Economic ores usually consist of some combination of semiconductor sulfide minerals that respond to applied electric and electromagnetic fields. Consequently, electric and electromagnetic methods are the main exploration tools to locate the sulfide minerals. Models obtained from two- or three-dimensional inversion of induced polarization (IP) or controlled source audio-magnetotellurics (CSAMT) data can provide a good description of orebodies (Basokur et al., 1997). However, these methods are cumbersome in field procedures, survey costs are relatively high, and acquisition systems are expensive. For these reasons, they are not suitable for reconnaissance surveys and for exploration of small targets. The very low frequency...

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