| With the increasing difficulties of ore-prospecting, development of Geology and application of new theories and new technologies, forecast of ore-formation is changing from single geology information to multi-geology information., forecast fixed in quality transform into the combination of the quality-quality and fixed-quantity, even the full form of fixed-quantity. Utilizing the information of Geology, Geophysics, Geochemistry and Remote-Sensing, it is a main research direction of the current forecast of ore-formation to realize the analysis and comprehension of the fixed-quality and fixed-quantity.Utilizing the predecessors' material of Laochang mining area in Lancang Lead-deposit, this paper focus on the the analysis and research of the ore-formation. With the support of the software platform of developed GIS, utilizing the theories and technology of Mathgeology, it concludes the ore-composed rules of mining area and achieves the forecast of ore-formation of on the base of new software of analysis and new technology of ore-prospecting. It is made up of four parts as follows.1. Utilizing the poly-statistics software named SPSS, it analyzes datum with different kinds of method from the geochemistry tectonic proto-halo in Laochang mining area, for example, Cluster Analysis, Discriminant Analysis, Correspondence Analysis, Factor Analysis. According to the result of research, it achieves the characteristic of geochemistry, element paragenesis union, geological function, geological period, etc.2. Through the study of Geophysics method, it finds two abnormal low-resistance belts of TEM on the research of the known area. The first TEM abnormal belt ted over the known ore, the second one is located in the margin of crater mechanism on the west of fault 3 , which is distributed with many crossed faults. In the second belt it is made up of 3 abnormal low-resistance area which possess the physics characteristic of low-resistance rate and extraordinary geochemistry tectonic proto-halo. As a result, it is a beneficial place for exploring ore.3. The line structure and ring structure could be drawn from current up-to-date Quick Bird image, the line structure could be used for many kinds of fixed-quantity analysis, for example, equi-density, average direction, outstanding degrees, item quantity. On those research it could be found that information relevant of ore getalong with the line structure, especially most mining pot in the mining area is located in the crossed district between the line structure and the ring structure.4. On basis of the database of multi-geology information, ten symbol or factor relevant of exploring ore is withdrawn which is made up of North-West fault, beneficial layer stored in orebody, the line structure, etc. The grid unit is divided into a square which spread 100 meter, many information values of variables included of single variable, comprehensive variable and other variables relevant of exploring ore are calculated. According to those information values the border(2.5) is determinated. Four target area for ore-exploring is acquired on the basis of information of exploring ore. After the engineering testing, 74916 tons ore included of sulphuring and oxidizing ore is found in B1 area. |
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