Plant 2/3 was known as the Ore Refinery & Denitration Plant. It was called Plant 2/3 because two separate functions occur in the same building. Here uranium values were recovered from feed materials (i.e., ores, concentrates and residues) and were converted to concentrated uranium trioxide, also called orange salt. In addition to uranium, the Refinery was capable of extracting and purifying a number of different materials. The Ore Refinery consists of three major process areas designated digestion (Plant 2), extraction and denitration (Plant 3). Support areas include nitric acid recovery, raffinate treatment and refinery sump. The digestion, extraction, and raffinate areas included 'hot' and 'cold' sides. To provide radiation protection from the radium-bearing Q-11 ore "hot" material, concrete shielding was provided around appropriate process equipment and the 'hot' side of each area was enclosed by concrete walls.