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Many geological factors affect coal mining and different geological conditions often correspond to different coal mining methods and different mining costs; therefore, it is of great significance to conduct quantitative and comprehensive evaluations of the mining geological conditions. In this study, we used the No. 72 coal seam in the Sunan mining area in the Anhui Province in China as an example. The study area was divided into 168 evaluation units and the coal seam thickness, the geological structure complexity, the gas content, and the geo temperature were chosen as evaluation parameters. The maximum difference normalization method was used to quantify and unify the parameter values. The evaluation factors were weighted and comprehensive evaluation indexes were obtained for each evaluation unit to achieve a quantitative and comprehensive evaluation. The evaluation results show that the mining geological conditions can be summarized as the following proportions in the different grades: 0% in Grade I, 18.5 in Grade II, 50% in Grade III, and 31.50% in Grade IV. The research methods used in this study provide a useful reference for the quantitative and comprehensive study of mining geological conditions in other coal seams and other mining areas. Introduction Many geological factors affect coal mining [1-2], and the mining of coal is closely related to the geological conditions and the different geological conditions often correspond to different mining methods [3-4] and different mining costs [5]. China is a country rich in coal resources and coal has been the main source of energy in China for a long time. With the improvement in coal mining technology and the increasing focus on the safe production of coal, it is of great significance to strengthen the research on the geological conditions of coal mining [6-7]. In this study, we used the No. 72 coal seam in the Sunan mining area in the Anhui Province in China as an example and conduct a quantitative and comprehensive evaluation of the mining geological conditions. Geological Backgrounds The Sunan mining area is located in southeast part of Suzhou City in the Anhui Province in China. The coal-bearing strata are Carboniferous and Permian formations, and the No. 72 coal seam is the main coal seam in the Sunan mining area [8]. The overall tectonic structure of the Sunan mining area is synclinal (Figure 1). From shallow to deep, the Sunan mining area consists of three parts [9]. In the shallow part, there exist the Taoyuan coal mine, Qinan coal mine, and Qidong coal mine. In the middle part, the coal resources have been prospected at the Qidong deep exploration area and at the Qinan deep exploration area. In the deep part, some ground-based geophysical studies and several exploration drillings have been conducted and this area is called the Sunan deep prediction area. 522 Figure 1. Sketch map of the Sunan mining area. Previous geological explorations, long-term mine production, and numerous scientific research studies have provided abundant information about the mining geological conditions, which provides a good foundation for this study.

Comprehensive Evaluation of the Mining Geological Conditions of the No. 72 Coal Seam in the Sunan Mining Area in Anhui Province, China