3-D geophysical modeling using 2-D acquisitioned data and geostatistics for Yazd, Ali-Abad copper deposit to propose optimal drilling location

Document Type : Original Article

Authors

1 Faculty member of Arak University of Technology

2 MSc. Student of Arak University of Technology

Abstract

In Aliabad copper deposit located in Taft city of Yazd province, 1666 magnetic data points as well as resisitivity and induced polarization through rectangular configuration and along four profiles have been surveyed. In the present research, first, 2-D smooth inverse modeling of resistivity and chargeability data for four profiles was carried out by least squares error method using Res2dinv software. Afterward, the operations of processing, comparison and analysis of magnetis, resistivity and chargeability data from the geophysical profiles was performed and their relationship with mineralization was determined. The results show that in general there is a good accordance between magnetic and geoelectric data and the anomalies in the area are often related to metallic mineralizations. Then, to achieve the spatial structure governing on resistivity and chargeability data of the region, strike variograms were drawn in two horizontal directions of north-south and east-west as well as vertical (depth) direction. The results revealed that all theoric variogram models according to experimental variograms are spherical type and the region has geometric anisotropy. In the next step, based on the results of variography operation, 3-D models of resistivity and chargeability data were produced using Rockworks software through interpolation algorithm of advanced inverse distance weighted. At the end, on the basis of 3-D performed modeling the position of the most promissing and appropriate mineralization area was determined as well as drilling of a vertical exploratory borehole with the length of 80 m was proposed in this location.

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