Abstract
During prospecting work with EM equipment annoying disturbances due to extraneous signals have been observed in recent years. The source of these signals was found to be strong, very low frequency (VLF) radio-transmitters situated around the world. In 1963–1964 the Geological Survey of Sweden carried out some field studies in order to investigate the possibility of utilizing the VLF-radio signals for ore prospecting. Determinations of the amplitude, inclination and bearing of the radio field were made at two frequencies: 16,0 and 17,8 kc/s, along profiles across known ores. The depth penetration was examined by observations under ground in a copper ore mine at Adak and in the Kirunavaara iron ore mine. The results obtained show clearly that VLF radio signal measurements can be succesfully used for prospecting with as well ground-based as airborne instruments.
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