[en] The geogas method research on a blind hydrothermal uranium deposit shows that geogas anomaly of uranium and other mineral elements are very clear and effective upon the ore-controlling structures by using plastic foam as the capture media. Through the microscopic research using SEM-EDS, submicron uranium particles were discovered both in the ore-body and the surface soils upon the deposit. The size of the particles in soils is about 600 to 700 nm, and the particles were attracted on the surface of the clay minerals. Through comparing the contents of the two types of particles, a close relationship was found between the soils particles and the ore-body particles. According to the geochemical characters of uranium, it is reasonable that the uranium particles in soils are the products of the particles in the ore-body experienced vertical migration and hydrochemical action. The discovery of the submicron particles can provide a microscopic evidence for deep-penetrating geochemical method in uranium exploration. (authors)