Abstract

The Mary Kathleen deposit in northwest Queensland consists of uraninite associated with allanite, in places with rare earth silicates and sulfide minerals, in intensely garnetized calc-silicate rocks forming the central unit of the Precambrian Corella beds, which have been highly dislocated and intruded by granitic rocks. The deposit is considered pyrometasomatic in origin, and the solutions responsible for garnetization and mineralization to have been late-stage emanations from the granitic magma. The uraninite has been altered to gummite, uranophane, and beta-uranotil in the zone of oxidation, which extends to a depth of about 50 feet.

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