Discovering your resources

Discovering your resources

Discovering your resources

Accurate at incredible depth

We use advanced geophysical technology that’s specifically designed to target mineral discovery of conductive sub surface anomalies such as Ni-Cu-Co sulphide deposits. Significant resources in the world’s drive for clean energy.

Finding resources within conductive sulphide

The technology we use has proven to be pivotel in enabling access to our client’s resources at an increased depth, both cost effectively and safely, allowing us to deliver on what we say we can do.

Our Services
Our Technology

GEM are Ground Electromagnetic Survey Specialists

EM provides crutial geophysical information for Explorers to define or discover prospects within their project area

During an Electromagnetic survey, an electric current is pulsed through a large transmitter loop generating a primary magnetic field. The decay of the primary field produces a secondary magnetic field with amplitude proportional to ground conductivity. Ground Electromagnetic techniques are proficient in direct detection of conductive sulfide deposits, in which large conductivity contrasts exist between the orebodies and host rocks or overburden cover. EM surveys rely on the response of the ground to variations in electric and magnetic forces where the target is moderately to highly conductive.

Using the principle of induction, EM surveys involve the generation of a primary magnetic field on and below the ground’s surface, an electric current of known frequency and magnitude. The primary field spreads and changes as it encounters conductors in the ground. The depth of penetration of an EM field depends upon its frequency and the electrical conductivity of the medium through which it is propagating.

The magnetic component of an EM field penetrating through ground induces alternating currents or “eddy currents” to flow within the conductor in the presence of a conducting orebody. The “eddy currents” generate their own secondary EM field distorting the primary field. The subsequent measuring of the response occurs as it propagates through the subsurface. The response differs in phase, amplitude, and direction. The ratio of the magnitudes of the primary and secondary currents is proportional to the terrain conductivity.

The differences between transmitted, and received EM field reveal the presence of a conductor. Providing information on its geometry and electrical properties. Conductivity and resistivity are the inverse of each other. Resistive zones will return a weak response whereas conductive zones will return a strong response. These changes are detected by receivers as data which is then processed to provide crutial information about the conducting material in terms of geometry and intensity.

The explorer’s choice

Our Clients
Our Projects

Depth of knowledge

We have a deep understanding of geophysical concepts together with quality data acquisition methods. GEM have the know-how to apply this knowledge to various geological landscapes. Enabling us, to not only meet, but often go beyond our client’s exploration expectations

Strong relationships

Our reputation is reflected in the strength of the relationships we have developed with all our clients, many of whom are long standing. We are transparent in our approach and build robust collaborative relationships with our customers to problem solve and deliver quality results.

Expert technology

GEM are focussed on bringing advanced technology to our customer’s projects in the most collaborative, planned and structured way possible. 

Finding deep discoveries

The technology we use has proven to be pivotel in enabling access to our client’s resources at an increased depth, both cost effectively and safely, allowing us to deliver on what we say we can do.

Our Services

“Working with gem is always a pleasure. Data quality and production rates are outstanding. Field crews work autonomously and proactively, with a great work ethic. Gem never fail to provide professional and reliable surveys with the latest high quality sensors. We look forward to continuing to work with gem for all our ground em needs.”

Louise L’Oste-Brown Geophysicist at Minotaur Exploration.

“I’ve been using GEM geophysics since they began in 2003 on many projects within Australia and overseas (e.g. Fiji, Vietnam, Tanzania). GEM are a well run, very reliable and responsible group and their hard-working crews consistently deliver high quality EM data with good productivity. They are able to efficiently mobilise though borders to remote sites, respect local people, and use local assistance where needed”.

Paul Mutton Consulting Geophysicist at Touchstone Geophysics.

“I have used GEM for surface and down-hole EM surveys on numerous projects around Australia over the past 10 years. The data quality and production rates have always been excellent, and GEM’s crews are consistently experienced and professional. The Jessy Deeps SQUID sensor coupled with GEM’s 100A transmitter provides an excellent combination of sensitivity and power, and at a very competitive rate. I have no hesitation in recommending GEM to explorers looking for a reliable TEM survey company”.

Kelvin Blundell Consulting Geophysicist

“I’ve utilised GEM Geophysics since their inception in 2003 on numerous mineral exploration projects within Australia and certainly have no hesitation in recommending their crews for all forms of ground/DH EM surveys. I’ve always been very impressed with crew data quality, production rates and overall consistency/reliability using the latest EM technology at often very remote exploration sites. GEM have clearly played an instrumental role in a number of major base metal discoveries I’ve been involved with as well as across the broader exploration industry”

Russell Mortimer- Consulting Geophysicist at Southern Geoscience Consultants

“I have used GEM Geophysics over many projects throughout Australia over many years. These surveys have encompassed downhole, and surface work, using fluxgates and both high and low temperature SQUIDS. In all cases the crews have provide great data quality and executed the surveys efficiently and were adaptable to each site requirement. Each of the projects I have used GEM on all have unique challenges, steep terrain, thick woodlands, soft sandy plains, equipment restrictions, the list goes on. In every situation GEM has been adaptable and practical, arriving at each job with the right tools for that task. This can only come from wealth of experience GEM Geophysics has in TEM. The team at GEM have been easy to work with, from the pre mobilisation stages, ensuring all equipment and polices were aligned with the company’s, right through to the execution stage where the field crews have been happy to host me and demonstrate their survey prowess! I wouldn’t have any hesitation recommending the GEM Geophysics team”

Mike Whitford- Chief Geophysicst

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