TN70 : Numerical modelling of tipper data of VLF method for the detection of polluted zones related to mining operation.(Case study: Lead and zinc mine in Tash area)
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2008
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Abstarct: Mining activities and related acide drainage may couse detrimental impacts on the environment particularly in the sulphide mines. In the present research, the main goal is to consider that the environmental problems, coused by lead and zinc mining operation in Tash-Mojen area by using VLF-EM and geoelectric (resistivity and induced polarization) geophysical methods. In order to reach this target, VLF data were measured on four profiles which were perpendicular to the axis of valley in the downstream of mine, as well as VLF, resistivity and induced polarization (IP) data on one profile which was parallel to the axis of valley. Then, for the detection of probable polluted zones, the different methods were modelled numericaly to provide and interpret resistivity section by using all various information. The numerical modelling of VLF data has been performed by a computer software called INV2DVLF and the modelling of resistivity and IP data have been performed by RES2DINV software program.
This research shows that by acquiring tipper data from the field data of VLF method and suitable modelling of them, resistivity sections can be provided which are in good agreement with those of resistivity data. Studying and comparing results obtained from the used methods reveals that acide drainage emanating from the low grade waste dumps probably could have polluted considerably a vast area with a dimension of 350×(20 to 40) m2 and an approximate depth of 30 m in the downstream of the dump. These polluted zones in electric section resulted from modelling of VLF data and resistivity are detected as conductor zones. Of course, more investigations are needed for the last confirmation.
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