QMAGT – Full-Tensor Magnetic Gradiometry

QMAGT – Full-Tensor Magnetic Gradiometry

Introducing the QMAGT System

The QMAGT system is a helicopter-borne magnetic survey system which measures the magnetic field in a more robust and detailed manner. The SQUID (superconducting quantum interference device) sensor system measures the complete gradient tensor (otherwise known as full-tensor magnetic gradiometry (FTMG)) of the earth’s magnetic field. This FTMG measurement provides directional information about the magnetic field. This directional information is not available from total field sensors, which have been the industry standard for many years.

The SQUID sensors are developed by Supracon AG of Jena, Germany. Operating within a liquid helium bath, the sensors measure the magnetic field with unrivaled sensitivity. The sensor system is the result of over 20 years of development and testing, and has flown many successful exploration campaigns. The QMAGT system represents the full commercialization of this established system.

The QMAGT system is deployed in a custom-built airfoil beneath a helicopter. This ‘bird’ effectively reduces motion noise, allowing for the recovery of high quality data. As a lightweight system, the QMAGT system can be deployed in most operating environments.

QMAGT Advantages:

  • Plug and play helicopter operation for acquisition in most environments.
  • Direct determination of anomaly geometry, irrespective of whether the source is remanent or induced.
  • Better information on magnetization directions. The magnetic moment of compact sources can be directly determined.
  • Gradient measurements, particularly full tensor measurements, determine on which side of a survey line a source lies.
  • Redundant tensor components (4 of the 9 measured tensors are redundant) give inherent error correction and noise estimates.
  • Desirable mathematical properties, allowing magnetization mapping, rigorous continuation, reduction to the pole, depth slicing, invariants, etc.





SQUID sensor: 6-channel first-order planar gradiometers
Intrinsic gradient noise: <100 fT / (m√Hz)
Magnetometer: 4-channels of magnetometers
Intrinsic noise: 2 pT / √Hz
SQUID electronic bandwidth: > 3 MHz
Sampling Rate: 10,000 samples per second
Operating temperature range: -10°C to +70°C
Cryostat operation: 2.5 days per refill
Data acquisition: 20 channels of 24 bit ADCs
IMU system: 3 fibre optic gyros, 3 accelerometer sensors
Radar altimeter: max of 3 % or 0.5 m
Laser altimeter: +/- 1 to 2 cm typical
Total bird weight: 130 kg
Tow rope: DyneemaTM – 32 m +

Knowledge through innovation and resolve

Dias delivers unique geophysical solutions to geoscience challenges through the application of innovative technologies. Dias offers induced polarization and resistivity survey services using its proprietary DIAS32 system, a uniquely efficient and effective technology. Dias provides full tensor magnetic gradient survey services using the SQUID-based FTMG system in partnership with Supracon AG.


April 14, 2021

Independence Gold has plans to carry out a detailed 3D IP and MT survey on the 3Ts project using the Dias32 at the end of

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January 14, 2021

High priority gold targets associated with surface gold mineralization have been identified by Pelangio Exploration Inc. following an IP/resistivity survey completed by Dias Geophysical on their Hailstone property in Saskatchewan.

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December 28, 2020

Dias Geophysical’s 3DIP survey for Gold Bull Resources Corp. resources yielded excellent results and defined promising new drill targets on the Sandman Gold project in Nevada. This was the first 3D IP/resistivity geophysical survey that Gold Bull has completed on their property and they will continue to use this type of surveying for future targeting.

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December 17, 2018

Dias Geophysical completed a DIAS32 3D resistivity and IP survey over Declan Cobalt’s Tisová project in the Czech Republic. The property hosts polymetallic VMS mineralization

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May 30, 2018

Dias Geophysical has been operating in Australia for over 6 months, and has committed a full 3D system to the Australian market for the foreseeable

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PDAC 2021

Join us virtually for the PDAC premier mineral exploration and mining convention between March 8-11, 2021.

AMEBC Remote Roundup 2021

Join us virtually at AME’s first Remote Roundup conference from January 18-22, 2021.

CCMEC 2019

Join us in Winnipeg on November 18 and 19 at the CCMEC conference.

AMEBC Roundup 2019

Please plan to visit us at our booth at the Roundup in Vancouver from January 28 to 31.

Dias at DMEC

Please join Dias Geophysical in the exhibition hall at the DMEC conference from October 22 to 25, 2017. Dias will be sharing a booth with Supracon AG for the duration of the conference. Glenn Chubak, Dias’ VP Technology, will be co-chairing the technical session on Ground and Borehole Geophysics on Tuesday morning, and Jonathan Rudd, Dias’ president, will be speaking on the Progress of the Electrical Resistivity and IP Method, also on Tuesday morning. Dias Geophysical is a proud sponsor of the event.

PDAC 2017

Dias Geophysical is exhibiting at the PDAC Conference from March 5 to 8. Please visit our booth # 6210N in the North Convention area.

AMEBC Roundup 2017

Join us at the Roundup from January 23-26, 2017, at our booth #1519.

ASEG Conference

February 15, 2015

Stop by the Dias Geophysical booth at the ASEG conference in Perth, Australia.

AMEBC Roundup

March 1, 2015

Join Dias Geophysical at our booth at the AMEBC Roundup conference in Vancouver.

KEGS Toronto

November 11, 2014

Dias presents an overview of the DIAS32 system at the KEGS monthly meeting in Toronto.

SEG Denver

October 31, 2014

Dias presents two papers at the 3D IP and Resistivity workshop at the SEG conference in Denver.

Tech Corner

January 15, 2021

Ground magnetotelluric (MT) measurements can be easily acquired using Dias’ DIAS32 3D DCIP system. We employ advanced processing techniques using linear regression and wavelet-based event

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