Many countries have significant coverage of publiclyfunded airborne magnetic and gamma-ray spectrometricsurveys that are available to explorers as precompetitiveinformation to encourage exploration. However, individualsurveys are generally small, and after decades of data acquisition,explorers are faced with the problem of how to effectivelycombine the individual surveys into coherent regionalcompilations. The Australian government’s response was tofly a baseline survey over the whole of Australia atapproximately 75-km flight line spacing. This has enabledall of Australia’s public-domain magnetic and gamma-rayspectrometric surveys to be leveled to common datums usingnew techniques facilitated by the baseline control providedby the new traverses. This adds significant value to thesedata, as they can now be used for the interpretation ofregional-scale features and for direct comparison of geophysicalsignatures from different parts of the continent. Also,quantitative modeling and analysis of the data can now becarried out over much larger areas.
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