青海省满丈岗金矿床物质组分及金赋存状态分析

Material components and occurrence states of gold in the Manzhanggang deposit,Qinghai Province

满丈岗金矿床是近几年青海省新发现的浅成低温热液型金矿床。在野外工作的基础上,采用光薄片鉴定、化学成分分析、电子探针分析、物相分析等技术手段,查明了该矿床主要具有石英脉型、蚀变凝灰岩型、破碎蚀变岩型3种矿石类型,矿石结构主要有斑状结构、碎裂结构、自形半自形结构、他形粒状结构等,矿石构造主要有块状构造、浸染状构造,次为脉状、网脉状构造等。自然金多以粒间金形式分布,粒度主要集中在0.15~0.074 mm和0.04~0.01 mm两个粒级,其分布率分别为38.99%和42.05%,易单体解离,利于其选矿富集。原矿在磨矿细度-0.074 mm占60.55%时进行尼尔森重选,尾矿进行无氰浸出,最终金总回收率可达98.63%。

Manzhanggang gold deposit is epithermal gold deposit newly discovered in recent years, in Qinghai Province. Based on field work and used of polished thin section identify,chemical composition analysis, electron probing analysis,phase analysis, et al, think of the deposit has quartz veins, altered tuff type, broken altered rock type three ore types. Ore structure have porphyritic texture,eataelastie texture,idiomorphie-hypidiomorphie texture,allotriomorphie-granular texture, and ore structure have massive structure,impregnation structure et al.Natural gold distribution of intergranular gold, granularity concentrated on -0.15 ＋0.074 mm and -0.04＋ 0.01 mm, the distribution law were 38.99% and 42.05%, easy to monomer dissociation and Conducive to its benefieiation enrichment. Used Nelson re-election if ore grinding fineness -0.074 mm when accounting for 60.55%, no cyanide leach to tailings. Finaliy, The total gold recovery rate of 98.63%.