Large-area low resistivity strata are existent in a certain leadzinc ore district of Gansu Province.

In the application of CSAMT to exploring concealed leadzinc ore bodies, the authors measured and analyzed in

detail electrical characteristics of rocks and ores in this ore district. It is concluded that low resistivity and

high resistivity anomalies are not caused by mineralization, whereas the transitional area of the low resistivity

anomaly is the favorable area for ore prospecting. Based on such an understanding, the authors arranged drill holes

and obtained satisfactory oreintersecting results.