842c Longwall Mining Abc 123 Testing Site Course
Aug 04, 2012 8.4.2c Longwall Mining. Longwall mining applies to thin, bedded deposits, with uniform thickness and large horizontal extension. Typical deposits are coal seams, potash layers or conglomerates, trona, and gold reefs. Longwalls are found in nearly horizontal deposits of coal and trona, whereas in metalnonmetal deposits, a steeper dip is tolerated.