The results of recent mineral exploration in
the Yuele lead-zinc mining area of Daguan County, northeastern Yunnan province,
showed that there are much early Paleozoic strata under thick late Paleozoic strata
in northeastern Yunnan province, where developed some hidden salt structures (SSs),
often with lead-zinc polymetallic mineralization varying degrees along the tension
torsional fault (belts) or fracture (joint). The ore-bodies belong to the epigenetic
hydrothermal filling vein-type deposit, and the prospecting potential is great.
In this area, the superficial mineralization information displayed clear, but the
deep mineralization is unknown, so the exploration work is restricted. The audio-megnetotelluric
(AMT) surveying is an advantageous method to characterize the size, resistivity
and skin depth of the polarizable mineral deposit concealed beneath thick overburden.
This paper presents the surveying results using AMT method to evaluate the concealed
lead-zinc mineralization in Yuele lead-zinc ore field, Daguancounty, NE Yunnan province,
China. After comparing the interpretation result of AMT surveying data with the
geological data and the drilling data, it is found that there is some distinct difference
in resistivity and polarizable between ore-bodies hosted strata, upper strata and
gypsum strata. The results show that AMT method is helpful to identify lead-zinc
mineralization under this geological condition.