Abstract

Describes a uraniferous locality in an old cobalt mine at Saegmuehlen, near Sulzburg in the Black Forest, Germany. The mineralization, which seems to be related to the granitic massif south of the Black Forest, is in the form of thin veinlets of pitchblende accompanied by loellingite and sulfides of Pb, Cu, Zn, Fe, and Sb in a quartz-carbonate gangue. Among European uraniferous deposits, there appears to be a progressive gradation from the Central Massif type, intragranitic and dominantly epithermal, to the central European type, located at the periphery of granite batholiths and dominantly mesothermal. Both types are related to Hercynian (Paleozoic) mineralization; the former seems to represent a late-stage product, derived from solutions originating deep in batholiths, whereas the latter was derived from more superficial zones.

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