Discussion On Ore Characters And Process Of The Gold Mine In Danba Yanzi Gou Of Sichuan Provice

Danba yanzi gou micro-disseminated gold deposit is located in Danba County, Sichuan Province, which had found in the North west region of the last century, the deposit occurs in the C-rich phyllite, carbonaceous carbonatite and aleurolite where they are the fourth group of 6-7 layer wei guan qun in Devonian. The deposit is relatively large reserves, ore bodies are simple, that changes in thickness and grade of relatively stable.Ore body occurs carbonaceous stratum,with a single large vein, a group of veins, dense fine (network) rete mirabile, the ore types by way of mineralization is divided into sedimentary minerals, hydrothermal minerals, power-type ore supergene weathering ore.There are two types ,one is steep quartz vein gold-bearing, the other type is gentle dip-type ore carbonaceous slate, ore bodies are controlled with position and a lot of structure.The work detail study in characteristics of the ore deposits (including ore type, chemical composition, ore fabrics, etc.) and mineralization periods, by based on the work of predecessors, for yanzigou gold deposit as the research object, by used the combination of macro and micro methods. (1) There are sedimentary ore, hydrothermal minerals, dynamic role in the formation of ore and supergene weathering of ore; (2) Not only contain ore the main components of Au, Ag, Fe, Cu, but also contains a small amount of Zn, Sb, As, Bi and other elements; (3) The main ore minerals are native gold metal, silver gold, pyrite, chalcopyrite, sphalerite, galena; (4) The main structure of ores are disseminated constructed structure, block structure, vein structure, brecciated structure, laminated structure, plaque hybrid-like structure, honeycomb structure, earthy structure, Ore texture mainly is structure of the crystal structure, account structure, biological structures, fragmentation deformation structure; (5)There are three existing state of gold ,inclusions, fissures and intergranule; the silver mainly in isomorphic and independent silver minerals.(6) According to the geological characteristics of deposits, Ore fabric , ore type, mineral composition, wall rock alteration and mineral relationship of alternate and interspersed, we can be divided into sedimentary mineralization, hydrothermal mineralization and supergene ore-forming 3 periods in Danba County yanzigou gold deposit. Hydrothermal metallogenic epoch was considered the important period, it can be divided into three stages according to the mineral composition relationship.By finding out the ore of elements characteristics and grade and minerals in a useful combination of features and characteristics of mineral grain size and mosaic types, that play a decisive role in post-processing methods and processing of ore selection processes, which of determining the ore be make use and processing costs ,which of information the same type of gold deposits in the region provided the basis, it has important economic significance and theoretical significance.