在各种类型的金属矿床中,缓倾斜薄矿脉分布很广,这类矿床的开采方法一般是全面法。由于损失、贫化率高,同时也由于缺少高效率的采场凿岩和运矿设备,用这种方法开采薄矿脉的效率是很低的。如果贫化率达到70～80％或更高,采矿的附加开支就占矿石总成本的60％以上。只要把贫化率降到 Among various types of metal deposits, the gently inclined thin veins are widely distributed and the mining methods for such deposits are generally comprehensive. Due to the high losses and depletion rates, it is also inefficient to mine thin veins by this method due to the lack of efficient rock drilling and transporting facilities. If the rate of depletion reaches 70-80% or more, additional mining costs account for more than 60% of the total cost of ore. Just reduce the rate of dilution to