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Thor Lake syenite complex, Blachford Lake alkaline complex, Mackenzie District, Northwest Territories, Canada

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Latitude & Longitude (WGS84): 62° 4' North , 112° 45' West
Latitude & Longitude (decimal): 62.06667,-112.75000
GeoHash:G#: c7pc46cuw
Locality type:Complex
Köppen climate type:Dfc : Subarctic climate

The Thor Lake syenite complex is in the eastern half of the Blanchford Lake alkaline complex on the north shore and partially under the Hearne Channel of the Great Slave Lake, approx. 100 km east of Yellowknife. The complex is emplaced in the Grace Lake granite and represent one of latest stages of successive intrusions in the Blanchford Lake alkaline complex. It is roughly circular and is about 6.5 km in diameter. The age of the Thor Lake complex is 2097±10 Ma.

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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.


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BADHAM, J.P.N. (1979) Geology and petrochemistry of lower Alphebian (2.4-2.0 Ga) alkaline plutonic and hypabyssal rocks in the East Arm of Great Slave Lave, Northwest Territories. Canadian Journal of Earth Sciences, 16, 60-72.
DAVIDSON, A. (1978) The Blanchford Lake intrusive suite: an Alphebian alkaline plutonic complex in the Slave Province, Northwest Territories. Geological Survey of Canada, Paper 78-1A, 119-127.
DAVIDSON, A. (1982) Petrochemistry of the Blanchford Lake complex near Yellowknife, Northwest Territories, Geological Survey of Canada, Paper 81-23, 71-79
SHEARD, E.R., WILLIAMS-JONES, A.E., HEILIGMANN, M., PEDERSON, C. AND TRUEMAN, D.L. (2012) Controls on the concentration of zirconium, niobium, and the rare earth elements in the Thor Lake rare metal deposit, Northwest Territories, Canada. Economic Geology and the Bulletin of the Society of Economic Geologists, 107(1), 81-104.
WOOLEY, A.R. (1987) In: Alkaline Rocks and Carbonatites of the World. Part 1: North and South America. Published by University of Texas Press, Austin. 49 57.
Feng, Y. & Samson, I.M. (2015) Replacement process involving high field strength elements in the T-zone, Thor Lake rare-metal deposit. Canadian Mineralogist 53, 61-82.

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