This is subeconomic mineralization related to minor dyke swarms. 这是与小岩脉群有关的准经济意义的矿化。
In addition, dyke exposures, the fault-collapsed karstic system and groundwater also caused some problems during the excavation of the tunnel. 加之，岩脉走向，断层带破裂面以及地下水的存在，在开挖过程中也导致了一些问题。
