The mineral and chemical compositions of uranium ores from a deposit in Xinjiang were investigated, and acid agitation and column leaching tests were carried out in laboratory. The results showed that there was pyrite in ores, and contents of calcium, magnesium and carbon dioxide were high. U~ranium existed in ores is mainly in the form of tetravalent. It is necessary to add oxidant and the consumption of acid was high. The uranium leaching rates in agitation and column tests were more than 85% ,and the consumption of sulfuric acid was above 10%. Meanwhile, the results ha...