极薄矿脈一般都在0.05～0.4公尺以下(很少达0.5公尺),倾角45～90°,围岩很稳定,或者不够稳定,矿脈很稳定或者不稳定,矿脈形状比较规则。如钨、锡、镍、铜、金,以及其它稀有金属都有这种极薄矿脈。目前国内外各矿对这种极薄矿脈,一般都采用下列三种采矿方法:1.分采充填法;2.混采充填法;3.混采留矿法。混采充填法和混采留矿法的主耍缺点,就是贫化率很高,从而造成采矿和加工的绝对金属实收率大 Very thin veins are generally 0.05 to 0.4 meters (less than 0.5 meters), dip 45 ~ 90 °, the rock is stable, or not stable enough, the vein is very stable or unstable, more regular vein shape . Such as tungsten, tin, nickel, copper, gold, and other rare metals have this very thin veins. At present, all kinds of ore at home and abroad for this extremely thin veins, are generally used the following three kinds of mining methods: 1 sub-mining filling method; 2 mixed mining filling method; The main disadvantage of mixed mining and mixed mining is that the rate of depletion is high, resulting in a large absolute metal yield for mining and processing