Using the largescale middle gradient sweep ladder, the authors rapidly delineated the

distribution of anomalies. IP sounding device was adopted to detect space state of the polarization

body, and frequency spectrum characteristics of IP field were used to distinguish graphitebearing

marble from metal sulfides. Based on comprehensive geophysical exploration in combination with

geological conditions of the ore deposit, the dualfrequency IP method has achieved good results in

the exploration of a goldcopper deposit in southwest Henan Province.