Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52H08NE00013

Record: MDI52H08NE00013

General

Commodities

Primary Commodities: Lithium

Location

Township or Area: Kilkenny

Latitude: 49° 26' 53.56"    Longitude: -88° 2' 12.84"

UTM Zone: 16    Easting: 424842   Northing: 5477800    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52H08NE

Point Location Description: Transfer

Location Method: Data Compilation

Access Description: The Nama Creek property can be accessed by driving 60 km north of the town of Nipigon on Highway 11, then driving approximately 5 km east on a dirt road.

Exploration History

1955: Nama Creek Mines Ltd. completed line cutting, trenching, sampling, and geological mapping. 1955-56: Nama Creek Mines drilled 45 DDH totaling 8789 m. 1956: Nama Creek Mines sank a vertical shaft to 750 ft with five levels at 150 ft intervals. 2010: Rock Tech Lithium Inc. conducted sampling and surveying of historic collars. 2011: Rock Tech drilled 32 DDH totalling 7176.9 m in two drill campaigns and conducted channel sampling (18 channels on Nama Creek Main Zone North). 2012: Rock Tech relogged diabase core and conducted geological mapping. 2021-2022: Rock Tech drilled 46 DDH totalling 13,829 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Quetico

Geological Age: Archean  

Lithology

Lithology Comments

Apr 15, 2016 (Therese Pettigrew) - There is an abundance of pegmatites close to and within the large masses of granitic rocks. A regional zoning is apparent and a genetic association of pegmatites and granite is indicated. The pegmatites occur in two geometries: as irregular-shaped bodies and as thin dykes, sills and attenuated lenses. The irregular bodies of pegmatite are intimately associated with the granite bodies often within a few hundred feet of the contact zone. They typically are medium- to coarse-grained, up to very coarse-grained and are made up of quartz, microcline, perthite and little muscovite. These would be classified as potassic pegmatites. Accessory minerals include biotite, tourmaline and garnet. The pegmatite dykes, sills and lenses can be subdivided into rare-element pegmatites and granitic pegmatites. The rare-element pegmatites are of economic significance and they contain microcline or perthite, albite, quartz, muscovite and spodumene and minor amounts of beryl, columbite-tantalite and cassiterite. The granitic pegmatites are similar to the irregular pegmatites described above except that they contain more abundant plagioclase. Some of the pegmatites are parallel to the foliation or bedding of the metasediments, whereas others occur in joints in either the metasediments or granite. Contacts are usually sharp and, except where dykes cut granitic rocks, often found to be marked by a thin border zone of aplite or granitoid composition. A few pegmatites are internally zoned with mica-rich or tourmaline-rich rock along or close to the walls and quartz cores. The Nama Creek property contains five pegmatite dykes: 1) Main Zone/North (MZN), 2) Main Zone/Southwest (MZSW), (3) South Zone/West Dyke 1/ Harricana, (4) Southeast Zone/ Line 60 and (5) Caral dyke (Figure 6-1 and Figure 7-4). The Nama Creek property is underlain by thickly bedded biotite gneiss/schist and quartz-rich biotite gneiss/schist. Generally the metasediments strike uniformly northeast and dip 50-85 degrees NW. Several diabase dykes, with widths up to 100 ft (=30.5 m), cut sharply across the metasediments and the pegmatites. A wide fault zone is thought to exist under a linear valley extending north from Downey Lake. Although the relative displacement is not known, it is apparent that the fault has cut several of the lithium-bearing pegmatites and is responsible for the abrupt terminations of them. The metasedimentary rock hosting the MZN pegmatite dykes is typically fine grained, medium gray in color, massive to schistose (typically the rock is massive to weakly foliated), and is composed of quartz, feldspar, and biotite. Occasionally, there is trace pyrite and other sulfide minerals in the metasedimentary rocks. Natural fractures/joints cutting the metasediment will often have trace amounts of pyrite (found in slightly more abundant quantities than what is normally present), calcite, and chlorite. Less commonly, epidote, hematite, and quartz can be found in the fractures. Sometimes, the metasediment will show evidence of patchy, localized alteration which is usually associated with an increase of what appears to be feldspar and quartz accompanied by cordierite and rarely pyrite and garnet (Selway et al, 2012).

