Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52H08SW00003

Record: MDI52H08SW00003

General

Commodities

Primary Commodities: Lithium, Beryllium, Rubidium, Tantalum

Secondary Commodities: Cesium, Niobium

Location

Township or Area: Oskawe Lake Area

Latitude: 49° 19' 54.79"    Longitude: -88° 16' 36.37"

UTM Zone: 16    Easting: 407237   Northing: 5465135.01    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52H08SW

Point Location Description: General

Location Method: Conversion from MDI

Access Description: The property is approx. 125 km NE of Thunder Bay and can be accessed going east on Highway 11/17 then north on Highway 11. From Highway 11, the property is located approx. 12 km to the west. Access is possible by a combination of limited use roads and trails, or by helicopter.

Exploration History

1955: Staked by prospectors F. Bergkvist and O. Niemi. Lun-Echo Gold Mines conducted geological mapping and sampling, and drilled 39 DDH totalling 3219 m. 2009: TNR Gold Corp. conducted a sampling program. 2010: Cricket Capital Corp. optioned the property and conducted soil sampling, grab and channel sampling, geological mapping, and prospecting. 2022: Ultra Lithium Inc. carried out channel sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Quetico

Geological Age: Archean  

Geology Comments

Jun 29, 2017 (Therese Pettigrew) - Bedrock geology in the Forgan-Georgia Lake area is of both Archean and Proterozoic ages. The rock sequences of these two differing geologic times are separated by a major angular unconformity. The oldest Archean rocks exposed in the area consist of a clastic metasedimentary sequence conformably overlain by metavolcanic rocks. These rock sequences, particularly the metasediments have been intruded by large bodies of granitic rocks and by numerous sills and dykes of genetically-related porphyry, granitic pegmatite, and aplite. Also cutting the metasedimentary rocks are small stock-like masses and narrow dykes of mafic intrusive rocks. The mafic intrusive (diabase) rocks are middle Proterozoic age. Diabase bodies intrude as sheets and dykes into both Proterozoic sedimentary and Archean metasedimentary and granitoid rocks. The largest diabase intrusions occur as flat sheets (Logan sills), up to 198 m in thickness and others as dykes of vertical or near-vertical attitude (AFRI 20000006313).

Lithology

Lithology Comments

Jun 29, 2017 (Therese Pettigrew) - All of the pegmatites occur as near-vertical dykes with a northeast strike parallel to surrounding metasedimentary host rocks (AFRI 20000006313).

Mineralization

Mineralization Comments

Jun 29, 2017 (Therese Pettigrew) - Historical sampling of the No. 1 Pegmatite Dyke returned 2.57% wt.% Li2O over a width of 6.4 m, 4.23 wt% Li2O over 7.5 m, and 1.98 wt.% Li2O over 7.6 m (Pye, 1965). Surface work by Lun-Echo indicated that the No. 1 pegmatite is exposed on surface for about 274 m, ranging in width from 4.6 to 14.2 m (averaging about 9 m), with a strike of 220 degrees and dip of 65-70 degrees to the SE. It contains about 30% spodumene and sporadic black tantalite-columbite crystals up to 3.8 cm long. The same dyke was sampled by TNR in 2009 and returned 2.57 wt.% Li2O over 4 m in a range of 1.69 to 3.40 wt.% Li2O. The 2009 grab sample of this dyke yielded the highest assay value to date, measuring 3.61 wt.% Li2O (AFRI 20000006313). The No. 3 Pegmatite has been traced for 320 m with an averaged exposed width of 6.1 m. It contains approximately 25% spodumene and was tested by 10 DDH totalling 832 m. The best intersection was 9.0 m of pegmatite with an average grade of 0.80 wt.% Li2O including one 1.5 m section from the hanging wall contact that returned 1.78 wt.% Li2O. Surface sampling by TNR in 2009 returned up to 0.78 wt.% Li2O in grab samples and 1.39 wt.% Li2O over 2.5 m of a composite channel sample (AFRI 20000006313). Pegmatite 5 returned assays of 110.50 ppm Ta2O5, 136.14 ppm Ta2O5, 167.89 ppm Ta2O5, and 505.54 ppm Rb2O. Pegmatite 6 returned an assay of 1241.87 ppm Rb2O (AFRI 20000006313). Ultra Lithium cut channel samples in 2022. Channel 1 intersected 10 meters wide pegmatite with average 8,417 parts per million (ppm) lithium (Li) or 1.88% Li2O. The other rare metals assayed average 203.30 ppm Be, 33.99 ppm Cs, 64.27 ppm Nb, 998 ppm Rb, and 42.98 ppm Ta. At Channel 1, a 3 m wide section (Samples 906574-6) assayed average 2.52% Li2O, similarly, a one-meter section (sample 906571) assayed 2.86% Li2O. Channel 2 also intersected 10 meters wide pegmatite with average 6,020 ppm Li or 1.29% Li2O. The other rare metals assayed average 207.3 ppm Be, 28.17 ppm Cs, 65.07 ppm Nb, 753.2 ppm Rb, and 38.75 ppm Ta. A one-meter section (Sample 906589) assayed 2.05% Li2O (Ultra Lithium news release March 22, 2023).

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:

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

Publication Number: R031 Page: 81-83  Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - Niobium (Columbium) and Tantalum in Canada; Geological Survey of Canada, Economic Geology Report 29

Publication Number: Econ Geol 29 Page: 117-119  Date: 1974

Author: Dawson, K.R.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/103996

MonoMap - Columbium (niobium) deposits of Ontario

Publication Number: MDC014 Page: 53  Date: 1971

Author: Ferguson S.A.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

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