安徽白岭金矿金的赋存状态研究

白岭金矿位于下扬子台坳、长江褶断隆起带中段。金矿体赋存于三叠系中统铜头尖组中，矿体形态呈不规则脉状。矿石类型主要有以含金褐铁矿为主的氧化矿石和以含金黄铁矿为主的原生矿石两大类。载金矿物主要有黄铁矿、褐铁矿、石英、伊利石、黄铜矿等。通过矿相鉴定，单矿物含金分析、物相分析、多点分析、电子探针分析等，查明了金的赋存状态。金矿物以自然金为主，其次为银金矿。金的粒度较细，主要为中细粒显微金。金的嵌布类型有包体金、晶隙金、裂隙金。金的成色较高，平均为906．5。金主要呈矿物态存在。

A Study on Mode of Occurrence of Gold in the Bailing Gold Deposit, Anhui province

The Bailing gold deposit is located in the middle part of the Changjiang fault-fold upwarping zone within the Lower Yangtze syneclise. The gold orebodies, in the irregular veinlike form, occurs in Middle Triassic Tongtoujian Formation. There are two major ore types, namely, oxidized ore dominated by gold -bearing limonite and primary ore dominated by gold-bearing pyrite. The average gold grade of the oxidized ore is 7.8 g/t, whereas that of the primary ore is 7.98 g/t, The gold-bearing minerals are mainly pyrite, limonite, quartz, illite, chalcopyrite etc. By means of ore microscopy, gold analysis of individual minerals, phase analysis, poly-spot analysis and electron microprobe analysis, we have identified the mode of occurrence of gold. Gold minerals are mainly native gold and, less commonly, electrum. Gold is rather fine in granulity and comprises mainly medium-or fine-grained micro-gold. The mosaic types of gold include inclusion gold, gold in intercbystalline pore and fissure gold. Gold has quite high fineness (906.5 on the average) and exists chiefly as minerals.