The study on process mineralogy was carried out in Tangwan uranium deposit by means of electron microscope、identification of artificial placer

X-ray diffraction analysis and electron probe analysis methods. The types of uranium ore were primarily silicate type ore. Uranium mainly occurs in independent uranium minerals

which consisted of mainly pitchblende and a small amount of uraninite. The gangue minerals were mainly divided into silicate minerals such as quartz、feldspar

zeolite and carbonate minerals such as calcite and apatite. Uranium ore structure was given priority to vein and disseminated. Uranium minerals had a symbiotic relationship with quartz

calcite

pyrite and other minerals. The harmful compositions in the ore were calcite and pyrite with higher contents and should be leached after removing for reducing the consumption of acid.