According to the state of geology structure complex,thin and unstable coal and low mining ratio,six effective ways of raising mining rate are expouned.
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Mining of gently inclined thin and medium thick ore body with unstable roof isregarded as typical hard-to-mine ore body.
顶板不稳定的缓倾斜薄、中厚矿体为典型的难采矿体。
Part of ore body in Jinchangyu Gold mine is this kind of gently inclined thin and medium thick ore body with unstable roof, it is hard to mine.
金厂峪金矿部分顶板不稳定的缓倾斜薄至中厚矿体，其开采难度很大。
Unstable plaque which is vulnerable and prone to rupture has a thin fibrous cap with reduced extracellular matrix.
易破裂的不稳定性斑块中细胞外基质成分减少，斑块的纤维帽较薄，在外力的作用下易于破裂。
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