可可托海矿床第三号矿脉露天采矿埸地下水深孔排水疏干工程,从76年开始施工到79年底基本建成,历时四年。工程包括清扫和利用的旧疏干孔在内共建成排水泵站12座,形成最终排水能力为18300—21200m~3/昼夜,为予计矿坑总涌水量12760m~3/昼夜的143—166％,最终疏干试验已将露天采矿埸地下水位降低至1124m水平,后因渠道漏水,试验只进行了八天便被迫中断,但停泵前每天仍以0.8—1.0m的速度在继续下降,显示了良好的疏干效果,它证明深孔排水予先疏干这一新技术在可可托海矿区是适用的,前景是光明的。和冶金部下达的控制指标相比,本项疏干工程构造勘探的找孔准确率由50％提高到95.2％,连同节约的疏干孔工程量,共可节省基建投资77.27万元(表1)。予计开采至1096米水平时的年经营费为393740元,每立方米排水费用0.0845元/m~3,每吨矿石排水费1.591元/ Kai Tuo Tuo ore deposit No. 3 mine open-pit mining 埸 deep hole drainage dredging works, from 76 construction to the end of 79 basically completed, which lasted four years. In the project, 12 drainage pumping stations are built, including the old drainage holes for cleaning and utilization. The final drainage capacity is 18300-21200m ~ 3 / day and night. In order to calculate the total water inflow of 12760m ~ 3 / 143-166% The final dredging test has reduced the groundwater level of the open pit mine to 1124m level and leaked water through the canal. The experiment was suspended for only eight days, but it continued to decline at a speed of 0.8-1.0m per day prior to stopping the pump. Shows a good drainage effect, which proves that the new technology of deep-hole drainage pre-drainage is applicable in the Koktohai Basin and the prospect is bright. Compared with the control targets issued by the Ministry of Metallurgy, the accuracy of the prospecting holes for structural exploration in this project is raised from 50% to 95.2%, and the total amount of drainage holes saved can save a total of 777,200 yuan in infrastructure investment (Table 1 ). It is estimated that the annual operating expense when mining to the level of 1096 meters is 393,740 yuan, the drainage fee per cubic meter is 0.0845 yuan / m ~ 3, the discharge fee per ton of ore is 1.591 yuan /