The Use of Drone in Risk Assessing of the Mining Works Performance Case Study

Abstract

mining works their as well as the assessment of possible of the in the important of is the of the works after since people's safety can be after due to the morphology and limited or even access to the it is not possible to capture all and collect data using classical surveying methods. In order to reduce the risk of any threat, it is necessary to monitor the mining works and evaluate the success of their performance in a safe manner, and this is possible using unmanned aerial vehicles data collection and risk analysis on the surface quarry located in the of in the western part of the peninsula, about km northwest of Pula. The in which a crushed building stone is mined is covering a total area of 3,79 ha and is wide 285 m and long 181 m. As a result of blasting in the south part of the quarry, too much rock was blasted in the form of rock material overcut on the highest bench. This compromised the stability of the bench, surrounding terrain and therefore the safety of people inside and outside of the quarry. The analysis of the mining works performance and risk Analysis of the risk assessment was made using two different models: a three-dimensional photogrammetric model and two-dimensional orthophoto model of the terrain and mining works. The risk analysis was performed after blasting on 30 x 150 m area located in the south part of the quarry. The analysed area is a part of the highest bench with a maximum height of 23 m in the eastern part, which decreases to only 5 m on the western part with designed bench slope of 70°.First analysis was carried out on the two-dimensional orthophoto model created from the collected aerial data. The area was analysed by plotting the peak parts of the bench after blasting and comparing them with the designed mining works contours. The analysis revealed that the mining works after blasting correlates to the design parameters and that they were performed with great precision. Measurement was conducted at regular intervals of 10 meters, and a total of 19 measurements were made. The average deviation of the performed mining works in relation to the mine design is 0,816 meters while the minimum deviation is 0,042 m and the maximum deviation is 3,497 m. Second analysis was carried out on the three-dimensional photogrammetric model. The 19 measurements were carried out at the same locations as well as on the two-dimensional orthophoto model in order to compare the results. Considering the three-dimensional model display capabilities, parts of the highest bench were observed, where a part of the rock mass was over blasted behind the designed slope and below the terrain. A mining works line was plotted on the parts of the bench toe where the maximum deviation from planned mining operation were assumed. The minimum deviation of the performed mining works from the planned state is 0,096 m, the maximum deviation is 4,686 m and the average deviation is 1,025 m. The continuous insight into the mining works performance in relation to the mine planned model is a necessity of every mining operation. The application of this method allows for fast and easy but above all secure data collection from a safe distance. Based on the performed analyses, a greater deviation of the performed mining works on the three-dimensional photogrammetric model is observed compared to the two-dimensional model. The reason