Above-ground Demonstration of Pneumatic Stowing Technologies.
NTIS: PB 91-170142 Available for Reference At Bureau Libraries :75 pages
Placement of crushed aggregate by pneumatic methods to provide ground support in abandoned mines was simulated using specially designed discharge assemblies under controlled conditions. These tests were performed to determine the material throw distance, material trajectory, degree of mine roof contact achieved, and in- place density of the stowed material. Pneumatic methods may be used to place fill in over 200 linear ft of limited-height mine opening from a single location by directing the discharge in different directions. Mine roof contact can be achieved by the fill over more than 100 ft of this length. The fill material is placed in a medium dense condition and is estimated to provide a moderate degree of roof support. The pneumatic stowing method is technologically feasible for backfilling abandoned mines, especially in areas where water for hydraulic flushing is in short supply.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 91-170142; Available for Reference At Bureau Libraries