新疆伊宁金山金矿床金的赋存状态

新疆伊宁金山大型金矿床为一典型的浅成低温热液型金矿床。利用显微镜观察、电子探针扫描、物相分析、化学分析等综合分析技术对金矿石中金的赋存状态进行了研究。结果表明,金主要以独立矿物相存在,金的载体矿物主要为黄铁矿、石英和褐铁矿。金矿物以自然金为主(成色为969.6~997.8),含银自然金、银金矿较少。金的嵌布类型有粒间金、包裹金、裂隙金和连生金4种。矿石中自然金的粒度主要以显微微粒金(0.01~0.005mm)为主(约占60%),其次是显微极微粒金(0.005~0.0002mm)(约占26.6%)。尽管显微中粒-细粒金数量不太多,但它对矿石品位和储量来说是重要的。

Gold occurrence of the Jinshan gold deposit, Yining, Xinjiang, China.

The Jinshan gold deposit, occurring in the lower member of Lower Carboniferous Dahalajunshan volcanic clastic formation, is a typical epithermal and large-sized gold deposit in Yining County, Xinjiang. On the basis of detailed field geological survey and systematic laboratory study such as microscope observation, chemical analyses, mineral phase analyses, electron probe scanning, X-ray surface scanning, the occurrence of gold has been determined. The result shows the gold exists mainly as the independent mineral face; the carriers are mainly pyrite, quartz and limonite. The major gold minerals are native gold, the average fineness is from 969.6 to 997.8. The minor argentiferous native gold and electrum are also identified. Gold is embodied as intergranular, inclusion, fissure-filling, and interlocking form. The gold granularity is mainly characterized by micro particulate (0.01~0.005 mm, which accounts for 60%) and extra micro particulate (0.005~0.0002 mm, which accounts for 26.6%). Although the micro medium size and micro fine grained gold is less, however, it is significant to ore grade and total resource.