| The dissertation is one part of the science and technology cooperation project between Yunnan province and university/china academy named The Research of Metallogenetic and Mineral Resource Predication in the Deep and Periphery of Gejiu Tin Deposit(2000YK-5) and the natural science foundation project of Yunnan province named The Research of Information Coding and Data Collection of Mining Area CIS (2000D0005Q) . It emphasizes particularly on the mineral resource predication based on GIS in Gejiu ore field.The integrated analysis of ore. resource information seems to be one of the effecive means for optimization of prospecting targets. In the past ,the work was done artificially. Being time-consuming and costly, and could hardly attain the expected result. At present, the processing of data by computer technique has become more powerful, because GIS was developed in recent years. In particularly, GIS has opened up vast prospects for integrated processing of geoscience data and prognosis of ore resources. Being a sort of application software, GIS combines spatial data base management and image analysis into an organic whole, with superposition analysis of spatial data as an important feature.GIS can analyses, extract mineral information, quantitatively assess mineral resources, delineate tractes , construct variables, earn out prospecting targets selection and so on.Gejiu tin district is an old mine with a long exploitation history, and its resources is nearly used up at present. According to the producing scale, it is essential to prospect more resources in the deep and surrounding district. Gaosong ore field is the only field where research degree is low. and here only a No. 10 orebody group is mined. Since 1949 some geological, geochemical and geophysical data and a few drill data of Gaosong ore field have been accumulated, and together with the work of this time, the data are enough to predict mineral resource in this filed .So the research is concentrated on Gaosong ore field. The main results are listed as follow:Through researching on the rock geochemistry and geophysics, concealed granite mass shape, and establishing the models of Sn and Cu mineralizing intension maily with GIS, 8 predication /ones in Gaosong field are found, we point out that No. 1 prospecting target is the most favorable for seeking for concealed orebody: The No.l prospecting target is located on north-east to No.33 orebody group, the connecting position and nearby area of Lutangba fault cutting by Zhayaoku fault.106km2 relief map and 80km2 geologic map of Gejiu ore field are plotted.GIS spatial model for the prognosis of ore resources is set up. Huge data of Gaosong field has been transformed to vector maps automatically in the GIS environment.Geochemical and geophysical data preprocessing, geochemical and geophysical data managing, geochemical and geophysical anomaly analysing, geochemical and geophysical data mapping have been done based on GIS.Since the valuable ore-prospecting information is lapped from original data, and composite geological, geochemical and geophysical anomaly is detected, anomaly inspection and prospecting target optimization have been made based on GIS.The verify program for No. 1 prospecting target has been drawn up based on GIS.Using the GIS. 8 predication /one fields have been found, and one of the predication /ones has been validated with good effect. The nc\\ metallic reserve of tin and copper is 300001 as the predicting result.
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