Mineralization

Mineralization Comments

Apr 15, 2016 (Therese Pettigrew) - The major minerals in the pegmatite are quartz, alkali feldspar, muscovite and spodumene (up to 5 inches in length). The lithium is contained mainly in spodumene with minor amounts in muscovite. The spodumene content of the pegmatite is up to 30 vol.%, and is the highest in the widest dykes. The amount of spodumene is up to 25 vol.% in the Main Zone. Samples were assayed for Li and the highest Li content is 1.97 wt. % Li2O over 1.5 m from hole NC-05. The highest amounts of Li occur in spodumene pegmatite. The best assay results from the 2011 channel sampling on the MZN include 1.71 % Li2O over 6.74 m from NC-CH-11-11; 1.19 % Li2O over 5.20 m from NC-CH-11-04; and 1.26 % Li2O over 5.20 m from NC-CH-11-10A. The pegmatite in NC-CH-11-11 is coarse- to very coarse-grained with a 4 cm wide aplite dyke. The pale green spodumene in the pegmatite comprises 15 vol% which is randomly oriented, unaltered and 1 to 5 cm long. The pegmatite in NC-CH-11-04 contains 10 vol% pale green spodumene which is up to 5 cm long. The pegmatite in NC-CH-11-10A contains 10 vol% pale green spodumene which ranges from 1 to 10 cm long and is unaltered (Selway et al, 2012). The MZN deposit contains multiple stacked pegmatite dikes that are grouped into the "Northern" and "Southern" pegmatite systems at MZN. Spodumene mineralization at MZN strikes at 235 degrees for over 1 km and dips 60 degrees to the northwest. At MZN, the 2021-22 drill program extended spodumene mineralization for 50 – 100 m down dip of known pegmatites for about 300 m along strike on the eastern side of the deposit. DDH NC-21-16 returned 1.09% Li2O over 11.4 m (true width) starting at 284.1m. DDH NC-21-20 returned 1.37% Li2O over 13.2m (true width) starting at 195.5 m. DDH NC-22-02 returned 1.17% Li2O over 9.0m (true width) starting at 284.4 m (Rock Tech news release June 30, 2022).

Mineral Record Details

References

Map - Georgia Lake area, Thunder Bay District

Publication Number: M2056 Scale: 1:63,360    Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - Preliminary Economic Assessment for an Integrated Lithium Hydroxide Operation from the Georgia Lake Lithium Project, Northwest Ontario, Canada

Publication Number: 2021 NI 43-101 Date: 2021

Author: Hanrahan, R.J., Larder, C., Peters, K.S., Lowicki, F., Puritch, E., Feasby, D.G., Kuchling, K.

Publisher Name: Wave International for Rock Tech Lithium

Location: SEDAR

Publication - NI 43-101 Technical Report, Mineral Resource Estimation, Upgrade 2018, Georgia Lake Lithium Properties, Beardmore, Ontario, Canada

Publication Number: 2018 NI 43-101 Date: 2018

Author: Peters, K.R.S., Lowicki, F.

Publisher Name: DMT for Rock Tech Lithium

Location: SEDAR

MonoMap - Geology and lithium deposits of Georgia Lake area, District of Thunder Bay

Publication Number: R031 Page: 72, 79, 89, 105  Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - Independent Technical Report and Updated Resource for Nama Creek Main Zone North Pegmatite, Georgia Lake Lithium Property, Beardmore, Ontario, Canada

Publication Number: 2012 NI 43-101 Date: 2012

Author: Selway, J., Baker, J., Magyarosi, Z., Dixon, A., Sanders, R.

Publisher Name: CCIC for Rock Tech Lithium

Location: SEDAR

Publication - Geology of Canadian Lithium Deposits; Geological Survey of Canada, Economic Geology Report 21

Publication Number: EconGeol Rep21 Page: 56-57  Date: 1965

Author: Mulligan, R.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/102454

Folio - Pijitawabik Bay area (Kilkenny Township), District of Thunder Bay

Publication Number: GDIF188 Date: 1997

Author: Thunder Bay RGO

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office