Abstract
This paper discusses two ways by which a conductor buried in the ground can give a secondary field in Turam prospection. First, if Turam cable is grounded at both ends, and if the ore body is long and parallel to the cable, the secondary field is produced according to the Ampère law: it decreases like 1 R and its vertical component vanishes over the apex. Much more often, and in all cases where the Turam transmitter consists of an insulated loop, the signal cornes from induced currents: the magnetic field decreases like 1 R 2 and its vertical component is maximum over the apex. However, this maximum is shifted when the cable lies too near the ore body and when the ground surface is not horizontal. Digital and analog computations allowed us to establish ten anomaly charts for various shapes of prolate inclusions.
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