Mineral processing and extractive metallurgy of gold ores are largely driven by their grade,reserve and gold deportment.The concentration of gold in the crust is extremely low and highly variable,resulting ore variability in many gold deposits.More importantly,gold in a deposit may occur in two or three forms,making gold ore processing extremely challenging.The goal of gold geometallurgy is to reduce and minimize the technical risk through representative sampling and subsequent mineralogical and metallurgical testwork.It is a technique to document variability within an orebody and quantify the impact of many factors including geology and mineralogy on grinding, flotation,leaching and metal recovery processes.

Gold in the Jinya Carlin-type deposit, assaying 6.27 g/t Au, was characterized using a comprehensive mineralogical and analytical approach which includes optical microscopy and several advanced microbeam techniques. Each gold carrier was quantified independently. Gold in the Jinya ore occurred as microscopic gold and submicroscopic gold. Submicroscopic gold, primarily in the form of solid solution gold, was carried mainly by arsenopyrite (accounting for 77% of the gold assay), and to a lesser extent (~16%) in arsenic-rich fine-grained and microcrystalline pyrite. Native gold accounted for 6% of the gold assay. Gold carried in cinnabar and rock minerals is insignificant . Gold deportment shows that (1) arsenopyritization and pyritization can be used as indication of mineralizatio n for the further exploration in the Jinya district, and (2) gold in sulfide s is not amenable to direct cyanidation, but can be recovered by flotation of a sulfide concentrate and then cyanidation with a pretreatment process.

The mineralogy of two gold deposits in southwestern China, which contain gold entirely in the form of microscopic or submicroscopic grains or inclusions, is examined. They contain refractory or low-grade ores similar in type to those near Carlin, Nevada. Mineralogical studies of ore samples from the two deposits (e.g., proton microprobe analysis, scanning electron microscope analysis, electron microprobe analysis, X-ray diffraction studies, ore microscopy) indicate that the predominant gold-bearing minerals are pyrite (Dongbeizhai deposit) and arsenopyrite and pyrite (Jinya deposit). Gold in the two deposits is closely correlated with As, S., and Fe.

海西中期北疆地区地壳运动强烈,随着陆壳的开合,形成了大面积的花岗岩类。在阿拉套山南坡,沿博乐钨锡成矿带自东向西分布着孔吾萨依、乌拉斯坦、祖鲁洪、喀孜别克和查干浑迪等岩体。其中,西部的祖鲁洪、喀孜别克和查干浑迪花岗岩体与该区的石英脉型、云英岩型和绿泥石型钨、锡矿化有着直接的关系。本文对查干浑迪花岗岩体进行了Sm-Nd,Rb-Sr和O同位素研究,确定了岩体的形成时代,探讨了岩体的成因和成岩物质的来源。

自卡林型金矿发现以来,微细粒金的赋存状态一直是矿物学和矿床学研究的重点之一。由于微细粒金主要呈显微金和超显微金存在,不但肉眼难以见到,在光学显微镜下也很难发现,给赋存状态研究造成很大困难,直接影响到矿床的评价、勘探及选冶工艺的确定。本文首

The occurrence of micrograined gold has been a key subject in research in mineralogy and ore deposits since the Carlin-type gold deposit was found. The new microbeam analysis techniques involving scanning proton microproby(SPM) and scanning electron microscopy (SEM) used for investigation of gold occurrence in the micrograined gold deposit from Jinya, Guangxi Province are first reported here. The Jinya micrograined gold deposit, located at Fengshan County, the northwest part

滇、黔、桂金三角是我国重要的微细粒金矿床分布区。作者在研究该区金牙微细粒金矿床中金的賦存状态时首次发现了含铂汞金矿、汞金矿和铂金矿,这对金牙金矿床的矿物学和金的提取工艺研究以及矿床成因探讨都有重要意义。

> I. INTRODUCTION Based on the proton induced X-ray emission (PIXE) technique, microbeam PIXE is a new technique of micro-analysis, its detection limit is 10～2 times lower than that of an electron microprobe. It is very useful in trace element measurements of geological samples,

新疆北部博乐钨锡成矿带上分布着若干大小不等的花岗岩体,它们与成矿带内的钨、锡多金属矿床在时间上和空间上都有着密切的联系。祖鲁洪岩体就是其中的一个。本文着重介绍岩体的Sr、O同位素和稀土元素研究结果,并根据这些结果对岩体的成因进行了探讨。

建立在PIXE（质子激发X射线荧光分析）技术基础上的微米PIXE技术是继电子微探针之后的一种新的微束分析技术,它的探测限可优于电子探针10~2倍。对地质样品中痕量元素的测定,对矿物学、矿床学和地球化学领域矿物成分的微结构研究有重要意义。可以获得单