Ontario Geological Survey
Permanent Link to this Record:
MDI000000002372
| Record Name(s) | North Mawn Lake - 2019 |
|---|---|
| Related Record Type | |
| Record Status | Occurrence |
| Date Created | 2020-Jan-28 |
| Date Last Modified | 2021-Dec-14 |
| Created By | Therese Pettigrew |
| Revised By | Therese Pettigrew |
Primary Commodities: Vanadium
Township or Area: Allely Lake Area
Latitude: 49° 35' 6.4" Longitude: -90° 24' 10.9"
UTM Zone: 15 Easting: 687704 Northing: 5495743 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52G09SW
Point Location Description: Sample MP19WPT403 from Puumala, 2020, p. 61
Location Method: Data Compilation
Access Description: The field area was accessed by travelling approximately 69 km north (from Highway 17) along Graham Road to the intersection with Moberly Road, and then travelling west along Moberly Road for approximately 3 km. From here, outcrop exposures were examined along Moberly Road and on a secondary logging road that extends for approximately 1 km to the south.
2019: Sampling by OGS staff.
Province: Superior
Subprovince: Wabigoon
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Gabbro | 1 | Host |
|---|---|---|---|---|
| Quartz Diorite | 2 | Near |
Jan 28, 2020 (Therese Pettigrew) - Most of the outcrops that were observed on the secondary logging road were dominated by coarse-grained, magnetite-rich quartz diorite and tonalite. In places, these rocks are intruded by irregular bodies of amphibole-bearing pegmatite. These tonalitic to gabbroic pegmatites display wide variability in their relative proportions of felsic minerals to amphibole, although most are leucocratic. The quartz diorite is also cross-cut by numerous granitic dikes that are often garnet bearing and appear to be the latest intrusions. Sample MP19WPT403 is described as a gabbro with moderately magnetic groundmass, massive magnetite lenses 1 cm wide and 3-4 cm long, 1% disseminated very fine-grained sulphides (Puumala, 2020).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Magnetite | Economic | Ore |
Jan 28, 2020 (Therese Pettigrew) - Rock samples were collected for geochemical analyses at 5 locations where the lithology appeared likely to be related to the Roaring River Complex. One of the goals of this sampling was to determine if anomalous vanadium concentrations are present in any of the magnetite-rich rocks. The most notable geochemical results were obtained from sample MP19WPT403. This sample of gabbroic rock contained xenoliths of massive magnetite and returned an elevated vanadium value of 708 ppm (equivalent to 1264 ppm V2O5), along with Fe2O3 and TiO2 values of 21.82% and 2.9%, respectively. This result, along with the field observation of layered, magnetite-rich gabbro in outcrop reinforce the prospectivity of the Allely Lake area for the discovery of massive Fe-Ti-V oxide mineralization (Puumala, 2020).
Publication - Fe-Ti-V Potential in the Roaring River Complex near Allely Lake; in Ontario Geological Survey, Resident Geologist Program, Recommendations for Exploration 2019–2020, p.59-63
Publication Number: RFE 2019-20 Scale: Date: 2020
Author: Puumala, M.A.
Publisher Name: Ontario Geological Survey
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