For the gently dipping medium-to-thick orebody in Dazhuangzi Gold Mine, the room-and-pillar two step mining with backfilling method was tested and proved a success.

• 大庄子金矿的矿体属于缓倾斜中厚矿体,试验采用矿房矿柱两步回采嗣后充填采空区的方法开采,并取得了成功。