Gap GeoPhysicsExploration Services

LOX DefinitionNear Surface Geophysics

Gap Geophysics’ proprietary Sub-Audio Magnetics (SAM) technique and complementary Electrical Resistivity Imaging (ERI) surveys can provide a high resolution definition of the transition from oxidized to fresh coal.

Features & Benefits

• Rapid mapping of weathered to fresh coal transition based on electrical resistivity contrast.

• Eliminates guesswork in LOX drill hole placement reducing drilling costs.

• Minimises surface environmental disturbance.• SAM technique uses purpose built high powered geophysical

transmitters designed with operator safety as the primary goal.• Multiple independent and complementary datasets acquired with

SAM survey can help define dykes, sills and faults.• SAM data acquisition is possible for every conceivable terrain

and survey size, from a variety of sensor platforms - from person carried to helicopter-borne.

• ERI high resolution 2D electrical sections can provide more than precise LOX definition - they can be used to help define faults, non-magnetic intrusives and groundwater within the survey area.

• ERI can discriminate fine-grained units from weathered to unweathered units, enhancing the geologic knowledge and improving mine planning.

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Improve efficiency & reduce drilling costs by precisely targeting your drilling for LOX definition.

Gap Geophysics Australia Pty Ltd A: 2/16 Duncan Street West End Qld 4101 | T: +61 (0)7 3846 0999 | gapgeo.com

Depth section of Resistivity model (above) showing LOX definition, as well as interpretation of the Base of Weathering and Fault mapping.

Gap Geophysics AustraliaGap Geophysics Australia offers a range of proprietary exploration techniques, with advanced instrumentation and high performance transmitters that enable greater depth of exploration and higher resolution surveys.

LOX DefinitionNear Surface Geophysics

Gap GeoPhysicsExploration Services

High definition SAM data sets; magnetics (left) and conductivity (right). Extensive lateral near surface conductors are shown in the conductivity image, and are similar to response from shallow weathered coal seams. This allows for expedited targeting for assessment by ERI.

A set of magnetic dykes are apparent in the magnetics image on the left. Both data sets are acquired simultaneously, providing additional data to assist with mine planning.

ERI

MAGNETICS CONDUCTIVITY