minerals are native gold, pyrite, arsenopyrite, magnetite, pyrrhotite, and the subordinate minerals include chalcopyrite, sphalerite, galena, stibnite and rare gold tellurides. A petrographic syudy reported gold inclusions up to a half millimeter in diameter in arsenopyrite from the Ralph Lake showing
Oct 15, 2019 (Therese Pettigrew) - The #12 showing is along strike, about 350 m NW of the Dominion showing, and has a reported weighted average of 1.54 ppm Au over an average width of 0.74 m. The most significant gold mineralization in the area appears to be located within a strip from the Dominion Showing - # 12 showing - Gwyn Lake West - Gwyn Lake - Gwyn Lake East. Combined, it measures about 1,750 meters along strike (Assessment report 20000015352). The Dominion Vein can be traced approximately 750 m and is up to 3 m wide. Ironstone is typically made up of recrystallized chert; minor magnetite and carbonate occur within a shear zone. The shear contains arsenopyrite and has been intruded by a vitreous quartz vein with minor pyrite (Patterson et al., 1984). The strike of the occurrence was about N 70° E and the dip about 80 N. The occurrence had been stripped and 1000 feet (305 m) of drilling was reported carried out by an unknown concern, but the number of holes drilled was not stated. No assays from the drilling were reported but a grab sample taken by Nulac Gold Mines Limited assayed 0.14 ounce gold per ton (Carter, 1987). Sample 177514 returned 0.085 opt Au (2.91 g/t Au) from a crystalline pinkish quartz with silicified mafic volcanics. Sample 177544 returned 0.093 opt Au (3.19 g/t Au) from oxidized sugary banded iron formation mineralized with less than 1% pyrite. Sample 177548 returned 0.273 oz/t (9.36 g/t Au) from a sugary banded iron formation with crystalline quartz mineralized with arsenopyrite and pyrite. Sample 177559 returned 0.383 oz/t (13.13 g/t Au) from a crystalline quartz vein mineralized with 1% chalcopyrite, pyrite, and arsenopyrite. Sample 177572 returned 0.443 oz/t (15.19 g/t Au) from a folded banded iron formation with massive veinlets of arsenopyrite and remnants of a narrow white quartz vein (Assessment report 42E12NE0042).
| Rank | Classification |
|---|---|
| 1 | Vein |
Book - Petrographic examination of polished sections from Gwyn Lake Prospect, Northwest Ontario; Non-published report for Ultra Resources Corp
Publication Number: N/A Date: 2008
Author: Harris J. F.
Publisher Name: Ultra Resources Corp
Location:
Journal - A Structural Reappraisal of the Beardmore– Geraldton Belt at the Southern Boundary of the Wabigoon Subprovince, Ontario, and Implication for Gold Mineralization. Can. J. Earth Sci. 41, p. 217-235.
Publication Number: Vol 41 Date: 2004
Author: Lafrance, B., DeWolfe, J.C. and Stott, G.M.,
Publisher Name: Canadian Journal Of Earth Sciences
Location:
Mono - Report of Activities 2004, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North District
Publication Number: OFR6147 Page: 7 Date: 2005
Author: Smyk M.C., White G.D., Magee M.A., Komar C.L.
Publisher Name: Ontario Geological Survey
Location:
File - Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date: 1996
Author:
Publisher Name:
Location: Thunder Bay RGP
Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane
Publication Number: OFR5630 Page: 497-504 Date: 1986
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
Book - Report on the Gwyn Beardmore Gold Mines Ltd. Property. Unpublished report
Publication Number: RGP Dep files Date: 1938
Author: DeCamps, E.B.E.
Publisher Name:
Location: TBay office RGP Mineral deposit files
Publication - GDIF 42E12NW (unpublished)
Publication Number: GDIF Date: 1988
Author: Ontario Geological Survey
Publisher Name: Ontario Geological Survey
Location:
Article - Thunder Bay Resident Geologist area, North Central Region
Publication Number: MP122.004 Date: 1997
Author: Patterson G.C., Mason J.K., Schnieders B.R.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of McComber and Vincent townships, District of Thunder Bay
Publication Number: OFR5648 Page: 71-72 Date: 1987
Author: Carter M.W.
Publisher Name: Ontario Geological Survey
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office