Hadamengou gold deposit is a super-large gold deposit in the central of the Inner Mongolia.The mineralization type is potassic feldspar that is different with the common sericitization in the most of gold mineral deposit in the North China Platform.The distribution of metallogenic belt is controlled by two big rift belts in front and back of the mountain，and they create many of secondary faults.Piedmont potassic alteration zone is a NEE-NE red-brick potassium feldspar alteration zone nearby piedmont fault.The orebody discovered in this district is mainly formed in K-feldspar alteration rock or in quartz veins among the altered rock.CSAMT method has such merits as great exploration depth，strong anti-interference ability，clear resolution ability for the geological body within the depth of 2 000 m.CSAMT is applied in Hadamengou ditch mine，and the result shows that，the piedmont fault and piedmont potassic alteration zone can be reflected by inversion data abnormality，concealed orebody is discovered in the deep of the body，so CSAMT is proved a great technique in geological prospecting.