## 8 Conclusions and Recommendations  
In this paper, we analyzed the engineering geology of the mining area of Yinshan open pit in detail, and carried out on-site engineering geological investigation work by using small low-speed UAV and image reconstruction and interpretation. We carried out a production blasting vibration test in the Yinshan Mine, obtained the blasting vibration attenuation law, and analyzed the impact of blasting vibration on the slope rock. We analyzed the stability of the slope of the mining site by using FLAC3d software and the limit equilibrium method. Based on the analysis of the data, the following conclusions and recommendations were made on the stability of the south slope of the open pit of the Yinshan Mine:  
1. The main lithology of the mining area includes phyllite, quartz porphyry, and Quaternary residual deposits. The rock integrity of the slope ranges from \"broken\" to \"more complete\". There are three faults in the geological investigation area, which are combined with joints and fissures, constituting cutting and sliding surfaces in the rock mass, and easily forming wedges and other conditions favorable to collapse and sliding. It is suggested to pay close attention to the distribution of the newly revealed fault fragmentation zone and dense structure surface, further analyze and summarize the destabilization and damage characteristics of the slope, and, if necessary, take reinforcement measures for the potentially dangerous slope body or partially slow down the slope.
2. The maximum one-stage charge of the three blasts was 410 kg, and the maximum blast vibration was measured as 7.8745 cm/s in vertical direction (vector combined velocity 8.8547 cm/s), which did not exceed 24 cm/s and met the safety requirements. It is recommended that pre-cracking blasting and light surface blasting technology should be used when blasting against the gang slope adjacent to the final boundary of the quarry or the permanent slope, optimizing blasting parameters and further strengthening the research on vibration reduction control technology.
3. According to the results of numerical simulation analysis, the top plastic zones of mining area H and mining area I are penetrated with the upper step slope, suggesting that damage may occur to the slope at local locations due to the impact of the mining area. The influence of the dense area of the empty zone is more obvious. According to the result of the ultimate equilibrium analysis, the current slope meets the requirements of the safety code when considering only the self-weight and taking into account the blasting vibration force load, and the slope stability is good. However, the design excavation slope is close to the critical value of the safety coefficient specified in the code under both combinations of load, and there is the risk of instability. It is suggested that the final slope angle of some slopes should be optimally adjusted during the design mining process, and relevant technical measures should be taken to over-detect and timely deal with the potential mining void area to effectively guarantee production safety.  
Software, P.L. and X.Q.; Investigation, C.W.; Writing--original draft, H.C. and G.M.; Writing--review & editing, J.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the Fundamental Research Funds for the Central Universities, grant number 06500229.  
Not applicable.  
The original contributions presented in the study are included in the article. Further inquiries can be directed to the corresponding authors.