In many porphyry copper deposits, additional enrichment of the metal has been caused by surficial weathering.
在许多斑岩铜矿矿床中，地表风化使得金属铜进一步富集。
2
The gold enrichment is closely connected with metal sulfide (or arsenide). And arsenopyrite is the main gold-bearing mineral.
金的富集与金属硫(砷)化物关系密切，毒砂是其主要载金矿物。
3
Because of its special cell wall structure, high capacity of heavy metal-enrichment, and easy to desorption, algae has been considered as an ideal biological adsorbent.