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Economic Geology; October 1969; v. 64; no. 6; p. 691-693
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Anhydrite-pegmatite uranium ore at Bancroft, Ontario

H. W. Little

Anhydrite pods and dikes up to 40 feet wide locally contain sufficient uranium to constitute ore. The anhydrite grades into pegmatite, and crystallized earlier than the latest of the pegmatite minerals. Within the limits of experimental error, Pb/U and Pb/Th ratios indicate that uraninite in anhydrite is contemporaneous with that in pegmatite (1,000-1,100 m.y.). The anhydrite is believed to have formed by partial to almost complete fractionation of the primary pegmatite magma.

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