Uranium-bearing lodes at the Radium Hill mine in eastern South Australia occur in fractures on the south limb of a regional anticlinal fold in Precambrian gneisses which are intruded by two generations of basic igneous rocks and by soda aplite and associated pegmatites. Davidite, the ore mineral, is intimately associated with rutile, ilmenite, hematite, biotite, and quartz and is believed to have been introduced at a late stage in the mineralization following emplacement of the soda aplite.

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