紫金山金矿揭顶定向抛掷硐室大爆破

DIRECTIONAL THROW UNCOVERING COYOTE BLASTING AT ZIJINSHAN GOLD MINE

介绍了１９９７年１２月１７日在福建上杭紫金山金矿成功地进行的一次以条形药包为主、条形药包与集中药包相结合的露天剥离定向抛掷大爆破。该次爆破实际总装药量为１０３５．７９２ｔ，一次爆破量为１２５万ｍ３，抛掷方量７８万ｍ３，抛掷率超过６２％。爆后岩石破碎均匀、表面基本无大块，爆区山体标高降低、原最高点降低３５ｍ；高于最低起爆水平３５０ｍ、离爆破中心４５０ｍ的上杭县电视转播站等爆区周围建（构）筑物未受损伤，达到了预期目标。

A sucessful directional throw unvovering coyote blasting in Zijinshan Gold Mine,Shanghang,Fujian Province on Dec.17,1997 is introduced in this paper.The charge pattern of this blasting is linear charge and supplemented with point charge.The amount of explosive is 1035792kg.The volume of rock and soil in this blastig is 1250000m 3 with a throw volume of 780000 3 rock.The throw ratio is over 62%.There is little block on the surface of the muckpile and the size of the rock fragmentatio is even.The level of blasting area is reduced by over 35m.Neither the TV relay station,which is 350m above the lowest blasting level and 450m far from the center of blasting area of Shanghang County nor the other nearby buildings are damaged.The desired results have been achieved.