Taking the CSAMT method in the exploration of Cu-Fe ore deposits in Donggang area as an example and combined with geological and physical conditions, the authors delineated the distribution of rock body and provided the reliable basis for further geological work and layout of drill holes. Drilling and gravity validation reveals that Cu-Fe orebodies are mainly produced in breccia, Fe orebodies are generally located in the core of the low resistivity zone with the resistivity below 20 Ω·m, and Cu orebodies are located in the relatively low resistivity zone with the resistivity from 20 Ω·m to 80 Ω·m.