Mine Sealing by Pneumatic Stowing in Ohio.
Pres at Abandoned Min Reclam Symp Soil Conerv Soc Am St Clairsville 1982 :14 pages
The Bureau of Mines tested a method of constructing mine seals using pneumatic stowing to backfill six abandoned mine openings in Ohio. During the stowing, well-graded aggregate with sufficient fines was ejected from a nozzle at high velocity, creating a high-compaction fill upon impact. The method is safer and faster than conventional methods, it is cost competitive, and it eliminates or reduces the exposure of workers to possible hazards, since they can be kept outside the openings. The technique may be used for sealing abandoned and active mine openings, even in remote locations and during severe weather conditions.
Pres.at Abandoned Min. Reclam. Symp., Soil Conerv. Soc. Am., St. Clairsville, 1982, 10-1--10-14