This new ZTEM system relies upon the naturally occurring electromagnetic fields created by worldwide thunderstorms as the source of the primary electromagnetic field. The interaction between this primary field and the varying electrical properties of sub-surface rocks result in anomalous fields which are measured. The lower frequencies of the primary field penetrate much deeper than more conventional electromagnetic systems allowing the search for deep seated, large zones of elevated conductivity. This elevated conductivity may be indicative of areas of base metal mineralization.
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