Fuzzy Comprehensive Evaluation Method for Geological Environment Quality of Typical Heavy Metal Mines

Abstract

Zhaotong City, at the junction of Yunnan, Guizhou and Sichuan provinces in China, is rich in mineral resources, and high-intensity mining has brought great challenges to the mine geological environment. The evaluation of mine geological environment quality is still a complex and systematic work. The geological environment of different regions is very different, and it is difficult to adopt a unified standard for quantification. Therefore, a general evaluation method has not been formed 22 factors, including cumulative value of surface subsidence, earthquake intensity, debris flow source volume, ground crack length, fault density, number of mine pits, ponding area, aquifer thickness, annual rainfall, groundwater level drop, river erosion area, groundwater impact range, proportion of goaf area, soil heavy metal concentration, water pollution volume, PM2.5, integrity factor, weathering coefficient, joint density, uniaxial compressive strength, population density, annual per capita GDP, which affect the geological environment quality of the mine, are selected as evaluation factors. By applying the principles and methods of fuzzy evaluation, The geological environment quality of Maoping lead-zinc mine is divided into four grades: excellent, good, commonly and inferior. The evaluation results can provide decision-making reference for the current geological environment protection research and future renovation planning of Maoping lead-zinc mine.