kerve

Since the method causes serious depletion of ore during mining of upper plate,the inclined cutting raise heading together with inclined medium or deep hole kerve is suggested.

以无底柱为代表的崩落采矿法中,割拉槽至关重,前无底柱采矿大多采用垂直割天井与割平巷并配以中深孔联合拉槽的割方法,方法在对矿体上盘回采过程中损失贫化较大。