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The Allan Lake carbonatite was discovered as a result of a reconnaissance air-borne gamma-ray survey flown in 1977 under the Uranium Reconnaissance Program.  Follow-up investigations in the fall of 1983 lead to the discovery of a glacial dispersal train composed of thorium-rich till and containing Th-bearing carbonatite boulders.  Based on the results from a series of closely spaced flight lines and initial follow-up studies, ground investigations were initiated during the summer of 1984.  These included in-situ gamma-ray spectrometry, till geochemistry, biogeochemistry as well as lake water and sediment geochemistry.  Additional air-borne geophysical surveys were carried out in conjunction with the ground investigations.  This study is published in Journal of Geochemical Exploration v.30.

Geological Survey of Canada