关键词: 扇形孔技术, 矿体特征, 探矿工程

Abstract: The Middle Gully-Fault Gully lead-zinc mine area is the south east extension of the main mining area of Xitieshan，and its geological characteristics are basically the same as those of the main min⁃ ing area of Xitieshan.In order to effectively the exploration engineering and reduce the cost of exploration， the fan-shaped hole technology is adopted for the ore body in the area with large negative change and the ore body whose construction conditions do not meet the current requirements of exploration. Through the comparative study of the exploration results between the exploration stage and the production exploration stage，it is found that the application of the fan-shaped hole technology in the process of production explo⁃ ration can accurately control the ore body with great changes，and the change of orebody characteristics （shape，scale，thickness，occurrence and grade）can be well verified.The field application results show that the application of fan-shaped hole technology in the process of production exploration can improve the exploration efficiency，and ensure the sustainable development of the mine.And it also can reduce the explo⁃ ration cost，and effectively save the exploration project.

Key words: fan-shaped hole, orebody characteristics, exploration engineering