安庆月山铜钼矿床金的赋存状态与分布规律研究

STUDY ON THE RESIDENCE STATE AND DISTRIBUTION REGULARITIES OF GOLD IN YUESHAN Cu Mo DEPOSIT, ANQING , WESTERN ANHUI PROVINCE

应用光学显微镜、化学分析、电子探针和质子探针等多种分析研究方法，系统地研究了安庆月山铜（钼）矿区铜牛井矿床不同类型的铜矿石中金的赋存状态。研究结果表明，金主要以独立矿物含银自然金、银金矿和自然金等赋存于石英脉型铜矿石、铜方矿化岩石（脉）型及闪长岩型铜矿石中，与之共生的矿物为黄铜矿、斑铜矿、辉铜矿、辉钼矿和石英等；矿石中金的平均含量为０３ｇ／ｔ，具有综合利用价值。金银系列矿物中以含银自然金为主，粒度一般为０．１５～０３０ｍｍ，大者０５ｍｍ以上。金的矿化随着深度的增加而有明显的减弱趋势，同一水平面则有西低东高的趋向，但水平上的变化幅度比垂直方向小得多。这不仅为矿床伴生金的选冶工作提供了依据，而且对提高矿山经济效益及增加生产附加值，有着重要意义。

In this paper the forms of existence and distribution regularities of gold in Yueshan Cu Mo ore deposit, Anqing, western Anhui Province, are studied by means of optical microscope, chemical analysis, electron microprobe, and proton and nuclear microprobes in PIXE system etc It shows that the gold in the copper deposit mainly occurs in micro grained native gold of independent minerals including silver bearing gold, silver gold and natural gold, which are concentrated in quartz vein type copper ore, copper bearing calcite veins and diorite type copper ore They are associated with chalcopyrite, pyrite, bornite, molybdenite and quartz The gold silver mineral series is mainly composed of native gold whose grains range from 0 15 to 0 30 mm, with a maximum size of more than 0 5 mm The intensity of gold mineralization varies with the depth of the ore body: the gold grade in the upper part is higher than that of the lower, whereas the degree of variation of gold grade in the horizontal direction is less than in the vertical direction This study provides an evidence for the comprehensive use of the accompanying gold in the Cu Mo ore deposit in this region.