Metallogenic Prediction At Depth In DaXin Gold Deposit, HuNan Province, China

The DaXin gold deposit is located in the Mt.Baima-Mt.Longshan mineralization belt, the belt is an important mineralization belt in which gold, stibium have been formed. The ultra-large type stibium ore deposit in XiKuangShan that is very famous at home and abroad also is located in this mineralization belt. The metal minerals are abundant in this region.This thesis summarizes that clastic altered rock type gold deposit and gold deposit of quartz vein type are two basic gold deposit type in this area, through the research of gold deposit type. The Clastic altered rock type gold deposit is main gold deposit in the research area. The two types of gold deposit are controlled by fault zones. There are some partly mineralized alterations along fault zone, such as the arsenopyrite mineralizes, discoloration, silicification etc. The relation between mineralization and alteration intensity in the fault zone shows positive correlation. The content of arsenopyrite is direct symbol that determines mineralizing intensity, the secondary symbols include stibnite , silicification and discoloration.The gold deposit includes two mineralization periods: hydrothermal mineralization period and exogenic mineralization period. Hydrothermal mineralization period can be divided into three mineralization stages. Early quartz-pyrite stage is the main stage in gold enrichment. Late quartz-pyrite stage is main mineralizing stage, the mineralization is weak in quartz-carbonate rocks stage. Weathering-oxidation is dominated in exogenic mineralization period. The genesis of deposit belongs to medium-low temperature clastic altered rock type.According to the viewpoint that the gold deposit is formed in multi-period and multi-stage, we have studied Au and the elements related with Au such as themacro elements, trace elements, and rare earth elements. Finally we got the elements'background value of the DaXin gold deposit. The vertical zoning sequence and the characteristics of superimposed halos of the gold deposit have also been studied. A method and technology to locate blind ore in the depth and periphery of gold digging has been provided. The elements in DaXin gold deposit include Au, Ag, Cu, Pb, Zn, As, Sb, Co, Mn, Mo. The front halos include: As, Sb, the centrer element of orebody include: Au, Ag, Cu, Pb, Zn, the elements of last halos include: Co, Mn, Mo. The elements that is closely related to mineralization of Au include: As, Sb. Depending on the characteristics of the superimposed halos and the geochemical parameter, an ideal model and the common characteristics of the DaXin gold deposit primary superimposed halos have been summed up. We created the prognostic rules and symbols that can be applied to the search for blind ore deposits. An effect method and technology has been supplied to prospect blind ores and increase the reserves in 5th vein of DaXin gold deposit.