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上向台阶式回采
在金属矿山广泛采用的采掘方法之一。即从巷道顶板开始,按台阶形状顺次采掘矿石的一种方法。上向台阶式回采,俗称仰挖台阶式回采和倒台阶式回采,有水平钻孔和垂直〈或有少许角度〉钻孔两种方式,也称上向式采矿法
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