Total magnetic intensity was recorded with an acceptable noise envelope of 0.2 nanoteslas. The radiometric (gamma-ray spectrometer) data were acquired with a 33 litre crystal over the full spectrum of 256 channels. The simultaneous recording of GPS elevations of the survey aircraft and the ground clearance as measured by a radar altimeter allowed the production of a digital elevation model.
AGSO applied in-field quality-control techniques that required the contractor to demonstrate the integrity of the data. Further verification checks were made during the processing phase, which included micro-leveling of data to ensure that the digital data sets would be suitable for high-quality image processing.
Images and contour maps have been produced for the various parameters recorded. These have been chosen to illustrate the main information content of the data. The various maps and images produced that are available for purchase are listed below.
An initial interpretation of the survey results has been completed by AGSO. This interpretation has allowed the refinement of the surface geological mapping of Fiji as published in various geological maps. The interpretation has also defined many previously unknown fault systems. The most significant aspect from a mineral exploration perspective is that the geophysical data identifies characteristic signatures over known epithermal gold and porphyry copper deposits and that similar signatures are recognisable in areas where no deposits have yet been discovered. The interpretation has been able to delineate the subsurface extents of various major intrusions that appear to be genetically linked to the formation of the epithermal gold and porphyry copper deposits. In many situations volcanic vent systems have been mapped overlying these intrusions. Depth to magnetic source estimates have been produced for the offshore sedimentary basins to assist with evaluation of the hydrocarbon prospectivity of these areas.
Geophysical Data Products
The results of the survey are available as a comprehensive data package, which is available from the Fiji Mineral Resources Department (MRD) in Fiji. The MRD owns the airborne geophysical data and has copyright over the Fiji data package.
The data package comprises the following products:
To purchase data contact:
Ian Fong (Director), Mineral Resources Department, Private Mail Bag, Suva, Fiji. Telephone: +679 3381 611 , Facsimile: +679 3370 039. Email: firstname.lastname@example.org.
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