Studies On Au-Polymetallic Deposit Prognosis In Ailaoshan Region

In recent years, mineral resources prospecting faced the new situations. The key work of exploration is how to extract and delineate the new and deep ore-forming information. In this situation, the metallogenic prediction based on synthesis information, which integrated the multi-source geological data, is the best way for the new target lodge and to develop the potential prediction mineral resources. On this method, various prospecting issues can be worked out and turned to the factors of mineralization. As a conclusion, the new targets are delineated so that the multiple types of minerals and develop the new potential minerals.The working area Ailaoshan orogenic belt is located to the central south in Yunnan Province; it is one of the most important gold-polymetallic metallogenic belt on Sanjiang region to the south-west of China. At the same time, it is one of the 16 important metallogenic belt of the new round of prospecting geological work.. Ailaoshan region is transforming to the most important gold-polymetallic mineral survey to the western china.Ailaoshan metallogenic belt experienced strong tectonic movement and frequently magmatic activities and varying metamorphisms. Tectonic belt forming conditions decided the multi-stages of the mineralization. And the favorable metallogenic condition is determined by the geological and the structure condition. The output of various mineral resources is quite rich. Since years before, geologists has focus on the basis geologic research and prospecting in Ailaoshan region. In these years, several large scale deposits have been found such as Mojiang Jinchang gold-nickel, Dianyuan Laowangzhai and Donggualin golden deposits Yuanyang Daping gold-polymetallic deposits. Meanwhile, the resource potential in the study area is huge .Finding the new resource has became the key quest of the mining industry development at present. What's more, it is also the main purpose in this paper.I. Geological information shows that the study area is exposed fully in stratigraphy based on geological study. Lower proterozoic basalts influence much greater than others. The main faults directions are NW and NS. The NS fault cut the NS trend one and do the Ailaoshan metallogenic belt apart. With the regional structural movements there's multi-phase magma activities. Almost golden deposits are distributed in the shallow metamorphic belt and located on the top of secondary faults in Jiujia-Dingmou deep fault.II. Aeromagnetic data is processing by upward extending 40km, 20km, 10km, 5km directions. Extract a 0 value line of vertical second derivative. Interpreting the aeromagnetic data from the magnetic of the study region, the geological conditions of gold mineralization are inferred. Such phenomena before as the structure, strata and intrusive rocks extract the interpretative aeromagnetic of the strata, intrusive rocks and structure. The structure framework is pointed out through the relevance data of different heights. A set of faults of the NW trend are found that control the multi-metal deposits. Delineating the location of buried rock found that the NW trend basement controls the distribution of the basalt cap.III. Processing the 1:200000 hydrographic sediment of study region on F-Krieger method, the concentrated regions of gold-poly metallic elements are point out. 37 gold anomaly areas are delineated. The distribution of the anomaly areas is in groups and belts. Ailaoshan gold mineralization of gold, copper banding the edge of control with the base, generally in the range of development of the basement rock body. Therefore, the contact zone in the North West development of gold and copper anomalies. Lead, zinc, silver and abnormal development of the contact zone in the southeast. To rock as the center, forming asymmetric element zoning characteristics.IV. Based on the theory of synthetic information mineralization prediction, the metallogenic prognosis is worked with the target areas delineated in the study region and statistical units were delineated. There are 7 known units in 37 predicted units. Prediction units have been evaluated through method of the cluster analysis in order to study on the ore-forming favorability. The location prediction of mineral resources is done. No. 3,8,16 are pointed out that the prediction for the most important long-term gold mine area; 20, 24,26,27,28,29,31,36units have some prospect, you can work as a follow-up prospecting focus units; compared with the previous two units, 1,2,4,5,10,12,13,17,18,19,21,23, 34,35units are forming a favorable low, as long-term reserve prospecting units. This can be provided a scientific basis for the next phase of exploration in Ailaoshan region. In the end,a assessment of regionalpotential gold reserve in Ailaoshan region is simulated on MonteCarlo method. It comes to a conclusion that the gold reserve in Ailaoshan region goes biggish potential, and the probability of mineralizing is 1868.1t with 90% percent,4167.4t with 10% percent,3017.7 tons with 50% percent.