Research On3D Stereo Quantitative Prediction Of Concealed Ore Body In Hongtoushan Copper Mine

In order to ensure the sustainable development of the social economy of our country, it becomes presently an outstanding problem to explore replaceable resources for the crisis mines. On one hand, the crisis mines have the following characteristics:high intensity in mine exploration and development, sufficient accumulation in the firsthand information of geological exploration, development towards the deep and marginal three-dimensional space for evaluation and ore prospecting. On the other hand, many important and basic problems in mineralization and predictive research often involve non-linear problems such as the relationship between the deposits and control factors of mineralization. Therefore, it has become an urgent affair to establish the new methods and theories for evaluating mineral resources in new prospecting innovation systems that are suitable for the crisis mine prospecting in the deep, marginal and peripheral locations.Hongtoushan Copper Mine in Liaoning province is the biggest copper mine base in northeast of china and has become a resource crisis mine with the increasing ore body exploration and usage in surface and in shallow. It is imperative to carry out concealed ore body exploration in the deep, marginal and periphery locations of old mine.Based on the eleventh five-year national science and technology supporting plan "key technology research on deep mining nonferrous metal mine resource reserves increase and efficient utilization", according to the comprehensive research and secondary development and utilization on geological prospecting data, guided by the metallogenic regularity of mining area, this research assimilates modern theories and methods of quantitative appraisal of mineral resources,3D geoscience modeling, spatial date mining, etc, studies and implements the multi-source3D geoscience spatial database, geological entity models and block models, the digital modeling of geological field and the spatial analysis of geological ore-controlling factors which are suitable for the requests of prospecting of replaceable resource. And then, the stereo quantitative3D prediction theory and method of concealed ore body base on SDM is set up. The main research results are as follows: (1) Based on completely collecting and sorting out of existing Hongtoushan Copper Mine geological data, exploration data and geophysical data, the paper analyses the present situation of geological mining data and the characteristics of multi-source3D geology spatial database, and makes integration and unification management on the database; uses3D geological modeling software Surpac to build3D solid and block model of the mining formation, tectonic, known ore body and geophysics, realizing the unified modeling, unified digital expression and storage of the multi-source geological spatial data in3D visualization level, which constitute multi-source3D geological spatial database along with concealed ore body prediction index data and result.(2) With the consideration of ore-controlling actions of geological conditions and based on the multi-source3D geological spatial database, the geological field, which can give a macro description or reflection of the metallogenic physicochemical process's synthetic distribution and ore-controlling effects in geological space, is put forward. The digital modeling method and the spatial analysis method of geological fields are given. Based on the geological field theory above, the distribution fields of mineralization and the ore-controlling effect fields of faults, strata, lithology and geophysical are analyzed, and the ore-formation favorable indexes, which can quantitatively characterize the geological ore-controlling effects, are extracted. Accordingly, the quantitative spatial correlation between the ore-formation favorable indexes and the mineralization indexes is reached, which can maximally reveal the nonlinear mapping relationship from ore-controlling geological factor, prospecting criteria hidden in the comprehensive geological data to mineralization distribution.(3) Through analyzing SDM theories and means, discussing some general SDM means in mineral resource prediction such as fuzzy comprehensive evaluation, analytic hierarchy precess (AHP), grey relational analysis and regression forecasting,3D quantitative metallogenic prediction system of concealed ore body is built based on SDM. In order to conquer the disadvantages of single prediction method, a combination predicting method is put forward according to use the advantages of different methods.(4) The paper comprehensively uses grey system theory, fuzzy mathematical method and analytic hierarchy process to build grey fuzzy hierarchy comprehensive evaluation prediction model (GFAHP). In order to make the factor's weight more effective and accurate, it combines subjective and objective valuation method together, and uses grey relational analysis to analyze the importance between ore-controlling effects. An Improved fuzzy hierarchy analyst method, which changes the comparison matrix to fuzzy consistent matrix, is used to determine the weights, which remedy the defects of subject and object valuation methods. In combination with fuzzy comprehensive evaluation model, GFAHP model is set up for concealed ore body3D quantitative prediction.(5) The mineralization mathematical model that reflects the functional relation between the mineralization variables and the ore-controlling variables is built by using multiple regression model to predict the concealed ore body of Hongtoushan Copper Mine. The predicting results of multiple regression model and GFAHP model are drawn in2D voxel prediction maps according to elevation levels. After comparing the results between predicting models, the three-dimensional prospecting target areas have been delineated and their resource amount have also been calculated.