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由于莱肯斯·瓦利煤矿的5号无烟煤煤层倾角为51～55°,致使日产量变化不均,最高可达4200t,最低可能因一两周内某一天开掘岩而仅为300～1000t。 为了开采上述的无烟煤,宾州瓦利·维犹的国际无烟煤公司(IAC)采用了放顶煤开采法,该技术所用的开拓工人数与一般煤矿一样多。尽管每生产5t煤需掘进1t岩石,但它的高生产率令人刮目相看。 这种市面上叫做“莱肯斯·瓦利红灰渣”的无烟煤,开采于向斜盆地的南翼。煤很脆,软弱性使该产品限于特殊市场。 该矿原来采用房柱式开采,1982年4月公司开始着手改革,进行经济开采技术试验。 从房柱式到分段冒落法开采
Due to the coal seam inclination of No.5 anthracite at Leicesins Wally Coal Mine ranging from 51 ° to 55 °, the daily output fluctuates unequally up to 4200t, with the lowest possible 300-1000t due to digging rocks on one day in a week or two. In order to mine the above anthracite, the International Anthracite Company (IAC) of Wali Weir, Pennsylvania, used a caving mining method that used as many pioneering workers as the average mine. Although 1t of rock is drilled for every 5t of coal produced, its high productivity is impressive. This anthracite, known as “Reinsworthy Red Ash”, is mined on the southern wing of the syncline basin. Coal is brittle and the weakness limits the product to niche markets. The mine originally used column and column mining, in April 1982 the company began to reform, economic mining technology test. From the column to the sub-section of the law mining