A version of the CHIM electro-geochemical prospecting technique that has been developed at Guilin University, China, was trialled in South Australia during August 2007 in field surveys conducted at the Challenger gold mine, at the Tunkillia gold prospect and at the Four Mile East uranium deposit. These surveys were a follow-up to previous tests of the Chinese CHIM technique conducted in South Australia in 2005 (see RB 2006/23). The field data acquisition method involves the use of simple independent dipole electrodes buried in the soil and powered by a 9 volt battery. Mobile ions drawn to the carbon electrodes are captured on specially-prepared foam coatings wrapped around each electrode. The electrodes are exhumed and the coatings removed and analysed to determine the mass of metal ions. The method relies on the leakage of ions from an ore body to the surface, whereupon the duration of current applied through the CHIM apparatus generates a potential gradient that is able to collect such ions from a larger volume of soil than would be feasible with traditional soil sampling methods. Two corresponding CHIM survey lines were completed over the projected extensions of ore shoots at the Challenger mine, and were offset less than 5 m from the 2005 CHIM trial line: however, the encouraging results previously obtained could not be repeated. Anomalies in a different set of elements to those recorded as anomalous by the previous survey correlate to individual ore shoots, however, no one element could be used to map all of the ore shoots. For one survey, the battery was not connected to the electrodes, to compare the effect of introducing this variation. The element response that was obtained for this survey is regarded as no less useful than that derived by the corresponding survey which used the conventional CHIM technique, although both result sets are quite different. The CHIM survey at Tunkillia was conducted in conjunction with a partial leach soil geochemical survey. Both methods gave broad, multi-element anomalies over the mineralisation footprint and the surrounding alteration zone. In particular, it appears that Au-Rb-Cd anomalies obtained by CHIM, and Au-Pb-Bi anomalies obtained by the partial leach digest mixture Na-pyrophosphate + cyanide, can both be used to locate the gold mineralisation. Results from the CHIM survey conducted at the Four Mile East uranium deposit were not encouraging. High CHIM uranium values did not necessarily correspond to known mineralised zones, and so CHIM is now not credited as representing an effective exploration tool at this location. Whilst overall the CHIM technique was not found to be entirely reliable, it does give superior results to those obtained from soil sample analysis in some instances. This factor alone is interesting, and it suggests that a more complete scientific understanding of the basic mechanism of the technique may eventually lead to its successful broad application.