Abstract:

We have carried out concealed uranium ore prospecting by geogas and soil X-ray fluorescence (geochemistry)
measurements in the exploration area of uranium deposits in southeastern Hubei Province. Measurements of the known uranium mining
areas show that uranium occurs in the primary and secondary fractures. Above the ore fractures and along the direction extended from
the fracture in the adjacent area, forms the geogas and soil geochemical anomaly area of uranium. In the abnormal zone, Pb, Zn, Cu,
Au in the geogas show anomalies, but also show obvious difference. The anomalies are accompanied by low amplitude anomalies in W,
Bi, Y, Mo, Mn, As and so on. According to the comprehensive analyses of exploration area with geogas and soil X-ray fluorescence data,
the northwest part of the surveyed area north of the secondary fracture F7 captured all the characteristics of geogas and soil with known
ore anomaly. According to the relationship between abnormal position of geogas and fracture, uranium may be buried at the depth of
200~350 m, on to the ore body, extending 220 m along the strike. At present, uranium ore bodies have been confirmed in the abnormal
area in a borehole at 200 m depth. Further exploration engineering work is in progress.

Key words: geogas survey；X-ray fluorescence measurements of soil；abnormal features；concealed uranium；ore-prospecting