The Geological Environment Control And Benefit Evaluation Of Pyrite Mine In Luobo Town, Xuyong County

The pyrite resources are rich in Luobo town, Xuyong county. In the past more than 50 years arge-scale mining development, it was not only promoted economy’s development and society’s advancement, but also destroyed mine’s geological environment hardly, brought a series of problems, threaten the local peoples’ s production and living.On the basis of the investigation and study for physical geography overview, geology environment background, mining status, land use status and so on for the pyrite mine, analysis of the main geological environment problems of the region as follows: land resources’ s destruction, aquifer structure’s destruction, landforms and landscape devastation, and emergence of frequent geologic disaster, and some countermeasures for therelated problems are raised. The specific measures are as follows: using lime to improve soil pH value, planting the canola to remove the heavy metal content in the soil, reclamation of industrial and mining wasteland; building reservoir to resolve water supply; adopting the greening projects to repair the landform landscape; building retaining wall to prevent landslide disaster, etc. after analysis the information, selects the index from three aspects of economic benefits, ecological environment benefits and social benefits, construct the evaluation index system. Ⅱ level evaluation index are 13, such as direct economic value, acidic soil management area, newly-increased farmland, eliminate the geological hazard and so on. Using the analytic hierarchy process(AHP) to determine evaluation index weights, combined with the construction of the membership matrix of fuzzy mathematical method, obtained the comprehensive benefits evaluation model of the mine geological environment control, and comparative analysis before and after treatment benefits.The results showed that: differences are significant before and after mine geological environment control in Luobo town, which are lower before, while significantly improved later. According to the principle of maximum membership degree, every benefits evaluation level of the study area reached the Ⅱlevel. In order to more intuitive to response evaluation results, the corresponding evaluation results and scores were calculated: the greatest change should be social benefit, increased from 5.47 points to 73.83 points; ecological benefit scores from 19.31 points to 75.93 points; economic benefits scores from 25 points to 80.81 points; comprehensive benefits from 18.82 point to 77.46 points. According to the score and corresponding principle, every benefit evaluation level achieved Ⅱlevel. This fully shows that through the geological environmental control can not only solve the problem of existing mining Geo-environmental Problems, ensure people’s life property safety, but also can increase the farmers’ income, fully arouse peasants’ enthusiasm for production.