Research On Occurrence State Of Gold In Disseminate Gold Deposit In Guizhou

Qianxinan gold ore is on the southwestern margin of the Yangtze block in the tectonic,bound southwest Sanjiang fold belt,adjacent to the South and the South China plate,belongs to the continental type crust tectonic domain Youjiang ancient rift.The area controlled by Xingren Anlong tectonic division?III?,the exposed stratum is mainly Devonian to triassic.Mount Emei basalt altered rocks in Permian controlled the deposit.In this paper occurrence state of gold in disseminated gold deposit in Guizhou Getang were systemed researched on the basis of a large number of domestic and foreign literature consulting,chemical analysis,XRD,microscope,SEM,EPMA and chemical phase analysis.The main results are as follows:1.Classification of ore types into two types of primary ores and oxidized ores.The oxidized ore minerals are quartz,pyrite,hematite,calcite,clay minerals,etc.The main minerals of the primary ore are quartz,pyrite,calcite,and clay minerals,etc.The main chemical compositions of these two types of ore are Al₂O₃,SiO₂,Fe₂O₃,FeO,CaO,and the other elements are very low.2.The occurrence of gold in ore gold mainly:?1?gold minerals in natural existence,is wrapped in the interior of the carbonate calcite and adsorption in quartz and calcite in the micro fracture;?2?silver gold minerals,adsorbed on clay minerals and calcite micro fracture;?3?gold element may exist in the adsorption of gold and lattice gold of hematite,calcite,on the surface clay minerals?kaolinite and illite?and quartz surface,micro fracture and crystal lattice in;?4?the gold is in the pyrite lattice by isomorphism.3.Equilibrium coefficient of the chemical phase analysis of gold was less than1%and the result was available.Gold in the primary ore mainly exists by quartz and silicate inclusion gold,carbonate inclusion gold and bara and semi bare state,which accounted for 53.92%,22.71%and 18.22%,the three forms of gold golden total94.85%.Gold in the oxidized ore mainly exists as quartz and silicate inclusion gold,carbonate inclusion gold and bara and semi bare state state,which accounted for50.00%,33.98%,8.07%.The three forms of gold golden total 92.05%.4.Combined with the modern instrumental analysis and chemical phase analysis,gold mainly adsorbed on quartz and silicate minerals,carbonate minerals?calcite?surface,micro cracks and crystal lattice as adsorption gold.The gold is in the pyrite lattice by isomorphism.Natural gold minerals in the oxidized ore is wrapped in quartz,calcite or absorbing in between quartz and calcite in the micro fracture and the adsorbed between calcite and clay minerals and micro fissures in the electrum.At the same time,there is a silver gold mineral in the micro cracks between calcite and clay minerals.