Since the adoption of liquid trapping agent, the observation accuracy of geogas has been greatly

improved through purification of reagents, utilization of superclean environment and  improvement of the

collecting device. Geogas anomalies appear over concealed deposits, and a favorable effect is obtained in ore

prospecting. This paper describes the features of geogas element distribution over concealed metallic deposits, in

loessial overburden areas and on alluvial plains. Geogas survey is an effective geochemical means and can be used

in search for concealed deposits in similar landscape areas.