西藏弄如日金矿矿石矿物组成、金银赋存状态及工艺特性

Mineral assemblage,gold and silver occurrence and process properties of Nongruri Gold Deposit of Tibet

    摘要
  • 摘要: 通过对西藏弄如日金矿主要矿石类型的岩矿相鉴定,主要组成矿物的扫描电镜/能谱(SEM/EDS)、电子探针(EPMA)和激光消融剥蚀-等离子体-质谱(LA-ICP-MS)分析,研究了该矿床的矿石矿物组成、金的赋存状态和工艺特性.结果表明:金主要以独立金矿物形式呈细粒-微细粒、不规则粒状产于黏土矿物粒间或黏土矿物与石英粒间,成色高(992～996);另有少量以"不可见金"的形式赋存于黄铁矿和毒砂中,"不可见金"对矿石金品位的贡献较小.银主要呈超显微包裹物,赋存于磷酸盐矿物中.在对自然金和载金矿物的粒度统计分析的基础上,对载金矿物在各种类型矿石中的质量分布进行了估算.

     

    Abstract: The mineral assemblage, gold occurrence and characteristics of process mineralogy of Nongruri Gold Deposit were discussed on the basis of geology, petrography, ore microscopy, SEM/EDS, EPMA and LA-ICP-MS results. All native gold, with fine grains and a high fineness of 992 to 996, was found in the clay minerals and between the clay minerals and quartz. The native gold is a dominant occurrence state in this deposit. Minor invisible gold was confirmed in the pyrite and arsenopyrite, and the contribution of invisible gold to the ore grade is small. All the silver was found in the phosphate minerals as micro-enclaved silver. According to the statistic results of native gold and gold-bearing minerals, the mass fractions of different ore types were estimated.

     

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