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富湾大型银矿床主要产在下石炭统灰岩与上三叠统页岩断层不整合面下的硅质岩及灰岩中，矿化多为脉状。银矿体铅同位素组成特征和下伏地层有一定的差异，硫同位素组成均一，脉状银矿化石英脉石英Rb－Sr等时线年龄为（65±2．5）Ma。该矿床主要是后期改造作用形成的。
The large-scale silver deposit in the Fuwan Bay is mainly produced in cherts and limestones under the unconformity between the Lower Carboniferous limestone and the Upper Triassic shale, and the mineralization is mostly vein-shaped. The lead isotopic compositions of the silver ore body are different from those of the underlying strata. The composition of sulfur isotopes is homogeneous. The Rb-Sr isochron age of veins of fossil vein quartz veins is (65 ± 2.5) Ma. The deposit is mainly formed by the later transformation.