由东庞矿和北京开采所共同完成的东庞矿贴近冲积层4．sin综采一次采全高试验，于1998年12月17日通过了河北煤管局组织的专家鉴定。东庞煤矿2＃煤层浅部冲积层下40m煤岩柱以上共压保护煤柱煤量4Mt，其中小于20m煤岩柱的压煤约2Mt。为了最大限度回收这些煤炭资源并拓宽4．sin厚煤 Dongpu Mine, which is jointly completed by Dongpu Mine and Beijing Mining, approaches alluvial layer 4. sin fully mechanized mining a full-height test, on December 17, 1998 passed the identification of experts organized by Hebei Coal Administration. Dongpu Coal Mine 2 # coal seam below the shallow alluvial layer 40m coal pillar above the total pressure protection coal 4Mt, of which less than 20m coal and coal pillars of about 2Mt. In order to maximize the recovery of these coal resources and broaden the 4. Thick coal