在露天矿含水岩层中进行爆破工作的特点是昂贵防水炸药的用量大、炮孔装药工艺复杂和拒爆数量增多。穿爆工作费用上升50～64％。迄今,在进行穿孔爆破工作和评价矿床的水文地质情况时对于矿床开采中引起的变化考虑得不够全面。波罗的海沿岸矿区各磷矿床水文地质共同的特征是:存在被弱透水岩层分隔的两相 Blasting work in the open-pit mine’s water-bearing rock formations is characterized by the large amount of expensive waterproof explosives, the complex process of blasting and the increased number of rejects. The work cost of wearing explosion increased by 50 ~ 64%. To date, changes in the mineral deposits have not been adequately considered in the conduct of perforation blasting and in assessing the hydrogeological conditions of the deposit. The common feature of the hydrogeology of phosphate deposits in the Baltic coast is that there are two phases separated by weakly permeable rock formations