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Separation Rapids Lithium Project (Separation Lake area), Kenora District, Ontario, Canada

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Latitude & Longitude (WGS84): 50° 15' 33'' North , 94° 26' 35'' West
Latitude & Longitude (decimal): 50.25944,-94.44306
GeoHash:G#: cbuvfvkwm
Owned/operated by:Avalon Advanced Materials Inc.
Locality type:Project
Köppen climate type:Dfb : Warm-summer humid continental climate

The Separation Lake area (not a formal geographic name rather an area around the lake that includes primarily Paterson Lake Area & the Treelined Lake Area) is host to the most important rare-element pegmatites in Ontario, Canada. They include the Big Whopper and Big Mack petalite pegmatite systems which potentially represent the world's second largest lithium deposit of this type. The pegmatites occur in two distinct clusters adjacent to the Separation Rapids pluton which is thought to be the source of the rare-elements. Beryl-type and complex-, petalite-subtype pegmatites are the most common and a few pegmatites have characteristics similar to the lepidolite-subtype.
There are currently 29 recognized pegmatites in the area.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

52 valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

2500 - 2800 Ma

ID: 3192850
Archean intrusive rocks

Age: Neoarchean (2500 - 2800 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Neoarchean - Mesoarchean
2500 - 3200 Ma

ID: 624862
Foliated tonalite suite

Age: Archean (2500 - 3200 Ma)

Comments: Superior Province

Lithology: Tonalite to granodiorite-foliated to massive

Reference: Ontario Geological Survey. 1:250 000 scale bedrock geology of Ontario. ISBN 978-1-4435-5705-4. Miscellaneous Release–Data 126 - Revision 1. [1]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Breaks, F.W. and Tindle, A.G. (1997) Rare-metal exploration potential of the Separation Lake area: an emerging target for Bikita-type mineralization in the Superior Province of Ontario; Ontario Geological Survey, Open File Report 5966, 27pp.
Tindle, A.G. & Breaks, F.W. (1998) Oxide minerals of the Separation Rapids rare-element granitic pegmatite group, northwestern Ontario. Canadian Mineralogist, 36, 609-635.
Tindle, A.G., Breaks, F.W. & Webb, P.C. (1998) Wodginite-group minerals from the Separation Rapids Rare-Element Granitic Pegmatite Group, northwestern Ontario. Canadian Mineralogist, 36, 637-658.
Tindle, A.G. and Breaks, F.W. (2000) Columbite-tantalite mineral chemistry from rare-element granitic pegmatites: Separation Lake area, N.W. Ontario, Canada. Mineralogy & Petrology, 70, 165-198.
Tindle, A.G. and Breaks, F.W. (2000) Tantalum mineralogy of rare-element granitic pegmatites from the Separation Lake area, NW Ontario, Canada. Ontario Geological Survey, Open File Report 6022, 378pp.
Tindle, A.G., Breaks, F.W. and Selway, J.B. (2002) Tourmaline in petalite-subtype granitic pegmatites: evidence of fractionation and contamination from the Pakeagama Lake and Separation Lake areas of NW Ontario, Canada. Canadian Mineralogist, 40, 753-788.

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