Ontario Geological Survey
Permanent Link to this Record:
MDI000000003449
| Record Name(s) | Nym Lake Pegmatites - 2022 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2023-Jun-22 |
| Date Last Modified | 2023-Jun-22 |
| Created By | |
| Revised By |
Primary Commodities: Rubidium
Secondary Commodities: Lithium, Tantalum, Niobium, Cesium
Township or Area: Pickerel Lake Area
Latitude: 48° 41' 40.47" Longitude: -91° 25' 53.3"
UTM Zone: 15 Easting: 615424 Northing: 5394691 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52B11NW
Point Location Description: Samples from Assessment report 20000020766
Location Method: Data Compilation
2022: S. Dolega carried out prospecting and sampling for a. Onchulenko.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 5227 | 20000020766 | 20000020766 |
Province: Superior
Subprovince: Quetico
Geological Age: Archean
Jun 22, 2023 (Therese Pettigrew) - The Nym Lake Property is situated within the Quetico subprovince of the Superior Province. The Quetico subprovince is predominately a metasedimentary belt, with localized migmatite and granite, metamorphosed from lower greenschist to upper amphibolite facies with localized granulite facies metamorphism (e.g. Percival et al. 2012). It is bounded to the north by the Marmion Terrane, separated by the Quetico Fault and bounded to the south by the Wawa-Abitibi Terrane (Percival et al., 2012) Both the Marmion and Wawa-Abitibi terranes are granite-greenstone belts (Percival et al., 2012).
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Host |
|---|---|---|---|---|
| Granite | 2 |
Jun 22, 2023 (Therese Pettigrew) - The Nym Lake Property is mostly composed of metasedimentary turbiditic sequences, with abundant felsic pegmatitic intrusive rocks and the Nym Lake Intrusion (Duess, 2002). The turbidite sequences are composed of well banded mudstone and siltstone and the felsic intrusive rocks are white to light grey feldspar rich pegmatites (Duess, 2002). The Nym Lake intrusion is a medium- to coarsegrained, hornblende-rich gabbro to peridotite and pyroxenite (Duess, 2002). PGE mineralization is restricted to ultramafic units and sulphide-magnetite bearing mafic phases that contain pyrrhotite and chalcopyrite (Kuzmich, 2013).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Muscovite | Economic | Gangue | ||||
| 2 | Feldspar | Economic | Gangue | ||||
| 3 | Tourmaline | Economic | Gangue |
Jun 22, 2023 (Therese Pettigrew) - Four types of samples were collected during the 2022 program: bulk K-feldspar samples, bulk muscovite samples, pegmatite samples and a gabbro. Bulk K-feldspar and bulk muscovite samples were samples of just K-feldspar and muscovite, respectively of the granite pegmatite. A total for 10 samples were collected. 4 samples were taken of granite pegmatite, 3 samples were taken of just bulk K-feldspar from granite pegmatites, 2 samples were taken of just bulk muscovite from granite pegmatites and 1 sample was taken of gabbro. 3 samples (2 bulk muscovite and a pegmatite sample) yielded anomalous (>100 ppm) Li assays, including a bulk muscovite sample with 520 ppm Li. Note that the gabbro has elevated lithium values of 64 ppm Li. The same 3 samples yielded anomalous (>50 ppm) Cs assays, including a bulk muscovite sample of 161 ppm Cs. Anomalous (>50 ppm) Ta were only observed in the bulk muscovite samples, with the highest Ta assay of 80.7 ppm. The two bulk muscovite samples also have high Nb content, 285.7 ppm and 302.8 ppm. Sample B418737 (bulk muscovite) returned 1680 ppm Rb, 294 ppm Li, 58.2 ppm Cs, 50.7 ppm Ta, and 302.8 ppm Nb. Sample B418738 (bulk k-feldspar) returned 1480 ppm Rb, <15 ppm Li, 40.7 ppm Cs, and 0.9 ppm Ta. Sample B418744 (bulk muscovite) returned 1580 ppm Rb, 520 ppm Li, 151 ppm Cs, 80.7 ppm Ta, and 285.7 ppm Nb (Assessment report 20000020766).
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office