LANDTEM™ in action in Canada connected to a Crone receiver.
Locating the ore others miss
CSIRO’s LANDTEM™ is helping unearth large mineral deposits worth hundreds of millions of dollars.
15 April 2008 | Updated 15 March 2013
Deeply buried deposits of minerals such as nickel, gold and silver are of great interest to the mineral industry because most ore found to date has been on or just below the surface.
However, these deposits can be hard to find because conventional coil magnetic sensors are not sensitive enough.
In Australia, exploration for these minerals is even more difficult because the overburden (material above the deposit) is often highly conductive.
CSIRO’s LANDTEM™ is a highly portable exploration tool which can spot the difference between ore and conductive overburden, even when the ore body is deeply buried. LANDTEM™ uses highly sensitive magnetic sensors known as SQUIDs (Superconducting QUantum Interference Devices).
LANDTEM™ is helping unearth large deposits of nickel sulphide and silver worth hundreds of millions of dollars. It has also:
found several previously undetected large nickel sulphide deposits in Western Australia
cut exploration costs by 30 per cent to a company working in difficult terrain in northern Quebec in Canada
clarified coil system data at BHP Billiton’s Cannington silver mine in Queensland.
Developed in collaboration with Canadian mining company Falconbridge, LANDTEM™ is now made under license by Australian company Outer-Rim Exploration Services.
In the first commercial sale of a SQUID-based system for mineral exploration, Canadian company Crone Geophysics recently bought two LANDTEM™ systems for use in North America.
LANDTEM™ may be used with either a single channel receiver, such as Crone's 25-bit receiver, or a three channel receiver, such as Electromagnetic Imaging Technology's 16-bit SMARTem receiver.
LANDTEM™ accurately measures the magnetic (B) field, rather than the rate of decay of induced eddy currents used by conventional coil systems.
direct measurement of the B-field
sensor systems with up to three axes
electronic, auto-tuned SQUID sensors
liquid nitrogen coolant (one litre gives over ten hours operation)
low noise (white noise floor approximately 350fT/ Hz
excess noise corner less than 40Hz.
Read about Three-dimensional mineral mapping made easy.