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1 Behn Cove Woodvale, WA 6026

Australia

Telephone : +61 (0)8 9309 9537

Fax : +61 (0)8 9309 9537

ABN : 80 129 841 505

Questions/Answers

Geophysical Imagery

Most geophysical methods involve two types of magnetic response, passive and active. A passive magnetic-field response is measured from magnetic minerals and their structural associations (magnetite, pyrrhotite). This is an effective tool in regions of high ground cover or uneven terrain. These surveys are often ground or airborne-based.

Radiometric and Satellite imagery are further passive methods measuring radioactive decay and reflected light, respectively. When an ore-body is potentially non-magnetic, it can be defined by its conductivity and/or resistivity, using an electromagnetic method. This active method uses long wires or coils with pulsed or alternating currents to generate a primary magnetic field(time or frequency domain). The primary field induces eddy currents in the ore-body (that is conductive) and its secondary field response is measured. Electromagnetic Method (EM), Induce Polarisation (IP), Resistivity and Seismic are all measured in response to an active output field.