Magnetotellurics surveys

Abitibi Geophysics is now offering Magnetotellurics (MT) and Audio-frequency MT (AMT) Surveys in partnership with Zonge International. These surveys and imaging techniques use naturally occurring ionospheric current sheets and lightning storms as a source for measuring magnetotelluric signals on the earth’s surface through grounded dipoles and magnetic field antennas. This data is used to map geologic structures to great depths by combining measurements of the earth’s electric and magnetic field over a wide band of frequencies.  

Applications in mineral exploration: 

  • Identification of systems that produce conductive metals such as copper, gold, silver, lithium, and uranium. 

  • Mapping of geological structures and features such as faults, fractures, and folds. 

  • Planning of drilling programs by providing information about the depth and location of potential mineral deposits, which can reduce exploration costs. 

  • Deep structure investigation – from 50 m to several km  

It is useful for mapping the 50 m – to several 10s km depth range. 

Provides much deeper information than other resistivity methods. 

Factors determining resistivity include rock or sediment porosity, pore fluids, and the presence of certain mineral assemblages. 

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Find out more by readint this case study on mapping of closed-basin lithium-bearing brines using Magnetotellurics.

Discover our Controlled-source Audio - Magnetotellurics (CSAMT) surveys.

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