Study For Extension Direction Of Vein In Magnetic Mine Based On Panoramic Borehole Images

In the deep strata, because original features are well preserved, so primary structure planes also are well preserved, Such as flow pattern, level, etc, which generally reflect extension direction of vein. In the non-magnetic mines, the Digital Panoramic Borehole Camera System (DPBCS) may directly produce 360°image of the borehole-wall, and obtain detailed information on structure plane occurrence. But the information on structure plane occurrence, obtained by DPBCS, may be affected by magnetic mine, so the DPBCS should be used with other instruments, which are gyro and magnetic instrument, in the magnetic mine. The gyro and magnetic instrument are used to get the angles affected by magnetic mine in borehole, which are used for correcting the information on structure plane occurrences. According to the information corrected, a new method that determines extension direction of vein is discussed. Main research achievements as follows:1. as the DPBCS using magnetic compass to determine drilling position, the information on structure plane occurrences obtained by the DPBCS is inaccurate. In the magnetic mine, the information could be corrected by using those instruments, such as gyro and magnetic instrument, which may get the angles affected by magnetic mine, so the information corrected is reliable.2. according to study on metallogenic theory, there are mineral source, mineral removal and mineral accumulation in process of deposit formation, so primary structure plane, which may be obtained by the DPBCS in detail, may be generated and well stored in deep vein. The information is piece wise dealt with, and global mean vector be got in each section; so the information be effectively used to avoid structure plane concentration in the whole borehole for determining extension direction of vein. The globe mean vector is used as a representative occurrence of in each section, which is used to study extension direction of vein between the drillings, so the overall extension direction of deep vein will be determined after each section is analyzed and counted.In summary, the dissertation offers a new method to obtain the reliable structure plane occurrence information with using the DPBCS, the gyro and magnetic instrument. These equipments could get the angle affected by magnetic mine in borehole, which is used to correct the occurrence information obtained by the DPBCS. The reliable information is piece wise dealt with and studied extension direction of vein in each section between the drillings for determining the overall extension direction of deep vein. The dissertation takes Shapinggou molybdenum mine (non-magnetic ore) in Jinzhai county and quartz magnetite (magnetic ore) in Huoqiu county Anhui Province, which provides different test environments, as example to exert above method that provides some guidance in judging the extension direction of vein.