Mining of gently inclined thin and medium thick ore body with unstableroof 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。
2
Part of ore body in Jinchangyu Gold mine is this kind of gently inclined thin and medium thick ore body with unstableroof, 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。
3
The results of numerical analysis on mined-out area indicate that the roof at mined-out areas is unstable and the rock in the roof is easy to collapse in this mine.