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Three-dimensional electrical exploration methods for the mapping of polymetallic targets in Gansu Province, ChinaNormal access

Authors: S. Gong, Y. Yang, P. Lin, W. Wu, C. Zheng, F. Shi, X. Wu, A. Weng, G. Zhang, G. Gu and Y. Ye
Journal name: Geophysical Prospecting
Issue: Vol 67, No 7, September 2019 pp. 1929 - 1947
DOI: 10.1111/1365-2478.1278
Organisations: Wiley
Language: English
Info: Article, PDF ( 14.53Mb )

Summary:
We describe a three-dimensional electrical exploration system, and its use in carrying out a three-dimensional survey on a polymetallic deposit located in China’s Gansu Province. A time-domain-induced polarization method, along with a controlled-source audiomagnetotelluric method, was used to survey the same station points for comparison. Then, a three-dimensional inversion based on the incomplete Gauss–Newton method (for time-domain-induced polarization) and a nonlinear conjugate gradient (for controlled-source audiomagnetotelluric) method were developed and applied in order to model the data sets. Four subsurface targets were mapped by the three-dimensional electrical exploration method. A strong correlation was found between the zones of the revealed ore-bearing anomalies and the geological setting. Using the results of the three-dimensional electrical exploration, we revealed the spa-tial distribution of the ore-bearing stratum, as well as the relationship between the ore bodies and the stratum. The results potentially provided evidence for future inter-pretations of deep geological structures, along with evaluations of mineral resources.

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