甘肃省石硐沟银多金属矿床富集规律及找矿前景

Analysis of ore enrichment regularity and the prospecting foreground for Shidonggou silver polymetallic deposit in Gansu Province

石硐沟银多金属矿床位于北祁连加里东造山带西段,与塔尔沟大型钨矿床为同一成矿系列。矿区出露地层主要为前长城系北大河群,为一套中-深变质岩系;石硐沟断裂(F1)为区内主要控矿断裂,矿带(体)严格受其控制;矿体呈似层状,含矿岩石为角砾状硅化灰岩;银矿化与铅矿化呈正相关,与锌矿化呈一定负相关。矿体品位及厚度均具膨大缩小,分段富集特点,矿体总体向东倾伏。矿带向东西均有延伸,沿断裂破碎带找矿前景广阔。矿体深部及东西延伸方向尚未控制到矿体边界,向东矿体延伸空间较大。沟系土壤异常指示效果明显,异常向西未封闭,西部具有较大的找矿前景。

Summary ：Shidonggou silver polymetallic deposit is located at the west Caledonian orogenic zone in north Qilian, which is belonged to the identical mineralization series with Taergou large-scale tungsten deposit. The strata in the mining area are the Pre-Changchengian Beidahe group, which is a set of middlekata metamorphism rocks. Shidonggou fault （F1） is one of the major controlling faults in the area. It strictly controls the ore belt. The ore body resembles layered. The orebearing rock is brecciated and silicified limestone. The silver mineralization is positively related to the lead mineralization, and negatively related to the zinc mineralization. The orebody grade and thickness show the characteristics of expanding, reduction, and partition concentration. The ore body plunges to the east. The ore belt extends along the EW direction. The prospecting prospect is broad along the fault zone. The ore body boundary is not yet controlled in the deposit depth portion and along the EW extending direction. The prospecting space is large in the east mine field. The indication effect of ditch and soil anomaly is obvious. It is exceptionally open to the west. The prospecting prospect is big in the west area.