Ontario Geological Survey
Permanent Link to this Record:
MDI41O04SW00024
| Record Name(s) | Brennan Occurrence - 1967 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Sep-01 |
| Date Last Modified | 2023-Aug-25 |
| Created By | |
| Revised By |
Primary Commodities: Zinc
Secondary Commodities: Silver, Copper, Lead
Township or Area: Gapp
Latitude: 47° 5' 56.18" Longitude: -83° 51' 16.22"
UTM Zone: 17 Easting: 283392 Northing: 5220113 UTM Datum: NAD83
Resident Geologist District: Sault Ste. Marie
NTS Grid: 41O04SW
Point Location Description: trenches
Location Method: AMIS Site Visit
Access Description: Highway 17 north from Sault Ste. Marie. Take Highway 556 past Belleview. Take Highway 532 (continues on at approximately 13km beyond Belleview) to Searchmont and turn right after crossing the Goulais River. Travel 21km to a "T" intersection. Turn left and travel 1.5km. Turn right and travel 1km. Walk up old overgrown logging road to the left.
In 1967, L.T. Brennan of Toronto, prospecting on behalf of J. Hamilton of Toronto, made a discovery of lead-zinc-silver-copper mineralization in Gapp township. The claims were acquired by World Mining Explorations Limited and an associated company, Victoria Algoma Mineral Company Limited. 1975: HBOG Mining Ltd. - airborne EM survey. 1990: Noranda Exploration Company Limited - magnetometer and HLEM surveys. From the 1980's to late 1990's a significant amount of exploration work was conducted in the areas surrounding the Brennan occurrence by Wolverine Resources and Noranda Exploration Ltd. This work included prospecting, mapping, geophysical surveys, trenching, diamond drilling, humus sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| Gapp -0015A1/ 41N01NE0026 | 20000004797 | 20000004797 |
| 2.13599 | 41O04SE0002 | 41O04SE0002 |
Province: Superior
Subprovince: Abitibi
Terrane: Wawa-Abitibi
Belt: Batchawana
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Schist-Unsubdivided | 1 | Silicified-Chloritic | Host |
|---|---|---|---|---|
| Terrigenous-Clastic-Unsubdivided | 2 | Graphitic | Host | |
| Vein | 3 | Quartz | Contains |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Galena | Economic | Ore | ||||
| 4 | Sphalerite | Economic | Ore | ||||
| 6 | Chalcopyrite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 6 | Graphite | Economic | Gangue |
Jan 26, 2016 (A Pace) - The mineralization occurs in several zones, varying in width up to 10m and approximately 0.5 km in length which are parallel to the regional foliation of N50W and dip vertically. Pyrite, pyrrhotite, galena, sphalerite and chalcopyrite occur in quartz veins within cherty and graphitic interflow metasediments within the felsic metavolcanics. A grab sample containing massive galena was submitted for assay and gave values of 0.034% copper, 1.4% zinc, and lead. This sample was collected by the Ontario Geological Survey in 1980. The quartz veins have intruded and brecciated the dark grey cherty siltstone and sulphide iron formation. The mineralization occurs as massive areas and disseminations in the quartz veins. Noranda Exploration Ltd. had collected a grab sample from the Brennan occurrence consisting of quartz vein-associated base metals mineralization hosted by cherty and graphitic interflow sediments within felsic metavolcanics. Several grab samples returned up to 3.2% zinc, 0.0835% copper, 0.0645% lead and 1.8 g/ton silver and the quartz veins appear to strike sub-parallel to stratigraphy.
| Rank | Classification |
|---|---|
| 1 | Exhalative |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
| 2 | Vein |
Article - Sudbury District
Publication Number: MP017.002 Page: 7-9 Date: 1997
Author: Donovan J.F.
Publisher Name: Ontario Dept. of Mines
Location:
File - Resident Geologist files Gapp-0013-B1
Publication Number: Date:
Author:
Publisher Name:
Location: SSM RGP office
Map - Cowie Lake, Algoma District
Publication Number: M2426 Scale: 1:31,680 Date: 1979
Author: Grunsky E.C.
Publisher Name: Ontario Geological Survey
Location:
Map - Geological series, Cowie Lake area, District of Algoma
Publication Number: P1562 Scale: 1:15,840 Date: 1978
Author: Grunsky E.C., Arengi J.T.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of the Cowie Lake area, District of Algoma
Publication Number: R192 Page: 56-57 Date: 1980
Author: Grunsky E.C.
Publisher Name: Ontario Geological Survey
Location:
Map - Geological compilation series, Batchawana sheet, districts of Algoma and Sudbury, Sault Ste. Marie Mining Division
Publication Number: P0302 Scale: 1:126,720 Date: 1997
Author: Giblin P.E., Leahy E.J.
Publisher Name: Ontario Geological Survey
Location:
Mono - Geology of the Cowie Lake area, District of Algoma
Publication Number: OFR5246 Page: 70-71 Date: 1978
Author: Grunsky E.C.
Publisher Name: Ontario Geological Survey
Location:
Map - Geological series, Precambrian geology, Batchawana synoptic project, Welcome Lake-Ranger Lake sheet, districts of Algoma and Sudbury
Publication Number: P3064 Scale: 1:50,000 Date: 1987
Author: Grunsky E.C.
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 Sault Ste. Marie Resident Geologist District Office