Multichannel transient electromagnetic measurements near Cloncurry^*

Field tests of the CSIRO multichannel transient electromagnetic system were carried out at Cloncurry, Queensland, during September 1973 with the collaboration of the Bureau of Mineral Resources (BMR). This paper presents the results of the transient response measurements carried out at one of the areas investigated in the Chinaman-Celestial region. Results are compared to those obtained with the currently commercially available equipment (the Russian-made MPPO-1 unit). Five different methods for improving the signal-to-noise (S/N) ratio at late time delays are suggested, and an estimate of the measured improvement in the S/N ratio for late time delays is obtained and compared to the predicted improvement. Full details of the instrumentation and field operations are given. Finally, a summary of the results detailed in this paper is presented. These are being used to design and build a new multichannel portable instrument suitable for field experimental tests.