We have recently applied electrical and electromagnetic methods to two environmental problems at minesites: firstly, to an acid mine drainage problem at the tailings dam of a disused pyrite mine at Brukunga, South Australia, and secondly, to the detection of any seepage from a tailings dam at the operating Ranger minesite, Northern Territory, Australia. Using these examples, we stress the importance of the use of combined methods for both measurement and interpretation of data.At the first minesite, we used a combination of direct current (DC), transient electromagnetic (TEM) and self-potential (SP) surveys to locate the source of groundwater entering the tailings dam and to map the depth to water-table over the site. At the second minesite, more extensive experimental surveys have been made with these and the induced polarization (IP) method. The surveys include the use of a 2D array of electrodes and measurements with a multichannel data acquisition system. Results of a previous airborne electromagnetic survey have been interpreted using newly-developed conductivity-depth imaging software.
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