Abstract: A system for filling a spatial volume below the earth's surfaces with a dry fill material by supplying the dry fill to a borehole at the surfaces, the fill falling generally vertically through the borehole so as to exit vertically at an exit thereof into the spatial volume. An ejector is positioned below the exit and provides a high velocity air stream which intercepts the dry fill as it exits from the borehole so as to direct the fill in a generally horizontal direction away from the borehole into the spatial volume.

Abstract: An injector with a pair of counter-rotating screws that are mounted along parallel axes in cylindrical chambers formed in a housing are driven in synchronism by a driver. A series of plates are slidably received in a track provided in the housing and are fitted between successive flights of the screws. The plates are carried by the screws in an endless path within the housing. Pockets formed by the plates, screw flights and chamber walls carry particulate solids from an inlet port to a discharge port of the housing for injection into a pressurized hydraulic transport line.