V.RATUSHNYI METHOD FOR DESTRUCTION OF MASSIF IN CONTACT ZONE OF POWERFUL STEEP SEAMS OF ROCK AND ORE

摘要

A method for blast destruction of massif in contact zone of powerful steep seams of rock and ore includes multi-row hole drilling around of ledge block with cutting wells along its front and at sections of bedding of seams of rock and ore. In the block of ledge one first drills row of inclined contour wells with placement of those near the surface parallel to surface of contact of seams of rock and ore with permitted deflections from respective position not larger than 1.5 m.