1�� College of Earth Sciences��Jilin University��Changchun 130061��China; 2�� Inner Mongolia Shandong Gold Geological Minerals Survey Co.��Ltd ��Chifeng 024005��Inner Mongolia��China

The Bujinhei Pb- - Zn deposit with a lenticular and vein ore bodies��is a representative medium tem- perature hydrothermal vein- type deposit��occurred in the metamorphic sandstone and slate of the lower member of Shoushangou Formation�� The EW- oriented ore vein �� is well productive for industry�� According to the analysis of orefield geology��ore characteristics��magnetic survey and OPIS simulation��the transitional tectonic fractures be- tween EW and NE direction are reported as the zone where ore is easily to deposit�� In addition��the mineralized bodies are featured by high polarizability��high susceptibility��high thickness and high grade�� Magnetic abnormal maps manifest that the nearly EW extended contours of the first order level of 90° and 135° derivative of magnetic anomaly correspond to nearly EW- oriented fracture��and great abnomal gradient zone corresponds to the transitional area of fracture direction�� Sketch map of OPIS prediction manifests that orebody positions correspond to high value central part and around the centre zone or greater steep part of fracture surface distance�� As a result��the four pe- ripheral targets �񣬢򣬢� and ����and three deep targets ��-1����-2 and ��-3��have been delineated��and the target ��-2 has been verified��