Therefore, ore prospecting was cast about for source bed.
因此，找矿重点是寻找矿源层。
Two mica schists are considered to be the source bed and host rock of gold.
二云母片岩不仅是矿源层，而且还是赋矿围岩。
The granites not only caused the remobilization of gold but also serve as the secondary source bed.
花岗岩不仅使金活化转移，而且也是第二矿源层。
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