Comprehensive Research On Underground Hydrogeologic Conditions Of Jiangliyuan Iron

Mines of complicated hydrogeologic conditions generally have the characteristic ofcomplex deposits water-filling path, close hydraulic relation between differentwater-filling sources, thus bringing difficulty to determine water yield of mine, thisaffects not only the design of mine drainage scheme directly, but also the scheme of safemining. Therefore, for this type of mines, comprehensive research on undergroundhydrogeology is of great significance to safety of mine production and reasonableexploitation of mining resources.Jiangliyuan Iron is a contact metasomatic-hydrothermal iron deposit, orebodies occurin the contact zone of Ordovician carbonatite and diorite porphyry, ore deposits aredivided into two parts by F1fault, the upper orebodies have been put into operationwith sound enhancement and drainage system being built. In mining of the lowerorebodies, extending upper roadway lanes are designed reaching lower orebodiesthrough F1fault, and existing drainage and enhancement system are utilized. Thisresearch mainly focuses on hydro-geologic characteristics of fault and water yield ofmine prediction of lower orebodies.The research indicates that： as a water-conductive normal fault, F1fault (angle80~85°) is nearly vertical. Its width of fault zone amounts to0.25m~6.95m. Under thecondition of exploitation, both sides of faults have close groundwater hydraulicconnection, breccia inside shallow fault zone are cemented by clay minerals whilebreccia inside deep-seated fault zone are cemented by micritic calcite, and thewater-conductive ability of shallow fault is superior than that of deep-seated fault.Rocks in the vicinity of fault are smashed and have poor stability, thus affecting theformulation of mining scheme.Based on hydrogeologic conditions of diggings, this paper established hydrogeologicconceptual model and numerical model, the predicting maximum value of water yield ofmine of lower orebodies reached to5670m3/d by numerical method, and water yield ofmine gradually deceased with exploitation of deposits. Accuracy of prediction resultsthrough numerical method is high and provide basis for design of mine drainagetherefore.