Abstract: The traditional acceptance of goaf treatment effect in open-pit mine is mainly based on experience method. However，there are some limitations in macroscopic analysis from the overall shape of collapse， so it is difficult to accurately determine the actual effect. In order to evaluate the goaf treatment effect more efficiently， low-altitude UAV aerial survey technology is proposed， which is a non-contact surveying and mapping method， with good safety and reliable precision and high efficiency. The connotation of fine acceptance of goaf is given， which is applied in the treatment stage of blind goaf left by 649 m platform in Dabaoshan Mine. The DJI Phantom 4 RTK small UAV equipped with high-definition single lens was used to realize 5-lens aerial survey with altitude of 100 m. The two-period 3D model information of blind goaf before and after blasting was obtained， and the accuracy verification met the requirements of 1∶500 topographic drawing. The South IData software is used to realize the combination of blind goaf range line and three-dimensional model. The calculation results show that the increase rate of filling relative height is 110%~200% after blasting. Combined with multi-angle aerial images and actual excavation operation， it is verified that the blind goaf is well processed. The practice shows that low-altitude UAV aerial survey technology is feasible in fine acceptance of goaf treatment effect of open-pit mine.

Key words: open-pit mine, blind goaf, low-altitude UAV aerial survey technology, 3D model, accuracy verification, filling rate, fine acceptance