As part of the British Columbia Geological Survey Branch’s Coal Quality Pmject, washability characteristics of coals from all parts of the province are being compiled (see manuscript S-l, this volume, for descriptions of other ongoing coul quality studies). The interpretation of these data will provide insight into the geological basis of washability. and hopefully provide practical information...

Physical simulation is one of the effective methods to study mining problems, but selection and proportion materials are greatly affected by regional environment. This paper based on a multilevel orthogonal design test scheme using sand, lime, gypsum as in Shangwan coal mine Shendong coalfield, with sand cement ratio, paste ash maintenance days variables. The effect polar difference method stre...

The Yanzhou coalfield is an important coal production base in north China, wherein a huge amount of mine drainage has occurred; however, there been relatively little research on the multi-layer groundwater system. In this study, Dongtan Coal Mine was considered as object and total 95 samples were collected. Furthermore, hydrogeochemical statistical methods employed to better understand characte...

The presence of gas content in medium- and high-rank coal poses a threat to safety production. Safe extraction is based on correct understanding the pore structure coal. This work investigates characteristics evaluates their fractal structure. samples were collected from Huainan Coalfield Qinshui Coalfield, divided into four types, according difference surface bright characteristics. Through ad...

To prevent water inrush hazards of mining under the Quaternary unconsolidated confined aquifer in North China coalfield, it is necessary to build a prediction model guarantee coal safety production. The current method evaluating aquifers easy fall into problems simple superposition evaluation factors, large subjectivity factor selection, and low accuracy results. In this paper, an analytic hier...