The uranium-silver ores of Great Bear Lake have been described by Spence and Kidd1 who devoted their chief attention to the place and mode of occurrence of the veins and to the primary ore minerals. The large collection of material collected by Spence in 1931 contained a number of specimens in which the ore was brilliantly colored by a variety of oxidation coatings. The best of these were selected and sent to the Harvard Mineralogical Laboratory for possible identification. It proved on examination of the specimens that the coating films and tiny veins containing the oxidation products were so thin that very little material of any one kind could be obtained. However, some results were obtained which are presented here as a preliminary report. More and better material for description may be obtained during the mining season of 1932 in which case it is hoped that a more conclusive examination may be made.

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