界河金矿4号矿体属于矿岩很破碎、极易冒落、金属品位高的难采矿体。以往矿山用上向水平分层废石充填法开采时,在安全、资源回收上存在较大问题。因而改用下向胶结充填法。首先进行试验回采,完善回采工艺后再全面推广应用。试验中采用了预埋钢筒形成充填小井的新方法,首创工艺简单实用的充填接顶指示装置。由于使用下向胶结充填法,提高了回采安全性及资源回收率,使损失率降至8％,贫化率降至5％。 Boundary River gold ore body No. 4 ore rock is very fragmented, easy to fall, difficult to mining high-grade metal body. In the past, mines were used to level the horizontal waste rock fill method mining, there is a big problem in safety and resource recovery. So use the next to cementing filling method. First, test and recovery, improve the mining process and then promote the full application. In the experiment, a new method of filling the steel cylinder to form a filling small hole was adopted, and a simple and practical filling top indicating device with a simple process was pioneered. Due to the use of downdraft filling method, the recovery safety and resource recovery rate have been enhanced, reducing the loss rate to 8% and reducing the rate to 5%.