Abstract
Where uranium-bearing veins have been found in British Columbia, the uranium mineral is the crystalline variety of uranium oxide, uraninite, rather than the amorphous colloform variety, pitchblende, that is found in the Great Bear Lake deposit and in occurrences of similar type elsewhere in the Precambrian shield. The British Columbia uraninite is not found in granite pegmatites such as the occurrences in eastern North America but rather in gold-bearing metallic veins. In these veins, the uraninite is associated with cobalt-nickel sulfarsenides similar to those found in normal mesothermal pitchblende deposits, but the other associated metallic minerals, arsenopyrite and molybdenite, and the gangue minerals, hornblende, feldspar, apatite, scheelite, monazite, and allanite, indicate that the veins are hypothermal rather than mesothermal.
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