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An investigation was made of the extractive metallurgy of thorite ores. The work was done mainly on thorite ore containing 3.87% ThO/sub 2/ from the Powderhorn district of Colorado and on a composite sample containing 0.52% ThO/ sub 2/ from the West Mountains district of Colorado. Limited tests of a corroborative nature were also made on a sample containing 2.30% ThO/sub 2/ from the Lemhi Pass area on the Idaho-Montana border. Procedures examined by batch and continuous bench-scale tests are described. It was concluded that domestic thorite ores of the type examined are amenable to treatment by an acid leach solvent extraction process. Over 90% of the Th is readily recoverable in a product containing about 99% ThO/sub 2/. (C.H.)
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