Abstract
Both frequency and time-domain AEM survey systems were flown, the choice mainly dependent upon the tender contract price of a survey in a given area. The surveys were flown at a nominal flight line spacing of 200 m. Time-domain surveys were flown with fixed-wing systems, typically at a survey altitude of 120 m above terrain, using a stinger magnetometer, on-board EM transmitter and towed bird EM receiver. The frequency-domain surveys were mainly helicopter-borne, flown at a nominal altitude of 60 m above terrain, with the magnetometer and EM transmitter/receiver systems mounted on separate birds. VLF-EM was also recorded on the helicopter surveys. The results of the surveys were published on roughly 1,300 1:20,000 semi-controlled photomosaic paper maps, showing total magnetic field contours and picked EM conductor anomalies in symbolic form.
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