TECHNIQUE OF DEVELOPING A THICK FLAT POTASSIUM-BEARING SEAM WITH ROCK SALT INTERLAYER

摘要

The proposed invention provides to increase efficiency of selective technique for developing thick flat seams containing a rock salt interlayer, due to the workers' labour efficiency, and to reduce energy consumption associated with rock salt transportation. This is achieved by shearer development of a seam in chambers rising in serial stopes over layers, transporting the mineral by mobile machinery, the seam being developed in the chamber in layers, over the entire seam thickness at once, in ascending order, in short vertical stopes, beginning from the lowest layer, the stopes being performed over the layers to maximum value of the shearer operating member; when performing a stope over a rock layer interlayer, the broken salt is placed after the shearer on the ground of the chamber being developed, as a layer whose maximum depth is determined as follows:;h_l=H_k-h_min;where H_k is the chamber height in the stope; h_min is the minimum chamber height to accommodate the extraction equipment. Rock salt broken at the shearer's length from the beginning of the chamber, is placed in a previously developed chamber. Broken rock salt placed after the shearer on the ground of the chamber being developed, is leveled and rammed using mobile machinery. Stopes shall be performed over layers by reciprocating motions of the shearer.