perbedaan stope and pillar mining dan room and pillar …
2020-5-26 · room and pillar vs longwall zmhbv . The room-and-pillar mining method is used in all of Pennsylvania''s underground bituminous coal mines including longwall mining operations, where it is used to develop the haulage and ventilation systems, and to delineate and support the longwall panels Until the relatively recent advent of modern longwall mining, room-and-pillar …