In the Liutang ore-prospecting target area on the outskirts of the Hunan lead-zinc polymetallic orefield which has been investigated in great detail,the authors used integrated methods,such as high-precision magnetic survey,high-precision gravity survey,high-sensitivity soil and rock survey,and carbon-oxygen isotope determination, to conduct reconnaissance and detailed investigation.In the Liutang prognostic area which shows no mineralization and alteration at surface,the utilization of the"magnetic field sudden change area"and weak Pb,Zn,Ag,Sb and As anomalies as the main indicators led to the discovery of a concealed lead-zinc-silver deposit at the depth of greater than 400 m.It seems that the utilization of new methods and new techniques is the best means for extracting deep ore-prospecting information in the investigation and evaluation of mineral resources in ore prospect areas (belts).This paper has summed up the basic train of thought for ore prospecting and prediction,and illustrated the successfulness of using the "prediction-reconnaissance consistency" principle.