The preliminary operation of the Acid Leach - CCD - Solvent Extraction Pilot Plant at Grand Junction, Colorado, was conducted from November 8, 1956 to January 3, 1957 using White Canyon ores. The report contains information on the grinding, leaching, and liquid-solid separation by continuous countercurrent decantation. Detailed information is presented on the liquid-liquid solvent extraction of the leach liquor using organic solvents containing di-2-ethylhexyl phosphoric acid or triisooctyl amine. Results show White Canyon ores to be amenable to the Acid Leach - CCD - Solvent Extraction process. Using di-2-ethylhexyl phosphoric acid, reagent consumptions were relatively high, whereas with triisooctyl amine excellent recovery of uranium was obtained with moderate reagent requirements.

During the period of February 10 to May 8, 1958, Holly Blend ore from the Holly Minerals Company of the Ambrosia Lake district in New Mexico was treated in the Acid Leach - Contercurrent Decantation - Solvent Extraction Pilot Plant at Grand Junction, Colorado. This report contains detailed information on leaching, as applied in the processing of this ore. Results show the ore to be amenable to the Acid Leach - Countercurrent Decantation - Solvent Extraction process.

Distillation - Liquid-Liquid Extraction - Adsorption and Ion Exchange - Leaching - Crystallisation - Drying - Appendix - I