Abstract: This paper aims to investigate the mechanism of fine moraine flow during uniform ore drawing,focusing on the fine moraine particles present on the surface of Prang Copper Mine. An indoor three-dimensional physical model test method is employed to conduct uniform ore drawing tests with coarse ore covered by fine-grained moraine. The research findings demonstrate that the flow passage of fine-grained moraine particles during the uniform ore drawing process is primarily governed by the "pore filling mechanism" with the degree of flow passage depending on the size and number of randomly generated pores during coarse ore drawing. Smaller moraine particles exhibit faster flow velocities,more pronounced flow effects,and shorter flow times. Based on the observed behavior of fine-grained moraine particles during the experiment,a generalized model for their flow passage mechanism is established. This model reveals that the relative movement between fine-grained moraine and coarse ore is the internal factor driving the flow of fine-grained moraine. Additionally,the more pronounced the relative movement between fine-grained moraine and coarse ore,the more significant the penetration of fine-grained moraine particles. The study provides theoretical support for understanding the flow characteristics of fine particles and holds practical engineering significance for disaster prevention and control in caving mines and ore dilution control under the presence of fine particles.