In order to reach a large,untapped reserve of high-quality coal,D8 Cloverlick Mine proposed to mine a corridor nearly 60......

Many states rely upon the Pennsylvania 1957 Gas Well Pillar Study to evaluate the coal barrier surrounding gas wells.The......

韩桥湾煤矿二盘区下部2-2煤层厚度大,开采条件优越,先行采用房柱式开采完毕,使其上部1-2煤层不能按正常顺序开采。根据两煤层赋存......

The objective of this paper is to study the behavior of a low thick and low depth coal seam and the overburden rock mass......

Room-and-pillar mining with pillar recovery has historically been associated with more than 25%of all ground fall fatali......