微细粒浸染型金矿金的赋存状态研究

Study on occurrence of fine grained disseminated deposit gold

某金矿系属于微细粒浸染型矿床 ,矿床赋存于三叠系底部一套粉砂岩与粘土岩组成的沉积岩中 ,物质组成简单 ,自然金是唯一的有用矿物 ,金的颗粒极其微细 ,多数呈非游离不可见金 (超显微粒状金 ) ,主要赋存在毒砂、黄铁矿等硫化物中 ,次为粘土或石英中。常规光学显微镜下鉴定极为困难 ,根据矿石特点 ,采用以选择性溶解试验为主与镜下鉴定的试验相结合的研究方法 ,基本查明了金的赋存状态及工艺特性。解决了单一镜检从半定量、相对含量提高到绝对量的高标准 ,从而为选冶工艺提供更可靠的数据。

A gold deposit which belongs to fine grained disseminated deposit occurs in a set of sedimentary rock which is composed of pulverous sand rock and claystone in the bottom of triassic system.The material composition of the deposit is simple and native gold is the only one kind useful material.The gold grains are extremely fine and most of them are present in a state of non free invisible gold(supermicro grained gold) which mainly occur in sulfide as arsenical pyrite,pyrite etc.and secondery occur in clay and quartz.It is quite difficult for the conventional optical microscope to be used to identify them.Based on ore characteristics,taking selective dissolution experiment as main method and combining it with the application of microscopic appraisal ,the gold occurrence and technological feature are basically ascertained and the appraisal standard is hightened from half quantity of relative content by microscopic appraisal to the high standard of absolute content ,thus providing reliable data for mineral processing and smelting.