Company History

Gap Geophysics Australia had its origins in the Geophysical Research Institute (GRI) of the University of New England in New South Wales, Australia. Between 1980 and 1996, the GRI pioneered the development of rapid sampling magnetometer technologies and applications under the guidance of Dr John Stanley. This period saw the development of a range of sophisticated magnetometers and laid the groundwork for the development of the Sub-Audio Magnetics (SAM) technique.  SAM was the subject of a PhD project undertaken by Malcolm Cattach (now CEO of Gap Geophysics).  The GRI was commercialised in 1996 to form Geophysical Technology Limited (GTL).

During the 1990s GRI/GTL worked closely with Australian Defence Industries (ADI), which became a major user of their technologies for unexploded ordnance detection and environmental remediation projects in Australia, South East Asia, Canada and Europe. GTL also completed many UXO detection and discrimination contracts throughout the USA and South-East Asia.

During 2002, GTL merged with EXAT (Explosives and Ammunition Technologies) Pty Ltd - one of the most experienced EOD companies in Australasia and South-East Asia - to further advance the application of ultra-high definition geophysics in UXO remediation. This resulted in the formation of G-tek Australia Pty Ltd which soon became the largest EOD operation in Australia.

In 2005, Geophysical Technology Limited went through a major restructure.  GTL's Intellectual Property and digital instrumentation were acquired by Gap Geophysics Pty Limited. G-tek Australia has continued its focus on UXO remediation.  

Gap Geo's focus is the ongoing development of its technologies and the provision of equipment and services to the exploration, environmental and UXO markets worldwide. Gap Geo's clients include many of the world’s largest mining companies and the Company is currently commercialising its patented Sub-Audio Magnetics (SAM) technology in the mineral exploration market.


Gap Geophysics is owned by a dedicated team of geophysicists and engineers who are committed to their profession and to providing the best possible geophysical solutions to their clients.

Company Name

The name of the company "Gap" is derived from the location of the original office of the company in Brisbane. "The Gap" is a suburb to the west of Brisbane, named after its situation in the gap between Mt. Cootha and Enoggera Hill in the Taylor Range. The Head Office is now located in West End. (View Map)