Abstract: A blast hole liner comprised of a single length of waterproof, flattened, longitudinal tubing having an open upper end and a lower end portion terminating in a bottom edge folded about its midpoint with resulting edge halves joined together to define an upwardly open weight pocket. The liner is provided with a transverse seal above the pocket. The latter seal may be located closely adjacent a horizontal crease in the tubing formed by doubling the same back upon itself. In one embodiment, manufacture of the liner from a length of tubing requires no further cutting or slitting of the tube. In another embodiment, a second length of tubing, substantially congruent with the first-mentioned tubing length, may be provided to improve the strength and waterproof nature of the liner and to protect the innermost length of tubing from becoming torn or punctured.

Abstract: The invention relates to a flat storable blast hole liner of the type used for lining blast holes in the mining industry. The liner has a pocket arrangement at its lower end for holding weighting material, the weighted pocket facilitating insertion of the liner, when empty of explosive, into a blast hole. The pocket arrangement comprises two pockets at the bottom of the liner and on opposite sides thereof, either of which may be filled with weighting material. The weighted pocket provides the liner with a generally rounded, bullet-shaped lower end. As the liner is lowered into a blast hole, the pointedness of the lower end tends to center the liner in the hole. Upon reaching the bottom of the hole the weighted pocket sags to one side of the hole and thereby allows later added explosive material to be received at the very bottom of the hole.