METHOD FOR DEVELOPMENT OF STEEP IMPACT-RISKY SEAMS Russian patent published in 1997 - IPC

FIELD: mining technology. SUBSTANCE: according to method, simultaneously with advance of cutting face, second split breakthrough is made. Degree of seam section impact-risk is determined and in case of critical level, stoping operations are discontinued. Section of seam from second split breakthrough to cutting face is left as temporary pillar. Then mining of seam from second split breakthrough is renewed along strike. Blast-holes are drilled from preparatory entry in temporary left pillar. Blasting of explosive charges initiates destruction of temporary pillar by forces of rock pressure, and mined coal is released to hauling entry. After complete extraction of coal from temporary pillar, mining is initiated from third split breakthrough up to second cutting face for temporary pillar. This seam mining procedure remains along entire level. EFFECT: high efficiency. 1 cl, 2 dwg