Studies On Geological Environment Variation Of The Lead-zinc Mine In Maoping, Zhaotong City

Geological problems are more serious under the current conditions, such as collapses, landslide, debris flow, ground subsidence, water-soil erosion, etc. in Lead-Zinc district in Maoping, just as high mountains and steep slopes, rich loose material source, concentrated heavy rain and serious private mining. The mine geological environment will vary badly with increasing development intensity, just because a large number of mining waste rock and debris is increasing and geological environment is disturbed strongly by mining and mineral processing activities. This paper, taking the recognition of variation regular pattern of mine geological environment of Lead-Zinc district in Maoping as a basispoint, internal and external affecting factors of the mine geological environment was analyzed, and the type, regularities of distribution and evolution of variation existing at current situation are ascertained, based on the mine geological environment investigated detailedly. Quality assessment for status of the mine geological environment is completed using Fuzzy Comprehensive Evalution Method, and forecast quality of the mine geological environment is assessed using Extension Clustering Predicion Method, as the basis for the results of the evaluation for status and variation patterns for guidance, to provide a scientific basis for management of peotection and restoration for the mining geology environmention.Through this study, the results and understanding following are achicved:1. Mine geological environment has five characteristics, such as complete type, wide damage area, densely goaf and prominent mine geological disaster, and severe water damage and severe losses and great harm.2. There are 13 kinds variation of geological environment in study area, namely: landslide, collapses, debris flow, ground movement, ground subsidence, ground crack, water-soil erosion, land occupation and destruction, spring dried up, ground water level descend, water pollution and soil contamination.3. Variation of the mine geological environment has features with artificial, mass, derivatives, regional and influence a wide range. The environment effect mainly displays in three aspects:damage to the infrastructure, the destruction of arable land and impact of mine water and soil.4. Mining geological environment quality evaluation system is established, with five major categories of 25 indicators:the specific geological setting, geological hazards, water and soil environment destruction, mining and hydro-vegetation, based on the geological background conditions, affect of mining activities, and mainly geological environment problems.5. Quality assessment for status of the mine geological environment is completed using Multi-level fuzzy comprehensive evalution model. The results show that:geological environment of the study area is divided into four levels:better, good, relatively poor, poor, and the poor area located in the concentrated area of mines before integrated.6. The quality of geological environment after five years mined is assessed using Extension Clustering Prediction Model. The results show that:the geological environment can be divided into four leves:better, good, relatively poor and poor, and the poor areas located in the concentrated area of mines before integrated, and the main mining in future and its side, varing from the area of relatively poor and poor of the status.