Methods And Their Practice Of The Study For Structural Ore-Controlling Characteristics At Covered Area In The Middle-south Part Of Da Hinggan Mountains

With the difficulty of prospecting constant increasing, multidisciplinary, more joint research technique has become a consensus at the study of Large-scale structure of the ore-control characteristics and buried ore body positioning forecast. However, how effectively modern geophysical technology can use for the large-scale structure of ore-control study and guide the prospecting work is of great theoretical and practical significance.Through the applying of VLF-EM and EH4 in Chaihulanzi gold deposit and Nasitai lead-zinc deposit and Haerchulutu mine in the Middle-Southern Part of Da Hinggan Mountains, this paper carry out the study of large-scale structure of ore-control ,The conclusions are as follows:1,For the structure-controlled (especially fracture) metallic mineralizing system, VLF-EM is a very effective and efficient means of geophysical scanning, it can the planar spread and shallow attitude of the hidden ore-controlling structure. EH4 can reflect the attitude and combination of structure in depth in high accuracy. The application of VLF and EH4 in study of ore-controlling structure features:1) The features of attitude of structural-mineralizing zone in coverage area;2) The pattern features of ore-controlling structure in coverage area;3) The ore-controlling regularity by compounding of structure and the prediction of prospecting in favorable position.2,In terms of study of ore-controlling structure in coverage area, the paper proposes to use VLF and EH4 to study ore-controlling features of structure. The steps are as follow:①field exploration and analysis on geological data;②Based on the understanding of the structure geology and mineralization of the field, screening the most favorable section of the mine;③VLF-EM scanning, detect the buried mineralization-structure alteration zone planar distribution and the shallow occurrence;④Highlights focus on prospecting segments;⑤EH4 deep ore-controlling structure predication;⑥Design verification.3,The study results show that the combination of VLF-EM and EH4 in the coverage of Middle-South Da Hingan Mountains ore-controlling structures study, is a very effective method, especially for structure-controlling deposit, i.e. hydrothermal deposit and skarn deposit. In carrying out this combination of tectonic-mineralized zone space positioning, ore-controlling structures basic pattern analysis and effective prospecting site forecasts, application results are worth further promotion.