Abstract: The feasibility of dry filling of tailings in the subsidence mine area was studied to overcome those problems caused by stockpiling and land occupation of tailings. The experiment of flow-through features of tailings under mining influence was designed， and the height of overburden rock and tailings was set as influencing factors. The visualization of tailings’ moving process was realized by high-speed camera. The results showed that the tailings cannot reach the drawing holes when the height of the loosening zone is lower than that of the interface between the tailing and the granular media. When the height of the loosening zone is higher than that of the interface， the tailing and the connected rock are loosened by ore drawing， so that the tailing can reach the drawing holes thus affecting mining activities. With the increase of the tailings height， the initial inflow volume of tailings increases， however， it cannot reach the drawing holes if the height of the loosening zone is lower than that of the interface. Therefore， the influence of the dry filling on the stripping ratio of the ore is little.

Key words: ore drawing, subsidence area, dry filling of tailing, flow-through features, high-speed camera