The Very Low Frequency Electromagnetic VLFEM method which enables surveying without contact with the ground is suitable for ground surveys in a wide area and has been used in mapping geology and in mineral exploration for decades...We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment. which can crush all kinds of metal and non-metallic ore, also can be dry grinding and wet grinding.If you are interested in our products or want to visit the nearby production site, you can click the button below to consult us.Welcome to our factory to test machine for free!
Cite Work The Very Low Frequency Electromagnetic VLFEM method which enables surveying without contact with the ground is suitable for ground surveys in a wide area and has been used in mapping geology and in mineral exploration for decades The technique makes use of signal radiation from military navigation radio transmitters operating in the frequency range of 1530 kHzFurther Details
Very LowFrequency VLF Method The depth of exploration is limited to about 60 to 70 of the skin depth of the surrounding rock or soil Therefore the high frequency of the VLF transmitters means that in more conductive environments the exploration depth is quite shallow for example the depth of exploration might be 10 to 12 m in 25Further Details
Sep 01 2018 · VLF EM method has been applied successfully to map the resistivity contrast at boundaries of fractured zones having a high degree of connectivity Parasnis 1973 and yields a higher depth of penetration in hard rock areas because of their high resistivityFurther Details
VLF survey methods use verylowfrequency radio communication signals to determine electrical properties of shallow bedrock and nearsurface soils primarily as a reconnaissance tool VLF profiles can be run quickly and inexpensively to identify anomalous areas warranting further investigation by other surveys drilling or samplingFurther Details
35 The Very Low Frequency VLF method Slingram and ground conductivity meters are near field methods VLF technique is a far field method The source of the VLF method is electro magnetic radiation generated in the low frequency band of 1525 kHz byFurther Details
31 VLF EM Surveys The simplest EM technique is VLF EM For VLF very low frequencyEM the transmitters are operated for communication purposes by the United States and other countries for communication with their submarines The frequencies are typically at around 20 kilohertz KHz In terms of radio transmission this is a very low frequencyFurther Details
Terraquest uses a proprietary method of measuring Very Low Frequency VLF EM called Matrix VLFEM to map structure The system typically responds to variations in overburden conductivity to large faults or shear zones and to graphitic formational conductorsFurther Details