
%0 Journal Article
%A Purss, M.B.J. 
%A Cull, J.P. 
%T B-field probes for downhole magnetometric resistivity surveys
%J Exploration Geophysics
%D 2003/12/01
%V 34
%N 4
%P 233-240
%K 
%R https://doi.org/10.1071/EG03233
%U https://www.publish.csiro.au/paper/EG03233 
%X The downhole magnetometric resistivity (DHMMR) method relies on the measurement of low-amplitude (~100 pT), low-frequency (1?4 Hz) magnetic fields arising from galvanic current flow in the Earth. Normal magnetic sensors have been used extensively in surface magnetometric resistivity (MMR) surveys, but equivalent B-field probes have not been generally available for use in standard mineral exploration drillholes. However, recent advances in magnetic sensor design have led to the manufacture of B-field probes, which provide significant advantages over the alternative TEM probes for DHMMR surveys. Synthetic and laboratory examples highlight the differences between data acquired from B-field and TEM probes. Field examples from the Flying Doctor Prospect, near Broken Hill, New South Wales, demonstrate the improved resolution achieved by using a B-field probe for DHMMR surveys. 
