More is daily becoming known about the nature of the Algoma (Blind River, Ontario) U deposits and, accordingly, opinions on their origin may now be more meaningful. In the first published description of the field following its discovery in 1952 the author then omitted reference to the possible origin of the ores but tacitly implied that they were probably hydrothermal and hypogene by identifying the field as centrally situated in a large metallogenetic province characterized by the classical hypogene mineral assemblage of Co-Ni-U. The author is now having second thoughts on the subject. Observations on new data and his opinions follow. The presently suggested theory does not mark the end of the road but rather another milestone.

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