Gold occurrence and its indicative significance to mineralization process in Linglong gold district, Jiaodong gold province.

Jiaodong is the largest gold province in China, with a total proven gold reserve exceeding 5000 tons. There are two main mineralization types of gold deposits in Jiaodong area, namely disseminated veinlets-stockwork type mineralization and quartz- sulfide vein type mineralization- Gold mainly occurs in pyrite and quartz in the form of visible gold. The Linglong gold field is located in the north of Zhaoping fault zone, where two types of mineralization ore bodies are developed at the same time. It is an ideal object for studying the gold occurrences. Its research has important scientific significance for selecting appropriate processing and smelting technology and revealing the mineralization and enrichment mechanism of gold. On the basis of detailed field geological survey, through microscopic petrographic observation, electron probe micro-analysis and automated quantitative mineralogical investigation, the occurrences of visible gold in two samples of different mineralization styles in the Linglong gold field in Jiaodong were studied, and the gold mineralization process was discussed. There is no significant difference in the occurrence of gold minerals between the two mineralized types of ores in the Linglong gold field. The gold minerals are electrum and native gold. The gold minerals in the ores of the two mineralized styles include fissure gold, inclusion gold and intergranular gold, which are mainly intergranular gold and inclusion gold. The size of gold minerals is mainly fine grain, and medium to coarse grain gold minerals are occasionally seen in quartz vein. Gold minerals mainly occur in pyrite in the form of independent minerals and associated with chalcopyrite and other sulfides. The fineness of gold minerals in the quartz-pyrite stage is higher than that in the quartz-polysulfides stage, which is affected by the mineralization temperature. The gold fineness of disseminated veinlets-stockwork type samples is higher than that of quartz-sulfide vein type samples, which is due to the difference in the precipitation mechanism of the two mineralization styles