Overview of Highwall Mining Systems.
Kwitowski AJ; Mayercheck WD; Mayton AG
Paper in Coal Mining Tech Ergonomics & Policy 1989 :25-40
The significant number of highwall mining systems (hms) that either have appeared or are in the process of being developed shows the need for this type of mining system. Because all of the described systems require a minimum of operating personnel, with none permitted in the mined workings, very productive and safe operation is anticipated. Excluding the augering equipment, the new breed of hms share these common attributes: high coal recovery ratios on the order of 60 to 85 pct, with the U.S. Bureau of Mines mountain top conceptual system having the potential for nearly complete extraction; deep highwall penetration because (1) there are no power losses associated with increased extraction depth for the cutting (all systems) and haulage (most systems) functions and (2) most systems can be guided vertically and laterally to stay in the coal seam and maintain barrier ribs for roof control; extended flexibility in selecting mining strategies; the expanded recovery of coal reserves that were once considered not minable.
Paper in Coal Mining Tech., Ergonomics & Policy 1989; Am. Min. Congr, Wash,dc, 1989, PP. 25-40