白牛厂银多金属矿床银的赋存形式及银矿物特征

矿床产在燕山期花岗岩外接触带，受北西向层间滑动构造破碎带控制。含矿热液沿构造破碎带充填，形成规模很大的、连续性极好的、银锡铅锌均分别达到大型的复合矿体。成矿具多成因、多期、多阶段的特点。银主要呈银矿物形式存在，银矿物又主要是多阶段的银锑－银铜锑－银铅锑等硫盐矿物。银矿物粒度很细，多呈包嵌形式存在，与方铅矿关系特别密切。经矿相配合能谱系统研究，辅以部分单矿物分析，初步查明其分布、富集、相互关系及矿物物性特征。

Modes of Occurrence of Silver and Characteristics of Silver Minerals in the Bainiuchang Silver-Polymetallic Deposit

The ore deposit occurs at the exocontact zone of Yanshanian granite,controlled by a NW-trending interlayer-gliding structural shatter zone.Ore-bearing hydrothermal solutions filled along the structural shatter zone,forming large -scale and well-continued composite orebodies,wity silver,tin,lead and zine all reaching the reserves of large deposits,The ore-forming process exhi-bits polygenetic,multiphase and polystage features,Silver mainly occurs as silver minerals which are sulfosalt minerals of silver-antimony,silver-copper-antimony,and silver-lead -antimony,Silver minerals are extremely fine-grained and exist mostly in the mosaic form,associated especially closely wity galena,Through ore microscopic and systematic energy spectral srudies wity the help of individual mineral analysis,the authors have preliminarily found out the distribution,enrichment,interrelationship and physical properties of these silver minerals.