湘西沃溪金矿床矿石矿物学特征及深部找矿意义

Mineralogical characteristics and their implications for deep prospecting of the Woxi gold deposit in western Hunan,China

借助电子探针分析技术,对沃溪矿床V3矿脉深部(29中段)矿体进行了矿石矿物学观察和分析,发现深部矿体自然金中Ag、Sb、Pb、Bi等杂质元素的含量明显比浅部(24中段以上)自然金相应组分的含量偏高,深部自然金的成色(≤995)比浅部自然金的成色(≥999)明显偏低;深部矿体矿石中发育辉锑矿、黄铁矿、闪锌矿、黄铜矿、黝铜矿、硫锑矿、车轮矿等矿物,形成明显比浅部矿体组成复杂的矿物组合,显示矿床深部发育Au-Pb-Zn-Bi±Cu的矿化作用。上述表明:沃溪矿床深部可能发育具Au-Pb-Zn-Bi±Cu等元素组合的新矿体。它不同于浅部的W-Sb-Au元素组合的特征。因而深部找矿工作应多注重Au-Pb-Zn-Bi±Cu多元素矿床。

Using electronic microprobe, the mineralogical study of samples from level 29 of V3 vein of the Woxi deposit in western Hunan province shows that the ore minerals include major native gold, stibnite, sphalerite and Sb-Pb mineral phase. The mineralogical assemblage of the deep ore is more complicated than those of the shallow levels. The native gold from level 29 contains 0.52% Ag, 1.42% Sb, 4.48% Pb and 5.65% Bi in average, respectively, much higher than those from shallow places （above 24 flat）. The gold fineness is 〈995 at deep, but 〉 999 at shallow. All the facts above show that the position beneath the present mining levels is potential for Au- Pb-Zn- Bi±Cu poly-metalic orebodies; and that future deep prospecting should pay attention to poly-metallic mineralization.