Abstract: A method for anchoring a bolt, having a helical channel adjacent the end thereof, in a bore hole in a rock-like structure, especially in anchoring of mine roof bolts, wherein a resin package is first inserted into the bore hole and the bolt is inserted and rotated in a direction opposite the direction of the helical channel to fragment the resin package and mix the resin, and prior to complete hardening of the resin, but after substantial hardening thereof, the bolt is rotated in the opposite direction while the resin completely hardens to anchor the bolt in the rock-like structure.

Abstract: A mine roof support plate bolt formed from a concrete reinforcing rod has a head and flange at one end and a groove at the other end thereof, the groove forming opposed cutting edges at that end of the rod, and a counterclockwise, arcuate, helical channel in the section of the rod adjacent said other end, the counterclockwise, helical channel communicating with the groove, such that good mixing of resin adapted to secure the bolt in a bore hole is effected, while the cutting edges enable lengthening of the bore hole in instances where the rod would otherwise not pull the support plate flush with the roof structure.