The gold deposits (spots) in Longkong-Reshuidaban area of western section of North Qilian is produced in ophiolitic melange belt,which is composed of volcanic group in Lower Ordovician Yingou group and basic-ultrabasic rocks.The ore body exists in the NW (NWW)-trending tectonic fracture zone.The wall-rock of the ore body is the tuff and basalt of volcanic group in Yingou group,and the ore-bearing lithology is tectonic breccia.The wall-rock alterations mainly include pyritization,carbonation,silicification,and the deposit genesis belongs to the medium-low temperature hydrothermal deposit.By analyzing the typical gold deposits of Longkong and Heicigou,and summarizing the ore-controlling factors and prospecting criteria,it is considered that there is a section with similar geological background of typical gold deposits in ophiolitic melange belt.In this section,10 comprehensive anomalies according to 1:50 000 stream sediments survey were circled and examined,26 soil comprehensive anomalies and multiple ore-bearing structural alteration zones were circled,indicating that the study area has good prospecting potentials.