TN456 : Modeling and interpretation of induced polarization and resistivity data for exploration of copper ore deposits in Haftkooh area, Shahrbabak
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2014
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Abstarct: Exploration methods are divided into two categories of direct and indirect methods. Geophysical methods, are indirect exploration methods compared to the direct exploration methods, such as exploration drilling, require less cost and time although interpretation of their results is difficult. The aim of geophysical surveys is to achieve an exact image of the subsurface properties.
IP is one of the common methods and efficient in detecting of sulfide and mextallic mineralization. In this area, as the mextallic mineralization has a dissemination structure in the host rock, modeling IP has been considered as the first priority. In addition, modeling of resistivity data carried out, and then by combining the results of two methods, meaningful results can be obtained. Considering the capabilities of dipole- dipole array in reducing electromagnetic coupling effect and its good resolution, this specific array is employed for the geophysical survey with 20 meters electrod spacing.
The purpose of this research is to determine the copper mineralization limits using inverse modeling of IP and resistivity data. Considering the mineral evidences in the area, both of these methods have been used in a geophysical survey for prospecting and exploration of copper mineralization using rectangle and dipole-dipole electrode arrays along 4 line.
In this research, to determine the exact location of the ore deposite and identify the location of drilling, data the field obtain from resistivity and induced polarization survey were inverted using RES2DINV software, and as a result, the depth and dimensions of the mineralization were determined. The results of two-dimensional (2-D) modeling and interpretation of the data showed that the locations of copper mineralization could often be distinguished from high chargeability and moderate resistivity values of the locations. Therefor, the type of the copper mineralization, occurred as disseminated in the area, could be determined from these values. Considering the absence of clay and graphite and the presence of chalcopyrite, malachite and similar mextallic ores at the location of the anomalies, the causative source of the observed anomalies in the model sections are related to sulfide mineral distributions in the subsurface that has been confirmed by geological and drilling information. Moreover, some new points have been introduced for the exploration drilling program and some recommendations have been given for further investigation.
Haftkooh area is located in the southeast of Shahr Babak (Kerman province). Available information from this area is geological map, resistivity and induced polarization (IP) data, field studies such as trenches in the area and five borehole data.
Keywords:
#Induced polarization (IP) #Electrical resistivity #Inverse modeling #Sulfide mineralization #Haftkuh #RES2DINV
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
Visitor: