After nearly 20 years of exploitation,the reserves of Tuwaishan Gold Deposit have significantly decreased,necessitating exploration to increase reserves.By analyzing the regional metallogenic background and the geological characteristics of the mining area and deposit,it was found that the northeast-trending Gezhen fault controls the distribution of the gold deposit.The Tuwaishan Gold Deposit is pided into 4 ore zones from west to east.The ore bodies are controlled by secondary faults in the hanging wall of Gezhen fault.The barren intervals between ore bodies range from 10 m to 50 m,while the barren intervals along the strike of inpidual ore bodies range from 40 m to 80 m.The ore bodies are jointly controlled by multiple sets of northeast-trending faults,showing a rhombus grid pattern and reflecting the ore-hosting characteristics at fault intersections.Based on the characteristics and occurrence patterns of 3 delineated ore-hosting columns,the fourth rich ore column is predicted between Exploration Line 10 and 12.Low-grade thin ore bodies and mineralization,as well as small lenticular rich ore bodies,are found between the rich ore columns.According to the approximately equidistant distribution of ore-controlling structures,the lateral extension of ore bodies and the lateral angle,and the segmented enrichment patterns of ore bodies vertically,altered rock type ore bodies can be sought in different enriched ore sections.