Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000001943

Record: MDI000000001943

General

Commodities

Primary Commodities: Rubidium

Secondary Commodities: Beryllium, Lithium, Niobium, Tantalum, Tin

Location

Township or Area: O Sullivan Lake Area

Latitude: 50° 28' 21.53"    Longitude: -87° 7' 52.26"

UTM Zone: 16    Easting: 490691   Northing: 5591192    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42L06NE

Point Location Description: OFR6195

Location Method: Other

Access Description: Travel west 25 lm on Road 643 from the community of Aroland. Turn right onto the Anaconda forestry haulage road and proceed north for 8.3 km.

Exploration History

2002: OGS staff carried out sampling. No assessment reports were found on file.

Geology

Province: Superior

Subprovince: English River

Geological Age: Archean  

Lithology

Lithology Comments

Dec 17, 2020 (Andrew Tims) - The leucogranite locally is gradational into very coarse patches that are quartz rich with blocky potassium feldspar crystals up to 40 cm in diameter. Faint green, beryl crystals up to 0.8 cm in diameter and 3 cm parallel to the length of the crystal are present.

Mineralization

Mineralization Comments

Jul 06, 2016 (Andrew Tims) - Bulk composition of green muscovite (see Table 7: 02-FWB-54-02) reveals levels of elements indicative of a fertile pegmatitic granite system and, particularly the elevated Ta (63 ppm), infers the presence of beryl-type pegmatites

Dec 17, 2020 (Therese Pettigrew) - The main unit is a garnet-biotite-muscovite pegmatitic leucogranite with abundant plumose intergrowths of quartz-muscovite. This pegmatitic leucogranite unit is conspicuous due to numerous, bright pink megacrysts of graphic quartz-potassium feldspar intergrowths that are up to 20 by 32 cm in size. These megacrysts are embedded within a white matrix that is mainly a graphic intergrowth of quartz and albite. Plumose intergrowths of coarse-grained muscovite and quartz are interstitial to the albite crystals. The pegmatitic leucogranite locally is gradational into very coarse patches that are quartz rich with blocky potassium feldspar crystals up to 40 cm in diameter. Irregular masses of potassic pegmatite also occur along the periphery of the quartz patches and comprise an irregular aggregate of blocky potassium feldspars. One of the quartz-rich patches contains sparse, faint green, beryl crystals up to 0.8 cm in diameter and 3 cm parallel to the length of the crystal. Garnets are found locally in the quartzrich patches and reach up to 1.5 by 2 cm in size. The red garnet in the quartz-rich patch is almandine with 24 to 33% spessartine. The pale green beryl is Cs2O poor with 0.08 weight %. Sample 02-FWB-54 returned 969 ppm Li, 241 ppm Cs, 12 ppm Be, 263 ppm Nb, 1991 ppm Rb, 116 ppm Sn, and 63 ppm Ta (Breaks et al, 2006).

Mineral Record Details

References

Mono - Fertile Peraluminous Granites and Related Rare-Element Mineralization in Pegmatites, Superior Province, Northwest and Northeast Ontario: Operation Treasure Hunt

Publication Number: OFR6099 Date: 2003

Author: Breaks F.W., Selway J.B., Tindle A.G.

Publisher Name: Ontario Geological Survey

Location:

Mono - Fertile and Peraluminous Granites and Related Rare-Element Mineralization in Pegmatites, North-Central and Northeastern Superior Province

Publication Number: OFR6195 Page: 53, 71  Date: 2006

Author: Breaks F.W., Selway J.B., Tindle A.G.

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