Mine geological environmental impact evaluation based on FAHP-Entropy Weighting Method: an example of limestone mines in Wuming District

Mine geological environmental impact evaluation is a system characterized by complexity and fuzziness, which provides a scientific basis for the rational allocation of limited restoration resources to mines with different degrees of impact. In order to evaluate the impact and extent of numerous mines on the surrounding geological environment more accurately and efficiently, this paper selects 38 limestone mines in Wuming District, Nanning City as the research objects. Fourteen evaluation indicators, encompassing geological environmental background, resource disruption, geological hazards, and the condition of mining development utilization, have been chosen to construct the evaluation framework for the mine geological environment. The FAHP-Entropy combination weighting method, which combines fuzzy analytic hierarchy process （FAHP） and entropy method, is used to comprehensively evaluate the degree of geological environmental impact of the mines. A mining geological environmental impact evaluation system （MGES） is developed based on the MATLAB platform. Among the MGES application examples, 38 limestone mines have been evaluated, revealing that only 21% of the mines have a minor impact on the geological environment, while the percentage rises to 47% for mines with a moderate impact and 32% for mines with a severe impact. The overall evaluation of the geological environmental impact in Wuming District falls within the severe to critical level, which provided guidance for the limited governance funds of the Wuming District government to prioritize the management of mining areas. The system is easy to operate and can compensate for the complexity and difficulty of traditional methods. It has great advantages in dealing with large-scale data and can serve as a reference for professionals and scholars in the field of mining geological environmental impact evaluation.