Ontario Geological Survey
Permanent Link to this Record:
MDI31M05SE00149
| Record Name(s) | Brady Claim - 1904, Brady Cross Lake Silver Mines Ltd. - 1945, Preston East Dome Mines Ltd. - 1950 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1980-Nov-04 |
| Date Last Modified | 2023-Aug-23 |
| Created By | |
| Revised By |
Primary Commodities: Silver
Township or Area: Coleman, Lorrain
Latitude: 47° 22' 15.78" Longitude: -79° 38' 4.12"
UTM Zone: 17 Easting: 603093 Northing: 5247303 UTM Datum: NAD83
Resident Geologist District: Kirkland Lake
NTS Grid: 31M05SE
Point Location Description: Trench
Location Method: AMIS Site Visit
Province: Southern
Subprovince: Cobalt Basin
Supergroup: Huronian Supergroup
Formation Group: Cobalt Group
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Olivine Gabbro | 1 | Olivine | Host |
|---|---|---|---|---|
| Sandstone | 2 | Greywacke | Adjacent | |
| Felsic lava flow-unsubdivided | 3 | Footwall | ||
| Vein | 4 | Quartz | Footwall |
Aug 01, 2017 (A Wilson) - Nipissing diabase less than 500 ft. thick and dipping 25º ESE overlies 100-150 ft. of Cobalt Series greywacke. The Cobalt greywacke occupies the south-west end of a north-east trending paleo-valley underlain by steeply dipping Keewatin rhyolite. The Cross Lake olivine diabase dike (Keweenawan age) 50 ft. in width strikes south-east across the claim and dips 75º NE. Two branches of the Cross Lake Fault cross the claim one striking SE and the other SSE.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 3 | Silver | Economic | Ore | ||||
| 1 | Chalcopyrite | Economic | Gangue |
Aug 01, 2017 (A Wilson) - Of the several small (up to 1 inch wide) discontinuous veins striking in different directions possibly a few with strikes about N65ºW, are more marked. The vein structures are weak and appear to be mere joints. The gangue is quartz and calcite and contains a little chalcopyrite. The showing was regarded as indicative of a northwest-striking zone of veins, not as a single mineralized vein, to be traced downward to what was hoped would prove to be a productive horizon in the vicinity of the lower diabase contact. The drilling showed the presence of numerous small calcite veinlets but apparently no silver or cobalt mineralization was definitely seen in the core; a number of low (less than 10 oz, per ton) assays were obtained and in drillhole No. 1 from a sample between footages 239.2 and 239.7; an assay of 16.8 oz. silver per ton was reported by Hart. Northwest striking calcite veins with silver and cobalt mineralization. The best assay was 175 g/t Ag over 0.91 inches in DH#1.
| Rank | Characteristic |
|---|---|
| 1 | Vein |
File - Resident Geologist file CO-0580
Publication Number: Date:
Author:
Publisher Name:
Location: Kirkland Lake RGP office
Map - Cobalt silver area, southeastern sheet, Timiskaming District
Publication Number: M2052 Scale: 1:12,000 Date: 1997
Author: Thomson R.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Silver cobalt calcite vein deposits of Ontario
Publication Number: MDC010 Page: 235 Date: 1968
Author: Sergiades A.O.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Preliminary report on the geology of the north part of Lorrain Township (concessions 7 to 12), District of Timiskaming
Publication Number: PR1960-01 Page: 44-50 Date: 1998
Author: Thomson R.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Preliminary report on parts of Coleman Township, concession 4, lots 1 to 5, and Gillies Limit, the eastern "A" claims, District of Timiskaming
Publication Number: PR1961-06 Page: 16-18 Date: 1998
Author: Thomson R.
Publisher Name: Ontario Dept. of Mines
Location:
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