云南者桑金矿矿石特征和金赋存状态研究

Ore characteristics and modes of occurrence of gold in the Zhesang gold deposit, Yunnan

云南者桑金矿区位于我国"滇黔桂"金三角卡林型金矿分布区,属微细浸染型金矿。通过对矿石特征和金赋存状态研究,金主要以显微、超显微自然金形式赋存于黄铁矿、毒砂等金属硫化物或其氧化物中,其次是分布在硅酸盐、碳酸盐等脉石矿物中。硫化矿石中硫化物含金量应占金总量的50%以上,部分金赋存在绢云母、脉石英及碳酸盐等脉石矿物中,含量占20%±,硅酸盐矿物中包裹金含量占20%±,极少部分金以游离金形式存在,含量占总金的10%以内;若为氧化矿则金主要为游离态金,应占总金50%以上,赋存于炭质和粘土矿物中。

Zhesang micro disseminated type gold deposit of Yunnan Province is located in Yunnan-Guizhou-Guangxi ＂golden triangle＂area which hosts a series of Carlin-type gold deposits. Research on the ore characteristics and gold occurrence states shows that gold exists in the form of microscopic or submicroscopic natural gold mainly in metal sulfides or metallic oxides, such as pyrite and arsenopyrite, and secondly in gangue minerals, such as silicate and carbonate. Half of the total gold is included in sulfide ore, with around 20% in some gangue minerals such as sericite, vein quartz and carbonate, around 20% inclusive gold in silicates, and the rest,less than 10%, existing in the form of free gold. In case that the ore is of metallic oxide type, gold exists in the form of free gold in carbon or clay minerals, making up over half of the total gold.