Geological Environment Evaluation And Research On Mine Restoration And Governance In Gaodingshan Mining Area,Huaying City

As a mineral resource-based city,Huaying City is rich in mineral reserves and has a long history of mining.There are five major large mining areas in the city.Gaodingshan mining area as one of them,whitch has nearly 60 years of mining history.The long-term mining has caused huge damage to the geological environment in the mining area,resulting in the degradation of forest wetland resources,serious soil erosion and rocky desertification,frequent geological disasters,serious water pollution and reduced biodiversity.In order to complete the ecological protection and restoration of mountain,forest,lake and grass proposed by the state,the geological environment of the Gaodingshan mining area should be evaluate,and the evaluation results will provide a basis for the subsequent research on restoration and management of the mining area.Based on the collection of relevant geological data and investigation of geological environment in Gaodingshan mining area,this paper analyzes the geological environment problems existing in the mining area.Combined with the geological environment of the mining area,select appropriate evaluation factors,and determine the weights by entropy method and analytic hierarchy process.Based on the Arc GIS platform and the fuzzy comprehensive evaluation method,the geological environment of Gaodingshan mining area is comprehensive evaluated.Through the results of the comprehensive evaluation,the mine restoration management of Gaodingshan mining area is studied.The following results have been achieving.(1)The environmental geological problems in the area are dominating by geological disasters,and there are mine ecological destruction and environmental pollution.There are 22 geological disasters in the area,including 15 dangerous rocks,3 unstable slope disasters,and 4 debris flows.Ecological damage is mainly landscape damage and land occupation.Among them,the damage area of the landscape is relatively wide,mainly the mining wall and industrial plaza formed by mining,and the damage is serious.The total area of land occupation and damage is 369.43 acres,mainly industrial squares and slag accumulations,which extensively destroy forestland.In the case of environmental pollution,land resources are light polluted,and no new pollution will occur.Water pollution is a diffuse type of pollution,and its degree of pollution is relatively light,but in order to ensure the safety of water use,it still needs to be paid attention.(2)According to the environmental geological problems in the mining area and the need for restoration and governance,the Gaodingshan mining area is divided into8 zones.Among them,the geological disasters are mainly concentrated in ZonesⅡ,Ⅳ,Ⅴ,ⅦandⅧ.The severity of ecological damage varies from zone to zone,with zonesⅣandⅦbeing the most severe.The environmental pollution is mainly concentrated in theⅦandⅧareas where the three accumulations of slag are located,and the other areas are less affected.(3)According to the establishment principles of the evaluation factors,combined with the local geological environment conditions of the Gaodingshan mining area and the mining conditions.Nine factors including formation lithology,slope,mining degree,dangerous rock disaster,unstable slope disaster,slag and debris flow disaster,geomorphic landscape damage,land pressure and damage,and water pollution degree were selected as the evaluation factors of geological environment evaluation.After determining the weights using the analytic hierarchy process and the entropy method,the final weight of the evaluation factor is determined by the combined weighting method.(4)Based on the Arc GIS platform,vectorize the evaluation factors.Through the fuzzy comprehensive evaluation method,the geological environment of the Gaodingshan mining area is evaluated,and the mine geological environment evaluation results are obtained.Among them,the area with severe environmental impact is 0.4km~2,accounting for 6.6%of the entire study area.The general area of environmental impact is 0.52km~2,accounting for 12.7%of the entire study area.The area with good environmental impact is 3.98km~2,accounting for 80.7%of the entire study area.The evaluation results can fully reflect the degree of mining impact in Gaodingshan mining area,and provide a theoretical basis for the research on mine environment restoration and governance.(5)According to the result of geological environment assessment of Gaodingshan mining area,the restoration and control of the geological environment of the Gaodingshan mining area is studied.Propose a new idea of turning Gaodingshan mining area into a landscape park.By upgrading and transforming,the negative economic impact of Huaying City due to resource depletion will be resolved.Through the research on the restoration and governance of the mining environment in the Gaodingshan mining area,and using its research results in restoration and governance,it provides new ideas for other mining areas.